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TCM-90现场科学试验台风FLO“β陀螺”“通风流”非对称动力结构特征 被引量:30
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作者 徐祥德 陈联寿 +1 位作者 解以扬 亢迪 《气象学报》 CSCD 北大核心 1996年第5期536-543,共8页
采用TCM-90台风现场科学试验期间加密观测资料,揭示出目标台风Flo非对称动力、热力结构及其转向运动的特征,尤其通过分离处理的偏差场,突出了TCM-90现场试验有关飞机下投(dropsonde)加密探测资料对台风F... 采用TCM-90台风现场科学试验期间加密观测资料,揭示出目标台风Flo非对称动力、热力结构及其转向运动的特征,尤其通过分离处理的偏差场,突出了TCM-90现场试验有关飞机下投(dropsonde)加密探测资料对台风Flo内部非对称结构物理图象的描述,提出了实际台风动力结构存在类似Gray认为的非对称偶极子型,即中低层“β陀螺”偶极子型(β-topdipole),及其“通风流”(Ventilationflow)特征,高层辐合-辐散结构的变形偶极子系统概念模型,并认为这类三维非对称结构对台风运动(转向现象)有一定“引导”作用。文中还强调了“β陀螺”偶极子非对称结构的垂直差异,并揭示了目标台风暖心结构及其热力非对称结构特征。 展开更多
关键词 β陀螺 通风流 非对称结构 台风 动力结构
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无风管喷流诱导通风系统在水面舰船装载舱的应用与探讨 被引量:4
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作者 周振宇 《船舶》 2013年第5期50-56,共7页
文章分析了现代水面舰船机库和车辆库通风系统设计的要求和特点,借鉴民用船舶滚装处所和陆用地下停车场喷流诱导通风系统的设计理念和经验,对无风管喷流诱导通风系统在舰船机库和车辆库通风系统中的应用和设计方法进行了分析探讨,为舰... 文章分析了现代水面舰船机库和车辆库通风系统设计的要求和特点,借鉴民用船舶滚装处所和陆用地下停车场喷流诱导通风系统的设计理念和经验,对无风管喷流诱导通风系统在舰船机库和车辆库通风系统中的应用和设计方法进行了分析探讨,为舰船装载舱通风系统设计提供新的设计思路。 展开更多
关键词 水面舰船 无风管喷诱导通风 机库和车辆库通风系统 应用探讨
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喷流诱导通风在地下复式汽车库中的应用
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作者 石颖 牟萌 李百萍 《山东建筑大学学报》 2006年第4期364-367,371,共5页
地下复式汽车库与普通地下汽车库的区别在于车库层高大、存车数量多。车库层高的增加会增大排烟量,存车数量的增多会增加车库通风换气量,进而加大通风、排烟管道的高度。而减小通风、排烟管道高度成为降低车库层高、减少工程造价最简捷... 地下复式汽车库与普通地下汽车库的区别在于车库层高大、存车数量多。车库层高的增加会增大排烟量,存车数量的增多会增加车库通风换气量,进而加大通风、排烟管道的高度。而减小通风、排烟管道高度成为降低车库层高、减少工程造价最简捷的方法。为解决好这两者之间的矛盾,笔者将喷流诱导通风引入地下复式汽车库的机械通风系统设计中,并从工程造价、施工方法、节省能源、空气品质等几方面对喷流诱导机械通风系统与传统通风、排烟合用系统进行比较。 展开更多
关键词 地下复式汽车库 诱导通风 机械通风系统 排烟系统
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太阳园小区地下车库喷流诱导通风系统的经济性分析 被引量:2
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作者 龚锦 刘伊 《北京建筑工程学院学报》 2002年第3期8-12,共5页
近年来喷流诱导通风系统在地下车库通风设计中得到应用。实践证明该系统空气净化效果好、造价低、运行耗电少 ,多方面优于传统风管通风系统。本文结合大型地下车库工程设计实例 。
关键词 地下车库 透导通风 组织 经济分析
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A hybrid ventilation scheme applied to bidirectional excavation tunnel construction with a long inclined shaft
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作者 YANG Wei-chao WANG Jian +3 位作者 DENG E LIU Yi-kang LUO Lu-sen YANG Jia 《Journal of Central South University》 SCIE EI CAS CSCD 2024年第9期3187-3205,共19页
The breakage and bending of ducts result in a difficulty to cope with ventilation issues in bidirectional excavation tunnels with a long inclined shaft using a single ventilation method based on ducts.To discuss the h... The breakage and bending of ducts result in a difficulty to cope with ventilation issues in bidirectional excavation tunnels with a long inclined shaft using a single ventilation method based on ducts.To discuss the hybrid ventilation system applied in bidirectional excavation tunnels with a long inclined shaft,this study has established a full-scale computational fluid dynamics model based on field tests,the Poly-Hexcore method,and the sliding mesh technique.The distribution of wind speed,temperature field,and CO in the tunnel are taken as indices to compare the ventilation efficiency of three ventilation systems(duct,duct-ventilation shaft,duct–ventilated shaft-axial fan).The results show that the hybrid ventilation scheme based on duct-ventilation shaft–axial fan performs the best among the three ventilation systems.Compared to the duct,the wind speed and cooling rate in the tunnel are enhanced by 7.5%–30.6%and 14.1%–17.7%,respectively,for the duct-vent shaft-axial fan condition,and the volume fractions of CO are reduced by 26.9%–73.9%.This contributes to the effective design of combined ventilation for bidirectional excavation tunnels with an inclined shaft,ultimately improving the air quality within the tunnel. 展开更多
关键词 bidirectional excavation tunnel inclined shaft hybrid ventilation scheme computational fluid dynamics ventilation efficiency
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地下污水处理厂扁平大空间通风技术研究与设计
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作者 班春燕 张欣 +2 位作者 桑建飞 杨国荣 邵建涛 《暖通空调》 2022年第9期36-43,共8页
