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Dynamic scaling characteristics of single-phase natural circulation based on different strain transformations
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作者 Jia-Ning Xu Xiang-Bin Li +3 位作者 Zhong-Yi Wang Yu-Sheng Liu De-Chen Zhang Qiao Wu 《Nuclear Science and Techniques》 SCIE EI CAS CSCD 2023年第9期128-141,共14页
To understand the dynamical system scaling(DSS)analysis theory,the applicability of DSSβ-andω-strain transformation methods for the scaling analysis of complex loops was explored.A simplified model consisting of two... To understand the dynamical system scaling(DSS)analysis theory,the applicability of DSSβ-andω-strain transformation methods for the scaling analysis of complex loops was explored.A simplified model consisting of two loops was established based on the primary and secondary sides of a nuclear reactor,andβ-andω-strain transformation methods were used to ana-lyze the single-phase natural circulation in the primary circuit.For comparison with the traditional method,simplified DSSβ-andω-strain methods were developed based on the standard scaling criterion.The strain parameters in these four methods were modified to form multiple groups of scaled-down cases.The transient process of the natural circulation was simulated using the Relap5 code,and the variation in the dynamic flow characteristics with the strain numbers was obtained using different scaling methods.The results show that both the simplified and standard DSS methods can simulate the dynamic characteristics of natural circulation in the primary circuit.The scaled-down cases in the simplified method exhibit the same geometric scaling and correspond to small core power ratios.By contrast,different scaled-down cases in the standard DSS method correspond to different geometric scaling criteria and require more power.The dynamic process of natural circula-tion can be simulated more accurately using the standard DSS method. 展开更多
关键词 Dynamical system scaling analysis β-strain transformation ω-strain transformation natural circulation
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Flow characteristics of natural circulation in a lead–bismuth eutectic loop 被引量:2
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作者 Chen-Chong Yue Liu-Li Chen +4 位作者 Ke-Feng Lyu Yang Li Sheng Gao Yue-Jing Liu Qun-Ying Huang 《Nuclear Science and Techniques》 SCIE CAS CSCD 2017年第3期97-103,共7页
Lead and lead-alloys are proposed in future advanced nuclear system as coolant and spallation target.To test the natural circulation and gas-lift and obtain thermal-hydraulics data for computational fluid dynamics(CFD... Lead and lead-alloys are proposed in future advanced nuclear system as coolant and spallation target.To test the natural circulation and gas-lift and obtain thermal-hydraulics data for computational fluid dynamics(CFD) and system code validation, a lead–bismuth eutectic rectangular loop, the KYLIN-Ⅱ Thermal Hydraulic natural circulation test loop, has been designed and constructed by the FDS team. In this paper, theoretical analysis on natural circulation thermal-hydraulic performance is described and the steady-state natural circulation experiment is performed. The results indicated that the natural circulation capability depends on the loop resistance and the temperature and center height differences between the hot and cold legs. The theoretical analysis results agree well with,while the CFD deviate from, the experimental results. 展开更多
关键词 Accelerator-driven systems Lead–bismuth EUTECTIC natural circulation CFD
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Startup scheme optimization and flow instability of natural circulation lead-cooled fast reactor SNCLFR-100 被引量:4
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作者 Wen-Shun Duan Ze-Ren Zou +1 位作者 Xiao Luo Hong-Li Chen 《Nuclear Science and Techniques》 SCIE EI CAS CSCD 2021年第11期191-200,共10页
