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基于Solidworks Flow Simulation的微流阻微开启压力止回阀设计 被引量:2
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作者 李晓波 《科技通报》 北大核心 2017年第5期98-101,共4页
针对传统止回阀存在高开启压力和高流阻的问题,设计了一种微流阻、微开启压力的止回阀。依据CAD设计图,对阀门开启压力和流阻进行了理论计算。利用Solidworks Flow Simulation软件,分析阀门分别处于75°、40°、10°工况时... 针对传统止回阀存在高开启压力和高流阻的问题,设计了一种微流阻、微开启压力的止回阀。依据CAD设计图,对阀门开启压力和流阻进行了理论计算。利用Solidworks Flow Simulation软件,分析阀门分别处于75°、40°、10°工况时的压力云图,计算出每个工况下的流量系数。结果表明,设计的阀门开启压力小、流阻系数小、流量系数大、通流能力好,能有效减小流体系统中总输送泵的能耗,达到了设计的目标。 展开更多
关键词 止回阀 微流阻 微开启压力 流体分析
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Solid-phase sintering process and forced convective heat transfer performance of porous-structured micro-channels 被引量:2
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作者 白鹏飞 易子川 +1 位作者 唐彪 周国富 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2014年第3期900-906,共7页
A solid-phase sintering process for the low-cost fabrication of composite micro-channels was developed. Three kinds of composite micro-channels with metallic porous structures were designed. The sintering process was ... A solid-phase sintering process for the low-cost fabrication of composite micro-channels was developed. Three kinds of composite micro-channels with metallic porous structures were designed. The sintering process was studied and optimized to obtain porous-structured micro-channels with high porosity. The flow resistance and heat transfer performance in the composite micro-channels were investigated. The composite micro-channels show acceptable flow resistance, significant enhancement of heat transfer and dramatic improvement of flow boiling stability, which indicates a promising prospect for the application in forced convective heat transfer. 展开更多
关键词 solid-phase sintering composite micro-channels porous structure flow resistance convective heat transfer
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Electrodeposition and Surface Characterization of Sulfur on Polycrystalline Platinum from Sulfide Polluted Brine 被引量:1
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作者 Faiza Mohamed AI Kharafi Aiman Yehia Saad Badr Ghazy Ateya Ibrahim Mohamed Ghayad 《Journal of Chemistry and Chemical Engineering》 2010年第2期15-21,共7页
This paper investigated the electrodeposition of sulfur on polycrystalline platinum from sulfide polluted brine. Anodic polarization, potentiostatic and electrochemical impedance spectroscopy (EIS) techniques were p... This paper investigated the electrodeposition of sulfur on polycrystalline platinum from sulfide polluted brine. Anodic polarization, potentiostatic and electrochemical impedance spectroscopy (EIS) techniques were performed. The slope of Warburg straight line in Nyquiest plot of the EIS spectra performed at 0.0 V indicates diffusion control mechanism of the electrodeposition process. At 0.5 V the Rp (determined from EIS measurements) increased rapidly with time indicating more sulfur deposition and more passivation of platinum surface. Samples subjected to potentiostatic experiments at 0.4, 0.9 and 1.0 V were investigated under Scanning Electron Microscope (SEM). SEM images reveal the deposition of sulfur on the sample surfaces. The degree of sulfur deposit coverage and its morphology depend on both the potential and time of deposition. 展开更多
关键词 ELECTRODEPOSITION SULFUR PLATINUM sulfide pollution.