针对地下污水处理厂地下箱体独有的扁平大空间特点,研发并设计了水平活塞流无管通风技术,将扁平大空间作为研究对象,通过缩尺模型实验、数值模拟、现场实测对该通风方式的气流组织特性进行了研究。发现该通风方式空气龄更短、换气效率... 针对地下污水处理厂地下箱体独有的扁平大空间特点,研发并设计了水平活塞流无管通风技术,将扁平大空间作为研究对象,通过缩尺模型实验、数值模拟、现场实测对该通风方式的气流组织特性进行了研究。发现该通风方式空气龄更短、换气效率更高、气流更均匀。并从风管布置密度、设备配置、投资及施工等方面对水平活塞流无管通风系统与传统风管式机械通风系统进行对比和分析。结果表明,前者工程量少、装机功率小、噪声低、投资小、运行能耗低、施工便捷。可为同类型地下污水处理厂通风系统设计提供参考。 展开更多
关键词 地下污水处理厂 扁平大空间 水平活塞无管通风 空气龄 缩尺模型实验
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彩色扩印机烘干装置的加热器功率、风机流率的设计
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作者 宗兴森 《感光材料》 北大核心 2000年第2期30-32,共3页
根据彩扩机的特性,相纸的特点,用工程热力学理论探讨了烘干装置的电热器功率和通风风机流率等影响相纸烘干时间及相互关系的规律。
关键词 彩色扩印机 加热器功率 烘干装置 通风
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高效低耗矿井通风机研究与选型 被引量:1
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作者 肖广成 《科技信息》 2014年第5期259-261,共3页
本文主要分析了新型节能低噪音矿井主通风机的设计、结构、控制原理及应用效果,具有较好的推广价值。
关键词 长轴矿井主通风 变频器控制 设计 选型
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空调旅客列车空气净化及增氧问题的探讨 被引量:3
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作者 赵如进 《铁道运输与经济》 北大核心 2002年第1期36-38,共3页
为解决空调旅客列车在提供旅客舒适温度的同时 ,也易造成车厢内空气严重污染的问题 ,提出通过采取“二次流双向通风节能技术”通风换气 ,臭氧、负氧离子与机械过滤技术除臭降尘灭菌以及环控增氧等技术措施 ,以解决车厢内空气净化和青藏... 为解决空调旅客列车在提供旅客舒适温度的同时 ,也易造成车厢内空气严重污染的问题 ,提出通过采取“二次流双向通风节能技术”通风换气 ,臭氧、负氧离子与机械过滤技术除臭降尘灭菌以及环控增氧等技术措施 ,以解决车厢内空气净化和青藏铁路的客车供氧问题。 展开更多
关键词 旅客列车 空调列车 空气污染 空气净化 负氧离子 机械过滤 增氧 通风换气 二次双向通风节能技术
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Simulation and analysis of airflow stability during fire in mine belt roadway 被引量:3
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作者 ZHANG Sheng-zhu CHENG Wei-min +2 位作者 LI Qiu-jin ZHANG Rui LUO Chuan-Iong 《Journal of Coal Science & Engineering(China)》 2010年第4期375-380,共6页
According to fluid dynamics analysis during the fire, the criteria k-ε two-equation model for solving three-dimensional turbulence was determined, the pollutants generated in the fire disaster were set by adopting Mi... According to fluid dynamics analysis during the fire, the criteria k-ε two-equation model for solving three-dimensional turbulence was determined, the pollutants generated in the fire disaster were set by adopting Mixture multiphase flow, and the SIMPLE algorithm was used for solving on the basis of comprehensive consideration on the heat radia- tion and components transmission during fire. By simulating the airflow flowing state inside the tunnel during fire disaster of downward ventilation, drift ventilation, and ascensional ventilation, respectively, with regard to the actual situation of No.l, No.3, and No.5 belt roadway in Kongzhuang Coal Mine, the velocity vector distributions of pollutants under different inlet air volumes were obtained, and the damage degree and influential factors of disaster were also clear, which is helpful to control and avoid disaster during belt roadway fire. 展开更多
关键词 belt roadway disaster airflow STABILITY numerical simulation
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Airflow characteristics by air curtain jets in full-scale room 被引量:6
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作者 尹海国 李安桂 《Journal of Central South University》 SCIE EI CAS 2012年第3期675-681,共7页
A new air distribution pattern,air curtain jet ventilation was presented.The ventilation or airflow patterns and the air velocity produced by air curtain jet were investigated in detail.To identify the airflow charact... A new air distribution pattern,air curtain jet ventilation was presented.The ventilation or airflow patterns and the air velocity produced by air curtain jet were investigated in detail.To identify the airflow characteristics of this novel air curtain jet ventilation system,a full-scale room was used to measure the jet velocity with a slot-ventilated supply device,with regards to the airflow fields along the vertical wall as well as on the horizontal floor zones.The airflow fields under three supply air velocities,1.0,1.5 and 2.0 m/s,were carried out in the full-scale room.The experimental results show the velocity profiles of air distribution,the airflow fields along the attached vertical wall and the air lake zones on the floor,respectively.The current experimental research is helpful for heating,ventilation and air conditioning(HVAC) engineers to design better air distribution in rooms. 展开更多