Owing to the inherent instability of the natural circulation system,flow instability can easily occur during the operation of a natural circulation lead-cooled fast reactor,especially during the startup phase.A compre... Owing to the inherent instability of the natural circulation system,flow instability can easily occur during the operation of a natural circulation lead-cooled fast reactor,especially during the startup phase.A comprehensive startup scheme for SNCLFR-100,including primary and secondary circuits,is proposed in this paper.It references existing more mature startup schemes in various reactor types.It additionally considers the restriction conditions on the power increase in other schemes and the characteristics of lead-based coolant.On this basis,the multi-scale coupling code ATHLET-OpenFOAM was used to study the flow instability in the startup phase under different power-step amplitudes and power duration times.The results showed that obvious flow instability phenomena were found in the different startup schemes,such as the short-term backflow phenomenon of the core at the initial time of the startup.Moreover,an obvious increase in the flow rate and temperature to the peak value at the later stage of a continuous power rise was observed,as well as continuous oscillations before reaching a steady state.It was determined that the scheme with smaller power-step amplitude and a longer power duration time requires more time to start the reactor.Nevertheless,it will be more conducive to the safe and stable startup of the reactor. 展开更多
关键词 natural circulation Lead-cooled fast reactor Startup scheme Flow instability Multi-scale coupling
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Analysis of hot leg natural circulation under station blackout severe accident 被引量:2
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作者 DENG Jian CAO Xuewu 《Nuclear Science and Techniques》 SCIE CAS CSCD 2007年第2期123-128,共6页
Under severe accidents, natural circulation flows are important to influence the accident progression and result in a pressurized water reactor (PWR). In a station blackout accident with no recovery of steam generator... Under severe accidents, natural circulation flows are important to influence the accident progression and result in a pressurized water reactor (PWR). In a station blackout accident with no recovery of steam generator (SG) auxiliary feedwater (TMLB' severe accident scenario), the hot leg countercurrent natural circulation flow is analyzed by using a severe-accident code, to better understand its potential impacts on the creep-rupture timing among the surge line, the hot leg, and SG tubes. The results show that the natural circulation may delay the failure time of the hot leg. The recirculation ratio and the hot mixing factor are also calculated and discussed. 展开更多
关键词 压水堆 全场断电 严重事故 热管段 自然循环
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Theoretical investigation on the steady-state natural circulation characteristics of a new type of pressurized water reactor 被引量:1
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作者 GOU Jun-Li QIU Sui-Zheng SU Guang-Hui JIA Dou-Nan 《Nuclear Science and Techniques》 SCIE CAS CSCD 2006年第5期314-320,共7页
This article presents a theoretical investigation on the steady-state natural circulation characteristics of a new type of pressurized water reactor. Through numerically solving the one-dimensional steady-state single... This article presents a theoretical investigation on the steady-state natural circulation characteristics of a new type of pressurized water reactor. Through numerically solving the one-dimensional steady-state single-phase conservative equations for the primary circuit and the steady-state two-phase drift-flux conservative equations for the secondary side of the steam generator, the natural circulation characteristics were studied. On the basis of the pre- liminary calculation analysis, it was found that natural circulation mass flow rate was proportional to the exponential function of the power and that the value of the exponent is related to the operating conditions of the secondary side of the steam generator. The higher the outlet pressure of the secondary side of the steam generator, the higher the pri- mary natural circulation mass flow rate. The larger height difference between the core center and the steam generator center is favorable for the heat removal capacity of the natural circulation. 展开更多
