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质子交换膜燃料电池(PEMFC)是一种有巨大发展潜力的发电装置,特别适合成为新一代便携式电源和电动汽车的动力源。水是影响燃料电池性能的关键因素,良好的水管理是使其安全稳定运行和提高其性能的必要条件。在PEM燃料电池的阴极侧安装风扇,向燃料电池提供氧化剂和降低电池温度,通过实验,观察到在电池堆方向发生变化的情况下,PEM燃料电池性能及其内部传质情况会发生明显变化。实验结果发现:当电流密度较小时,电极方向对PEM燃料电池的性能影响不明显;当电流密度较大时,阳极在上、阴极在下时燃料电池性能优于阴极在上、阳极在下的燃料电池性能。 相似文献
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质子交换膜燃料电池(PEMFC)可以提供较高的功率/能量密度,是未来空间探索最有前途的动力设备之一,其性能主要取决于内部反应物的传输和水管理。气体扩散层(GDL)作为燃料电池中的重要组成部件,与燃料电池的质量、水、热和电的多相传输紧密相关,是反应物和液态水的主要传输场所。因此,要提高燃料电池性能,合理的气体扩散层的设计至关重要。从提升空间燃料电池的使用寿命、稳定性及电化学性能的角度出发,综述了气体扩散层的物理化学特性,并介绍了多种改性方法,包括疏水性、结构和新型一体式GDL以及其对燃料电池性能的影响,为未来空间燃料电池高性能GDL设计提供了参考。 相似文献
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质子交换膜燃料电池是目前研究的热点之一,研究方向包括提高燃料电池效率、减少成本、提高耐久性等。作为质子交换膜燃料电池的核心部件,质子交换膜性能的好坏直接影响燃料电池的性能与寿命。文中首先概述了燃料电池质子交换膜的工作原理。随后,总结了燃料电池质子交换膜的分类,主要分为全氟磺酸质子交换膜、部分氟化聚合物质子交换膜、复合质子交换膜以及非氟化聚合物质子交换膜四大类,同时还简述了质子交换膜的制备工艺。最后,介绍了燃料电池质子交换膜的优化方案,主要包括有机/无机纳米复合质子交换膜、改进质子交换膜的骨架材料、调整质子交换膜的内部结构、机械增强型质子交换膜以及自增湿型质子交换膜。 相似文献
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质子交换膜燃料电池(PEMFC)易发生水淹、膜干等健康故障。合理的水故障诊断有助于对PEMFC内部的工作状态进行实时监测、预警并及时应对。基于气体压力降的水故障诊断方法搭建PEMFC水故障在线诊断测试平台;介绍气体压力降的理论计算方法;针对某款PEMFC堆进行阴、阳极气体压力降和电压的测试研究及分析。由于实验过程中PEMFC内部水量的变化,前1 000 s时,阴极气体压力降快速升高,阳极气体压力降缓慢升高,电压值快速下降;1 500 s后,阴、阳极气体压力降和电压值趋于稳定。该方法能实现PEMFC水故障的在线诊断。 相似文献
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质子交换膜燃料电池水热管理问题是影响电池输出性能的一个重要因素。建立了带冷却流道的三维、两相、非等温单直流道PEMFC模型,并运用计算流体力学(CFD)对燃料电池进行数值模拟,以温度、物质质量分数、膜水含量等水热管理关键因素揭示电池内部传质传热过程和电化学特性。同时研究了不同反应气体进气方式、冷却水流动方向及冷却水温度对PEMFC输出性能的影响,为燃料电池的水热管理优化、实现产业跃进式发展提供参考。结果表明:若燃料电池产物水未及时排除,阴极侧流道尾端易出现水淹现象;当PEMFC采用同向顺流或同向逆流模式时,当冷却水温度等于电池工作温度(353 K),膜温度和水含量分布较为均匀,燃料电池的输出性能较好。 相似文献
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Masatsugu Amano Hiroyuki Takazawa Tadayoshi Tanaka 《Electrical Engineering in Japan》1995,115(6):33-40
Global environmental problems, such as global warming and the effects of acid rain, are expected to become more serious in the future. One methodology for solving this problem uses harmless energy resources. Ocean energy is one of such energy resources. This research involves a study of the OC-OTEC system, which is one type of ocean thermal energy conversion technology. In this system, the steam that drives a turbine is generated in an evaporator and condenses in a condenser after passing through a turbine. However, the steam evaporating rate in an evaporator is affected by the fluctuations of surface sea water temperature and ambient pressure. Therefore, it is necessary to define the dynamic characteristics of the evaporator in order to gain constant power output. This paper presents an analysis as to how evaporation rate is affected when surface sea water temperature and ambient pressure change. Further, we clarify that the dynamic characteristics of the evaporator are more affected by fluctuations in the ambient pressure than in surface sea water temperature. 相似文献
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N. I. Vasil’ev S. V. Usatikov Yu. P. Arestenko A. S. Plotavets 《Thermal Engineering》2012,59(1):33-39
The motion velocity and heat transfer at the front of temperature wave during the changeover from a film to nucleate boiling mode as functions of heat load and mass flowrate are determined for water at atmospheric pressure and zero inlet steam quality. It is shown that the essential change of heat transfer regularities in the zone of temperature waves is satisfactorily described by linear terms of expansion into the Maclaurin series of the sink function with respect to the temperature field gradient. 相似文献