关键词 air distribution air curtain ventilation airflow fields
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Laboratory testing of a shuttle car canopy air curtain for respirable coal mine dust control 被引量:4
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作者 W. R. Reed Y. Zheng +2 位作者 M. Yekich G. Ross A. Salem 《International Journal of Coal Science & Technology》 EI 2018年第3期305-314,共10页
Canopy air curtain (CAC) technology has been developed by the National Institute for Occupational Safety and Health (NIOSH) for use on continuous miners and subsequently roof bolting machines in underground coal m... Canopy air curtain (CAC) technology has been developed by the National Institute for Occupational Safety and Health (NIOSH) for use on continuous miners and subsequently roof bolting machines in underground coal mines to protect operators of these machines from overexposure to respirable coal mine dust. The next logical progression is to develop a CAC for shuttle cars to protect operators from the same overexposures. NIOSH awarded a contract to Marshall University and J.H. Fletcher to develop the shuttle car CAC. NIOSH conducted laboratory testing to determine the dust control efficiency of the shuttle car CAC. Testing was conducted on two different cab configurations: a center drive similar to that on a Joy 10SC32AA cab model and an end drive similar to that on a Joy 10SC32AB cab model. Three different ventilation velocities were tested-0.61, 2.0, 4.3 rrds (120, 400, and 850 fpm). The lowest, 0.61 m/s (120 fpm), represented the ventilation velocity encountered during loading by the continuous miner, while the 4.3 m/s (850 fpm) velocity represented ventilation velocity airflow over the shuttle car while tramming against ventilation airflow. Test results showed an average of the dust control efficiencies ranging from 74 to 83% for 0.61 m/s (120 fpm), 39%-43% for 2.0 m/s (400 fpm), and 6%-16% for 4.3 m/s (850 fpm). Incorporating an airflow spoiler to the shuttle car CAC design and placing the CAC so that it is located 22.86 cm (9 in.) forward of the operator improved the dust control efficiency to 51%-55% for 4.3 m/s (850 fpm) with minimal impact on dust control efficiencies for lower ventilation velocities. These laboratory tests demonstrate that the newly developed shuttle car CAC has the potential to successfully protect shuttle car operators from coal mine respirable dust overexposures. 展开更多
关键词 Shuttle car Canopy air curtain DUST AIRFLOW Coal mining
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Study on the instability of airflow in mine hoisting-shaf 被引量:7
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作者 王海桥 田峰 黄俊歆 《Journal of Coal Science & Engineering(China)》 2007年第1期69-73,共5页
In order to discover the airflow pattern in mine shaft which outfitted with hoist equipment (HE), this paper set up the physical model and anatomized the piston-wind caused by hoist equipment, and researched the flo... In order to discover the airflow pattern in mine shaft which outfitted with hoist equipment (HE), this paper set up the physical model and anatomized the piston-wind caused by hoist equipment, and researched the flow field and velocity field around the hoist equipment during its moving process, and analyzed the airflow around single and couple hoist equipment as well as decisive range of piston effect and additional effect of hoist equipment to ventilation system. Research conclusion indicate that during hoist equipment movement, airflow pattern changes repeatedly because of the influence of pis-ton effect from hoist equipment, and the study of airflow stability in shaft is the foundation for the stability of ventilation in mine. 展开更多
关键词 mine shaft hoist equipment (HE) piston effect ventilation system unsteady flow