关键词 核反应堆 压水堆 稳态自然循环 高度差 理论研究
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Two‑parameter dynamical scaling analysis of single‑phase natural circulation in a simple rectangular loop based on dilation transformation
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作者 Jia‑Ning Xu Xiang‑Bin Li +3 位作者 Yu‑Sheng Liu Shuai Yang De‑Chen Zhang Qiao Wu 《Nuclear Science and Techniques》 SCIE EI CAS CSCD 2022年第12期59-74,共16页
Scaling analysis is widely used to design scaled-down experimental facilities through which the prototype phenomena can be effectively evaluated.As a new method,dynamic system scaling(DSS)must be verified as a rationa... Scaling analysis is widely used to design scaled-down experimental facilities through which the prototype phenomena can be effectively evaluated.As a new method,dynamic system scaling(DSS)must be verified as a rational and applicable method.A DSS method based on dilation transformation was evaluated using single-phase natural circulation in a simple rectangular loop.The scaled-down cases were constructed based on two parameters—length ratio and dilation number—and the corresponding transient processes were simulated using the Relap5 computational code.The results show that this DSS method can simulate the dynamic flow characteristics of scaled-down cases.The transient deviation of the temperature difference and mass flow rate of the scaled cases decrease with increases in the length ratio and dilation number.The distortion of the transient temperature difference is smaller than that of the mass flow;however,the overall deviation is within a reasonable range. 展开更多
关键词 Dynamical system scaling analysis Single-phase natural circulation Transient scaling deviation Dilation transformation
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Main coolant pump resistance influence on single phase water reverse flow in the inverted U-tubes under natural circulation
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作者 WANG Chuan YU Lei 《Nuclear Science and Techniques》 SCIE CAS CSCD 2012年第6期374-379,共6页
Based on nuclear power plant(NPP) best-estimate transient analysis with RELAP5 / MOD3 code,the reactor point kinetics model in RELAP5 / MOD3 code is replaced by the two-group,3-D space and time dependent neutron kinet... Based on nuclear power plant(NPP) best-estimate transient analysis with RELAP5 / MOD3 code,the reactor point kinetics model in RELAP5 / MOD3 code is replaced by the two-group,3-D space and time dependent neutron kinetic model,and two-fluid model is replaced by drift flux model.A coupled three-dimensional physics and thermal-hydrodynamics model is used to develop its corresponding computing code,thus simulating natural circulation of single-phase flow for the PWR.In this paper,we report the forward and reverse flow distribution in the inverted U-tubes of the steam generator(SG) under some typical operating conditions in the natural circulation case, and analyze the influence of main coolant pump resistance on the forward and reverse flow distribution.The calculation results show that,the pressure drop between SG inlet and outlet plenum decreases,and the SG inlet and outlet mass flow decrease with an increased main coolant pump resistance,but net mass flux of reverse flow in inverted U-tubes,and the ratio of mass flow in all reverse flow tubes to that of main coolant pipeline increase, meanwhile,the secondary steam load is invariable in this process. 展开更多
关键词 主冷却剂泵 自然循环 单相流 压水堆 逆向流动 阻力 U型管 RELAP5
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Thermal-hydraulic stability of a natural circulation system with nuclear feedback
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作者 XuZhan-Jie ChenLi-Qiang 《Nuclear Science and Techniques》 SCIE CAS CSCD 1997年第4期208-213,共6页