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Fabrication of micro-flow channels on graphite composite bipolar plates using microplaning
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作者 万珍平 梁德杰 +1 位作者 陆龙生 汤勇 《Journal of Central South University》 SCIE EI CAS CSCD 2015年第8期2963-2970,共8页
A new method of manufacturing micro-flow channels on graphite composite bipolar plate(GCBPP) microplaning using specially designed multi-tooth tool is proposed. In this method, several or even dozens of parallel micro... A new method of manufacturing micro-flow channels on graphite composite bipolar plate(GCBPP) microplaning using specially designed multi-tooth tool is proposed. In this method, several or even dozens of parallel micro-flow channels ranging from 100 μm to 500 μm in width can be produced simultaneously. But, edge chippings easily occur on the rib surface of GCBPP during microplaning due to brittleness of graphite composites. Experimental results show that edge chippings result in the increase of contact resistance between bipolar plate and carbon paper at low compaction force. While the edge chippings scarcely exert influence on the contact resistance at high compaction force. Contrary to conventional view, the edge chippings can significantly improve performance of microfuel cell and big edge chippings outperform small edge chippings. In addition, the influence of technical parameters on edge chippings was investigated in order to obtain big, but not oversized edge chippings. 展开更多
关键词 microfuel cell graphite composite bipolar plate micro-flow channel microplaning edge chipping
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Effects of annealing temperature on microstructure and ferroelectric properties of Bi_(0.5)(Na_(0.85)K_(0.15))_(0.5)TiO_3 thin films 被引量:1
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作者 龚跃球 郑学军 +4 位作者 龚伦军 马颖 张大志 戴顺洪 李旭军 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2010年第10期1906-1910,共5页
Bi0.5(Na0.85K0.15)0.5TiO3(BNKT15) thin films were synthesized by metal-organic decomposition(MOD) at annealing temperatures of 650,680,710 and 740℃,and the effects of annealing temperature on the microstructure,diele... Bi0.5(Na0.85K0.15)0.5TiO3(BNKT15) thin films were synthesized by metal-organic decomposition(MOD) at annealing temperatures of 650,680,710 and 740℃,and the effects of annealing temperature on the microstructure,dielectric properties,remnant polarization(2Pr) and leakage current density were studied with X-ray diffractometer,atomic force microscope,precision impedance analyzer,ferroelectric analysis station and semiconductor parameter tester.The results show that the thin film annealed at 710℃ exhibits a typical perovskite structure without predominant orientation and a smooth surface with evenly distributed grains.2Pr value(67.4 μC/cm2 under 830 kV/cm) and the leakage current density(1.6×10-6 A/cm2 at 170 kV/cm) for BNKT15 thin film annealed at 710℃ are better than those for thin films annealed at other temperatures. 展开更多
关键词 BNKT 15 thin film metal-organic decomposition annealing temperature remnant polarization leakage current density
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Control-Based Stabilization of DC Microgrid for More Electric Aircraft
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作者 YANG Jiajun BUTICCHI Giampaolo +3 位作者 GU Chunyang WHEELER Pat ZHANG He GERADA Chris 《Transactions of Nanjing University of Aeronautics and Astronautics》 EI CSCD 2021年第5期737-746,共10页
Electrifying the on-board subsystems of aircraft becomes an inevitable process as being faced with the environmental pollution,along with the proposed concept called more electric aircraft(MEA).With the increasing num... Electrifying the on-board subsystems of aircraft becomes an inevitable process as being faced with the environmental pollution,along with the proposed concept called more electric aircraft(MEA).With the increasing number of on-board power electronic based devices,the distribution system of the aircraft can be regarded as an onboard microgrid.As it is known that the load power electronic converters can exhibit constant power load(CPL)characteristics and reduce the system stability,it is necessary to accurately predict and enhance the system stability in designing process.This paper firstly analyzes the stability of an on-board DC microgrid with the presence of CPL.Then,discusses the reasons behind instability and proposes a control strategy to enhance system stability.Finally,the simulation results are worked out to validate the analysis and the effect of the proposed control strategy. 展开更多
关键词 DC microgrid stability analysis impedance model constant power load more electric aircraft dual active bridge converter permanent magnet synchronous generator
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Drag reduction via turbulent boundary layer flow control 被引量:12
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作者 ABBAS Adel BUGEDA Gabriel +5 位作者 FERRER Esteban FU Song PERIAUX Jacques PONS-PRATS Jordi VALERO Eusebio ZHENG Yao 《Science China(Technological Sciences)》 SCIE EI CAS CSCD 2017年第9期1281-1290,共10页
Turbulent boundary layer control(TBLC) for skin-friction drag reduction is a relatively new technology made possible through the advances in computational-simulation capabilities,which have improved the understanding ... Turbulent boundary layer control(TBLC) for skin-friction drag reduction is a relatively new technology made possible through the advances in computational-simulation capabilities,which have improved the understanding of the flow structures of turbulence.Advances in micro-electronic technology have enabled the fabrication of active device systems able to manipulating these structures.The combination of simulation,understanding and micro-actuation technologies offers new opportunities to significantly decrease drag,and by doing so,to increase fuel efficiency of future aircraft.The literature review that follows shows that the application of active control turbulent skin-friction drag reduction is considered of prime importance by industry,even though it is still at a low technology readiness level(TRL).This review presents the state of the art of different technologies oriented to the active and passive control for turbulent skin-friction drag reduction and contributes to the improvement of these technologies. 展开更多
关键词 turbulent boundary layer flow control drag reduction skin-friction drag reduction
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