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CFD modeling of methane distribution at a continuous miner face with various curtain setback distances 被引量:10
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作者 Zhou Lihong Pritchard Christopher Zheng Yi 《International Journal of Mining Science and Technology》 SCIE EI CSCD 2015年第4期635-640,共6页
Knowledge of the airflow patterns and methane distributions at a continuous miner face under different ventilation conditions can minimize the risks of explosion and injury to miners by accurately forecasting potentia... Knowledge of the airflow patterns and methane distributions at a continuous miner face under different ventilation conditions can minimize the risks of explosion and injury to miners by accurately forecasting potentially hazardous face methane levels. This study focused on validating a series of computational fluid dynamics(CFD) models using full-scale ventilation gallery data that assessed how curtain setback distance impacted airflow patterns and methane distributions at an empty mining face(no continuous miner present). Three CFD models of face ventilation with 4.6, 7.6 and 10.7 m(15, 25, and 35 ft) blowing curtain setback distances were constructed and validated with experimental data collected in a full-scale ventilation test facility. Good agreement was obtained between the CFD simulation results and this data.Detailed airflow and methane distribution information are provided. Elevated methane zones at the working faces were identified with the three curtain setback distances. Visualization of the setback distance impact on the face methane distribution was performed by utilizing the post-processing capability of the CFD software. 展开更多
关键词 Mine ventilation Computational fluid dynamics Continuous mining face Airflow pattern Methane distribution
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Numerical simulation investigation on pressure loss of diffusion tank of axial main fan 被引量:4
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作者 WANG Hai-qiao ZOU Zu-yun +1 位作者 CHEN Shi-qiang CHEN Chong-xin 《Journal of Coal Science & Engineering(China)》 2011年第4期447-449,共3页
Based on the engineering application, the angle range of rectifying airflow unit attaching diffusion tank is from 2.5° to 7.5°. In the range of average inlet velocity of 25.0 m/s to 55.0 m/s of diffusion tan... Based on the engineering application, the angle range of rectifying airflow unit attaching diffusion tank is from 2.5° to 7.5°. In the range of average inlet velocity of 25.0 m/s to 55.0 m/s of diffusion tank, numerical simulations of diffusion tank were done. The results of numerical simulations of diffusion tank are shown as follows: ③ In cases of the inlet velocity range from 25.0 m/s to 55.0 m/s, and the angle range of rectifying airflow unit from 2.5° to 7.5°, the average value of pressure losses decreases to the minimum when the angle is 4.5°.② In cases of the inlet velocity of 35.0 m/s, the pressure loss of diffusion tank decreases to the minimum when the angle of rectifying airflow unit is 5.5°. ③ As far as there are different angles of rectifying airflow unit, pressure loss increases gradually along with the addition of inlet velocity. 展开更多
关键词 diffusion tank angle of rectifying airflow unit pressure loss
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Influence of solar wind energy flux on the interannual variability of ENSO in the subsequent year 被引量:3
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作者 HE Sheng-Ping WANG Hui-Jun +3 位作者 GAO Yong-Qi LI Fei LI Hui WANG Chi 《Atmospheric and Oceanic Science Letters》 CSCD 2018年第2期165-172,共8页