ThermalhydraulicstabilityofanaturalcirculationsystemwithnuclearfeedbackXuZhanJie,ChenLiQiang,MaChangWenandWu... ThermalhydraulicstabilityofanaturalcirculationsystemwithnuclearfeedbackXuZhanJie,ChenLiQiang,MaChangWenandWuShaoRong(In... 展开更多
关键词 二相流 核反馈 自然循环系统
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Non-dimensional analysis of static bifurcation in a natural circulation loop
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作者 TONG Li-Li LI Tian-Shu LI Xiao-Yan 《Nuclear Science and Techniques》 SCIE CAS CSCD 2006年第1期61-64,共4页
The steady-state characteristics of a two-phase natural circulation loop were investigated based on the homogenous model. Transcendental equations of non-dimensional loop mass flow rate under various conditions were a... The steady-state characteristics of a two-phase natural circulation loop were investigated based on the homogenous model. Transcendental equations of non-dimensional loop mass flow rate under various conditions were also derived. The static bifurcation diagram of a two-phase natural circulation described with non-dimensional vari-ables Npch-m + was obtained. In addition, various steady-state characteristics of a natural circulation loop were ana-lyzed and discussed. These characteristics include the existence of multiple solutions under certain conditions, and the maximum mass flow rate. The authors also examined the effects of important parameters such as sub-cooling number, riser-to-heated-region length ratio, and riser-to-heated-region diameter ratio. 展开更多
关键词 静态分歧 自然循环回路 双相自然循环 非空间分析
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Analysis on natural circulation capacity of the CARR
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作者 TIAN Wenxi QIU Suizheng +3 位作者 WANG Jiaqiang SU Guanghui JIA Dounan ZHANG Jianwei 《Nuclear Science and Techniques》 SCIE CAS CSCD 2007年第3期186-192,共7页
The investigation on natural circulation (NC) characteristics of the China Advanced Research Reac- tor(CARR) is very valuable for practical engineering application and also a key subject for the CARR. In this study, a... The investigation on natural circulation (NC) characteristics of the China Advanced Research Reac- tor(CARR) is very valuable for practical engineering application and also a key subject for the CARR. In this study, a computer code was developed to calculate the NC capacity of the CARR under different pool water temperatures. Ef- fects of the pool water temperature on NC characteristics were analyzed. The results show that with increasing pool water temperature, the NC flow rate increases while the NC capacity decreases. Based on the computation results and theoretical deduction, a correlation was proposed on predicting the relationship between the NC mass flow and the core power under different conditions. The correlation prediction agrees well with the computational result within ±10% for the maximal deviation. This work is instructive for the actual operation of the CARR. 展开更多
关键词 反应堆 循环容量 计算机 编码
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Effect of steam quality on two-phase flow in a natural circulation loop
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作者 贾海军 吴少融 +1 位作者 王宁 姚思民 《Nuclear Science and Techniques》 SCIE CAS CSCD 1996年第2期81-84,共4页
Effectofsteamqualityontwo-phaseflowinanaturalcirculationloopJiaHai-Jun(贾海军);WuShao-Rong(吴少融);WangNing(王宁)and... Effectofsteamqualityontwo-phaseflowinanaturalcirculationloopJiaHai-Jun(贾海军);WuShao-Rong(吴少融);WangNing(王宁)andYaoSi-Min(姚思民)(In... 展开更多
关键词 二相流 自然环流 蒸汽质量
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Bifurcation and hysteresis phenomena in the two-phase natural circulation system
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作者 YAO Wei KUANG Bo XU Ji-jun (Department of Nuclear Power Engineering and Automation, School of Power and Anergy Engineering, Shanghai Jiaotong University, Shanghai, 200050) 《Nuclear Science and Techniques》 SCIE CAS CSCD 2001年第1期61-67,共7页