Previous studies have tended to adopt the quasi-decadal variability of the solar cycle (e.g.sunspot number (SSN) or solar radio flux at 10.7 cm (F10.7) to investigate the effect of solar activity on El Ni(n)o-S... Previous studies have tended to adopt the quasi-decadal variability of the solar cycle (e.g.sunspot number (SSN) or solar radio flux at 10.7 cm (F10.7) to investigate the effect of solar activity on El Ni(n)o-Southern Oscillation (ENSO).As one of the major terrestrial energy sources,the effect of solar wind energy flux in Earth's magnetosphere (Ein) on the climate has not drawn much attention,due to the big challenge associated with its quantitative estimation.Based on a new Ein index estimated by three-dimensional magnetohydrodynamic simulations from a previous study,this study reveals that Ein exhibits both quasi-decadal variability (periodic 11-year) and interannual (2-4 years) variability,which has rarely before been detected by SSN and F10.7.A significant interannual relationship between the annual mean Ein and subsequent early-winter ENSO is further revealed.Following high Ein,the sea level pressure in the subsequent early winter shows significant positive anomalies from Asia southward to the Maritime Continent,and significant negative anomalies over the Southeast and Northeast Pacific,resembling the Southern Oscillation.Meanwhile,significant upper-level anomalous convergence and divergence winds appear over the western and eastern Pacific,which is configured with significant lower-level anomalous divergence and convergence,indicating a weakening of the Walker circulation.Consequently,notable surface easterly wind anomalies prevail over the eastern tropical Pacific,leading to El Ni(n 展开更多
关键词 Solar wind energy flux ENSO Walker circulation
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Airflow adjustment and minimization of the air power of ventilation network 被引量:3
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作者 INOUE Masahiro YANG Wen-yu 《Journal of Coal Science & Engineering(China)》 2011年第3期237-242,共6页
It is often required to know which roadway (adjustment roadway) resistances and how much values of the resis- tances should be changed to make the airflow rates in roadways (target roadways) to certain required va... It is often required to know which roadway (adjustment roadway) resistances and how much values of the resis- tances should be changed to make the airflow rates in roadways (target roadways) to certain required values in the practice of mine ventilation. In this case, the airflow rates of the target roadways and the resistances of the roadways other than the ad- justment roadways are the given conditions and the resistances of the adjustment roadways are the solutions to be found. No straightforward method to solve the problem has been found up to now. Therefore, trial and error method using the ventilation network analysis program is utilized to solve the problem so far. The method takes long calculation time and the best answer is not necessarily obtained. The authors newly defined "airflow element" as an element of the ventilation network analysis. The resistances that satisfy the airflow requirements can be calculated straight forwardly by putting the function of the airflow element into the ventilation network analysis. The air power required for the ventilation can be minimized while meeting the airflow requirements by the advanced application of the method. The authors made the computer program fulfill the method. The program was applied to actual ventilation network and it was found that the method is very practical and the time required for the analysis is short. 展开更多
关键词 airflow adjustment mine ventilation airflow resistance OPTIMIZATION
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Relative Flow Analysis around Passing-Train in the Single-Bore Subway Tunnel with Vertical Ventilation Using Moving IBM 被引量:1
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作者 Yong-Jun Jang 《Journal of Energy and Power Engineering》 2014年第8期1482-1486,共5页