The static bifurcation of the two-phase natural circulation (TPNC) system was studied theoretically and numerically. By the DERPAR algorithm the solution diagram was calculated, which shows that the static bifurcation... The static bifurcation of the two-phase natural circulation (TPNC) system was studied theoretically and numerically. By the DERPAR algorithm the solution diagram was calculated, which shows that the static bifurcation occurs under some conditions in the TPNC systems. Also, it shows that, in a region of multiple solutions, the static instability may occur. It is defined as a region of thermal-siphon instability induced flow rate jumping. By means of the solution diagram, the stability margin can be determined in this region. Furthermore, the heat input at the peak of the solution diagram is defined as the maximum capacity Of heating load that can be used to judge the capacity of the TPNC of a given geometry topological structure. Meanwhile, it is interesting that the TPNC systems have the hysteresis phenomenon defined as thermal-siphon hysteresis. Some parametric effects related were also studied. 展开更多
关键词 沸腾水反应堆 双相自然环流系统 磁滞现象
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Mechanism of ONB based on nonequilibrium thermodynamics of natural circulation in narrow channels
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作者 ZHOU Tao LI Jingjing +3 位作者 LIU Ping SHENG Cheng HUANG Yanping XIAO Zejun 《Nuclear Science and Techniques》 SCIE CAS CSCD 2013年第6期122-131,共10页
Based on the experiment of onset of nucleate boiling(ONB)in natural circulation and the nonequilibrium thermodynamics dissipative theory,the mechanism of ONB in narrow rectangle channels of natural circulation is prop... Based on the experiment of onset of nucleate boiling(ONB)in natural circulation and the nonequilibrium thermodynamics dissipative theory,the mechanism of ONB in narrow rectangle channels of natural circulation is proposed.It points out that the onset of nucleate boiling is influenced by the degree of superheat and the special conditions of narrow channels.Under the conditions of both density difference in natural circulation and narrow rectangle channels,the prediction model of ONB in natural circulation of narrow channels based on fluctuating is established.The experimental results show that the present model can be used to predict the heat flux of ONB in narrow rectangle channels.Features of ONB in natural circulation narrow rectangle channels are as follows:heating power is the incentive of the happen of ONB;the higher the heating power is,the higher the degree of superheat is,and the earlier the ONB will appear.With the pressurizing,the appearance of ONB will be delayed.The higher the degree of supercooling is,the later the ONB appears.The ONB will happen easier when there are noncondensable gases and roughness in the channels. 展开更多
关键词 非平衡态热力学 自然循环 矩形通道 热力学机制 ONB 预测模型 核态沸腾 加热功率
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An Experimental Research of Natural Circulation Heat Transfer for PRHR Heat Exchanger in AP1000
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作者 Minghui Duan Yuzhou Chen +5 位作者 Yvfeng Lv Weiqing Li Keming Bi Wei Wang Kaiwen Du Han Wang 《Journal of Energy and Power Engineering》 2016年第9期545-554,共10页
The heat transfer characteristics of the PRHR (passive residual heat removal) HX (heat exchanger) are very important to reactor design and safety assessment of AP1000. The purpose of the present experiment was to ... The heat transfer characteristics of the PRHR (passive residual heat removal) HX (heat exchanger) are very important to reactor design and safety assessment of AP1000. The purpose of the present experiment was to obtain the natural circulation data in HX to research the heat transfer behavior. The PRHR HX was simulated by three C-type tubes with prototype sizes immerged in a cooling tank. Separate-effect tests of natural circulation in HX tubes have been performed within wide conditions which could cover the operation conditions in AP1000. The experiment provided lots of important data to indicate heat transfer phenomena of PRHR HX. The test conditions were calculated by RELAP5/MOD3.3. The calculation results agreed well with the experiment. RELAP5 could be applied with proper correlations to analyze the heat transfer in PRHR HX under the test conditions. 展开更多