Moving IBM (immersed boundary method) is applied to analyze the relative motion of railway car flow in the single-bore subway tunnel with vertical ventilation. The tested car body is modeled by cylinder type body. T... Moving IBM (immersed boundary method) is applied to analyze the relative motion of railway car flow in the single-bore subway tunnel with vertical ventilation. The tested car body is modeled by cylinder type body. The subway tunnel is assumed to be the single-car-passing straight type (single-bore tunnel). The modeled car is relatively moved forward. On the other hand, the tunnel and vertical ventilation are fixed. The momentum equations are solved by LES (large eddy simulation) method. The initial condition of fluid in the subway tunnel is stationary. The Reynolds number is 1,500 based on the cylinder radius. The turbulent flow field in the subway tunnel and vertical ventilation shaft are to be qualitatively investigated. 展开更多
关键词 Moving IBM LES subway tunnel vertical ventilation FDS (fire dynamics simulator)
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Effect of auxiliary ventilations on diesel particulate matter dispersion inside a dead-end entry 被引量:7
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作者 Zheng Yi Thiruvengadam Magesh +1 位作者 Lan Hai Tien C.Jerry 《International Journal of Mining Science and Technology》 SCIE EI CSCD 2015年第6期927-932,共6页
Diesel particulate matter(DPM) is considered carcinogenic after prolonged exposure. This paper used computational fluid dynamics(CFD) method to study the effect of four auxiliary ventilation systems on DPM distributio... Diesel particulate matter(DPM) is considered carcinogenic after prolonged exposure. This paper used computational fluid dynamics(CFD) method to study the effect of four auxiliary ventilation systems on DPM distribution in a dead-end entry with loading operation. The auxiliary ventilation systems considered include: blower fan and tubing; exhaust fan and tubing, jet fan, and push–pull system. A species transport model with buoyancy effect was used to examine the DPM dispersion pattern with unsteady state analysis. During the 200 s of the loading operation, high DPM levels were identified in the face and dead-end entry regions. This study can be used for mining engineer as guidance to design and setup of local ventilation. It can also be used for selection of DPM control strategies and DPM annual training for underground miners. 展开更多
关键词 Diesel particulate matterComputational fluid dynamicsAuxiliary ventilationDead-end entry
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Effect of floor level slit exhaust ventilation system on distribution of house dust 被引量:1
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作者 吕阳 H.Yoshino +3 位作者 R.Takaki R.Kurihara A.Mochida H.Yonekura 《Journal of Central South University》 SCIE EI CAS 2012年第3期696-702,共7页
Based on the fact that the house dust usually falls on the ground, the floor level slit exhaust ventilation system including inlet located at the ceiling and outlet of slit exhaust installed at comer between wall and ... Based on the fact that the house dust usually falls on the ground, the floor level slit exhaust ventilation system including inlet located at the ceiling and outlet of slit exhaust installed at comer between wall and floor was considered. Experiments and simulations were performed to investigate the flow and diffusion fields that are affected by this floor level slit exhaust ventilation system. The characteristics of airflow with experiments and computation fluid dynamics (CFD) are generally similar except airflow at the location of impinging flow and the location right below the inlet. Riboflavin particles were used as the house dust. For the spatial distribution of riboflavin particles in the ventilation system before operation, due to the influence of gravity, different sizes of particles show smooth decay curve. After floor level slit exhaust ventilation system is operated, the decay rate of the particles becomes faster than that after the ventilation system is powered on, and the particles with diameter of 0.5-3.0 μm in the experimental data and calculated values show good agreement. 展开更多
关键词 house dust floor level slit exhaust riboflavin particles computational fluid dynamics
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