关键词 PRHR HX natural circulation separate-effect tests AP1000
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The Effect of Circulation Fan on Energy Consumption in Nature Convective Refrigerator-Freezer
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作者 卢智利 丁国良 《Journal of Shanghai Jiaotong university(Science)》 EI 2007年第1期76-80,共5页
The effect of the circulation fan installed in fresh food compartment on energy consumption of natural convective refrigerator/freezers (RFs) was experimentally studied. Five different RF models with different cycles ... The effect of the circulation fan installed in fresh food compartment on energy consumption of natural convective refrigerator/freezers (RFs) was experimentally studied. Five different RF models with different cycles were tested. The experimental results showed that the energy consumption of the single-loop cycle RF increased by 2.4%~3.8%, that of the bypass two-circuit cycle RF decreased by 1.0%, and that of the two-circuit cycle RF with its evaporators in parallel when the geometry parameters of refrigeration system and the refrigerant charge were not changed after the circulation fan was installed decreased by 3.3%. When the optimization on the refrigerant charge and the evaporator was carried out, the energy consumption of the single-loop cycle RF , the bypass two-circuit cycle RF and the two-circuit cycle RF with its evaporators in parallel, decreased by 1.0%~6.4%, 3.25% and 3.26% respectively. The present conclusions will provide a guideline to the optimum design for the RF with the circulation fan. 展开更多
关键词 circulation fan household refrigerator/freezer (RFs) optimization natural convection
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“Eternal Motion” as a “Form of Movement of a Special Nature” and the Main Condition for the Creation of the Universe
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作者 Avas Khugaev Eugeniya Bibaeva 《Journal of Applied Mathematics and Physics》 2024年第6期2041-2068,共28页
The article hypothesizes that DE and DM (UCM) are a “Form of Motion of a Special Nature”, where “Form of Motion” means “Eternal Motion” as the power of dynamics of different levels and varying degrees of self-su... The article hypothesizes that DE and DM (UCM) are a “Form of Motion of a Special Nature”, where “Form of Motion” means “Eternal Motion” as the power of dynamics of different levels and varying degrees of self-sufficiency, and by “Special Nature”, gravitational and two other properties of matter, “tied” to the “Eternal Movement” and completely dependent on it. Carriers of key properties of a “Special Nature” have been established: “0”-DE particles and “3”-DM particles (UDM). The unity of their inherent “motionally-gravitational” properties and the peculiarity of the relationship between “motion” and “gravity” are revealed: the higher the intensity of “Eternal Motion”, the stronger the gravitational properties of matter are manifested (and vice versa). The relationship of “time” with the “vibration frequency” and the “mass” of photons with the “degree of bonding and deformation properties of the field” is shown. The maximum level of gravity has been determined, which allows Nature to successfully create the Universe: such a landmark is the proximity to the property of the Primary Source—the “pure graviton” of the OSP space, the most powerful “motionally-gravitational” particle of the Universe. The reasons for the emergence of such an identity of the gravitational properties of particles with the indicators of a “pure graviton” are established: for “0”-DE particles, this is the acquisition of the function of “freedom of movement”;for “3”-DM particles (UDM), the creation of a special structure—a “double field” (“Main” and “Small”). The presence in the “double field” of specific “tools” for the creation of the worlds of the Universe—gravitational “waves” gives rise to impulses (shocks) of varying intensity and shape. A list of functions performed by “waves” in the “Main” and “Small” fields has been compiled. The specific conditions for the formation of “UDM Streams”, their transformation into a “Vortex” and, under the influence of a powerful Initial Impulse (push), sending them to the “place” of the creation of galaxies, are shown. It is suggested that there is a “Cycle of Matter in Nature” in the closed structure of our Universe due to the “work” of “waves” and the functioning of special “factories” in the form of exotic space objects—Black holes. 展开更多
关键词 DE DM (UCM) Graviton Eternal motion Double Field of the Universe Motionally-Gravitational Particles Degree of Self-Sufficiency Main Field Small Field Gravitational Waves Primary Impulse Flows UDM Vortex Time Massive Photons Clumps of DM Movement of Galaxies Factories of Black Holes circulation of Matter in nature
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池式快堆一回路系统冷却剂自然循环行为研究
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作者 程道喜 张学锋 +6 位作者 杜开文 翟伟明 齐晓光 周平 于松 马晓瑶 李睿之 《原子能科学技术》 EI CAS CSCD 北大核心 2024年第9期1844-1858,共15页
为进一步认识池式快堆事故余热导出工况下冷却剂自然循环行为,建立了可视化平板水模型模拟反应堆一回路系统主要部件来开展自然循环试验,获得了堆芯、钠池以及各热交换器出口和入口的的温度响应和流场等数据。结果表明,在自然循环建立... 为进一步认识池式快堆事故余热导出工况下冷却剂自然循环行为,建立了可视化平板水模型模拟反应堆一回路系统主要部件来开展自然循环试验,获得了堆芯、钠池以及各热交换器出口和入口的的温度响应和流场等数据。结果表明,在自然循环建立的最初阶段,堆芯出口温度受冷池的影响会有一个上升较慢的过程。试验中直接观测到了通过中间热交换器和堆芯组件盒间空间的自然循环流动。同时,热池内冷流体和堆芯出口热流体的相互作用,形成了热池内局部的冷却剂流动以及能够深入到组件内部的冷热交混作用;在堆芯出口较高温度流体和独立热交换器出口较冷流体的影响下,热池内形成了温度分层界面在堆芯出口高度附近的热分层。 展开更多
关键词 池式快堆 自然循环 事故余热导出 热分层 温度脉动
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2022年NSFC心血管领域中、西医申请资助情况分析
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作者 李超 张冬梅 +6 位作者 赵京霞 耿子涵 陈澈 熊俊 何怡瀚 王蕊 毕明刚 《天津中医药》 CAS 2024年第1期130-136,共7页
系统梳理分析2022年国家自然科学基金心血管领域中、西医学面上项目、青年科学基金项目和地区科学基金项目3类常规项目的申请和资助情况、所涉及主要病种、研究热点和研究思路。结果显示,两个领域研究的主要病种相似,研究热点也基本一... 系统梳理分析2022年国家自然科学基金心血管领域中、西医学面上项目、青年科学基金项目和地区科学基金项目3类常规项目的申请和资助情况、所涉及主要病种、研究热点和研究思路。结果显示,两个领域研究的主要病种相似,研究热点也基本一致。均以动脉粥样硬化、冠心病、心力衰竭、高血压、继发性心肌损伤和心律失常为主,主要开展表观遗传学、外泌体、细胞焦亡或铁死亡、细胞自噬、肠道微生物群以及线粒体功能方面的研究,思路呈现多样化的特点。但西医心血管领域的病种更为广泛,还包括心脏移植等中医心血管领域不涉及的病种。在科学问题导向和研究内容方面,中医心血管领域要求在中医药理论的指导下,以解决中医学科的关键科学问题为导向,体现中医药的特色。此外,研究热点只是探索科学问题的技术手段,应深入凝练科学问题,避免盲目追求结合研究热点反而缺乏了创新性思想和科学依据,鼓励原创性基础研究。 展开更多
关键词 国家自然科学基金 心血管领域 中医学科 循环系统 申请与资助
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钠冷快堆关键热工水力问题研究现状及展望
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作者 杨红义 薛秀丽 +7 位作者 周志伟 林超 李虹锐 高鑫钊 余新太 马晓 肖宇白 罗锐 《原子能科学技术》 EI CAS CSCD 北大核心 2024年第9期1797-1816,共20页
钠冷快堆因其高热效率、高燃料利用率和固有安全性,以及能够实现闭式燃料循环以减少长寿命放射性废物的独特优势,被认为是第四代核能系统的首选堆型,也是目前国际核能领域的研究热点。本文概述了国际钠冷快堆及热工水力领域的发展历程... 钠冷快堆因其高热效率、高燃料利用率和固有安全性,以及能够实现闭式燃料循环以减少长寿命放射性废物的独特优势,被认为是第四代核能系统的首选堆型,也是目前国际核能领域的研究热点。本文概述了国际钠冷快堆及热工水力领域的发展历程和未来方向,并指出了当前钠冷快堆热工水力领域发展所面临的主要问题。结合我国的发展现状和挑战,本文针对热工水力研究领域的三个关键核心方面进行了深入分析:冷却剂钠的流动换热特性、堆芯热工水力分析方法,以及自然循环余热排出的设计与验证。总结了国际范围内的研究成果,分析了遇到的技术挑战和未来研究的发展趋势,并探讨了我国在这些领域的研究现状及未来的研究方向。这些分析和总结旨在为中国钠冷快堆技术在提高安全性和经济性方面的技术挑战提供指导,同时也为未来钠冷快堆的热工水力设计和优化提供重要的参考依据,以推动我国钠冷快堆技术的进一步发展。 展开更多
关键词 钠冷快堆 热工水力 自然循环 盒间流 固有安全 非能动安全 固有热工流体安全性 湍流模型
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池式钠冷快堆堆内自然循环余热排出设计研究
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作者 周志伟 薛秀丽 +3 位作者 林超 余新太 杨勇 杨红义 《原子能科学技术》 EI CAS CSCD 北大核心 2024年第9期1817-1824,I0001,共9页
基于装量功率比约为1 t/MW的较典型池式钠冷大功率快堆的堆内自然循环设计,采用ERAC程序,对两组4种不同事故余热排出系统(DHRS)输入条件下,反应堆在紧急停堆后堆内的自然循环余热排出特性进行分析。结果表明,从DHRS启用到其对堆芯产生... 基于装量功率比约为1 t/MW的较典型池式钠冷大功率快堆的堆内自然循环设计,采用ERAC程序,对两组4种不同事故余热排出系统(DHRS)输入条件下,反应堆在紧急停堆后堆内的自然循环余热排出特性进行分析。结果表明,从DHRS启用到其对堆芯产生显著冷却效应,需要较长时间,在千秒量级。在该段时间内,堆芯余热的排出依靠反应堆固有的热工流体安全特性。随后,在堆内关键温度上升到限值之前启用DHRS带出池内热量,使堆内关键温度处于下降趋势即可满足安全要求;相比将独立热交换器(DHX)布置在冷池,将其布置在热池时,热池温度及主容器壁温相对要低,这有利于主容器的温度控制,其效果要优于布置于冷池。另外,不同布置会对堆芯盒内、盒间流流量产生影响,但总体上对堆芯的冷却效应影响不大;池式钠冷快堆余热排出设计中,要充分利用固有热工流体安全特性,降低对DHRS的时效性要求。可以考虑将全部的DHX都布置在热池,并缩小设备体积、降低散热功率设计值,或在不降低安全性的前提下选用其他更经济便捷的有效方式等,以此大幅降低余热排出设备投入成本,降低反应堆运行成本,提高经济性。本文研究结果可为我国后续的商用快堆、一体化快堆等池式液态金属堆的堆内自然循环设计提供重要参考。 展开更多
关键词 大功率快堆 钠冷快堆 自然循环 余热排出 固有安全 热工流体安全特性 盒间流
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