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高拱坝表孔溢流坝面短,作用水头低,堰前行进水流具有向心倾向.宽尾墩消能工应用在高拱坝泄洪表孔必须与此特点相适应.本文对宽尾墩应用在高拱坝坝顶泄洪表孔的体型布置进行了试验研究.结果表明,宽尾墩应用在高拱坝表孔时,出口角度不宜采用挑角,而应采用俯角:采用较大的宽尾墩墩尾折角有利于水流的纵向扩散和减小水垫塘底板冲击动压;同时为避免拱坝曲率造成的水流径向集中现象,两边表孔宽尾墩应采用非对称体型设计.优化后表孔水流能够在竖向及纵向充分扩散,空中呈窄而高且长的流态,在水垫塘中横向分区入水明显,不仅使水垫塘底板冲击动压减小和冲击点向下游偏移,而且为高拱坝表深孔水舌相互穿插无碰撞消能,减轻泄洪雾化创造了条件,对狭窄河谷中的高坝工程具有重要的工程应用价值. 相似文献
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河道堤坝溃决是我国易发灾害之一。溃堤将引发河道外洪水灾害和河道内水位流量的波动。现有溃堤研究多集中于应用数学模型模拟,现场观测和物理实验等直接观察获得的成果非常有限。本文通过在大型室内水槽中进行的物理模型实验,模拟了溃堤后洪水在溃口外洪泛区内的演进和落水波在河道内的传播过程。通过压力传感器阵列和声学多普勒流速仪对溃堤引发的水位、流速等变量进行了测量,并对溃堤波演变过程进行了研究。实验结果表明:(1)河道内的流速对于溃口下游洪水波的传播速度影响不大,但对溃口外水位的分布有一定的影响;(2)溃堤引发的河道内落水波在溃口上下游的影响不对称,落水波向上游传播较慢但幅度较大,而向下游传播较快但幅度较小;(3)溃堤发生后溃口流量随时间发生变化,水流稳定后溃口流量主要和上下游流量差有关,即溃口水流处于稳定分流状态。实验成果可为溃堤洪水动力学分析提供可靠的数据,为数学模型提供较为完整的验证资料,进而对河道溃堤洪水的预防和灾害控制提供科学的支撑作用。 相似文献
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Lopes I.J.S. Jayaram S.H. Cherney E.A. 《Dielectrics and Electrical Insulation, IEEE Transactions on》2001,8(2):262-268
This paper presents measurements of partial discharge (PD) from water droplets on a silicone rubber insulating surface in an ac field. Tests are done by placing droplets on the surface using a micro-pipette, and by condensing water in a controlled humidity chamber. The field enhancement factor due to droplets placed on the insulation surface is experimentally and numerically determined. Values in the range of 3.8 to 6.3 are obtained depending on the size and number of droplets. The time resolved analysis of PD from water condensation indicates a threshold field, between 3.0 and 3.5 kV/cm, above which the PD activity increases with time, and brings the insulation to a surface breakdown. The corresponding field enhancement factor obtained for the condensation experiments is between 5.8 and 6.8. The results therefore suggest that the PD activity on the hydrophobic surface can be used effectively to learn about the insulation surface conditions 相似文献
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Based on terminal measurements on a single, continuous-disc winding of a transformer, it is demonstrated how faults introduced at different positions along the winding could be localized with reasonable accuracy. Fault in the present context represents a discrete change, e.g. short-circuiting a few turns within a disc (i.e. predominantly an inductive change) and/or addition of some tens of pico-Farad capacitance between a disc and ground (i.e. predominantly a capacitive change). Open-circuit and short-circuit natural frequencies are determined by sweep frequency measurements, in addition to measuring effective resistance, shunt capacitance and inductance, at the terminals. The proposed method aims at utilizing the measured data to iteratively synthesize a lumped-parameter ladder network, corresponding to each set of measurement. Comparison of such synthesized circuits with a reference (or fault-free) circuit reveals the location, quantum, and nature of fault. Results presented demonstrate the potential of this method. 相似文献
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Fujii O. Honsali K. Mizuno Y. Naito K. 《Dielectrics and Electrical Insulation, IEEE Transactions on》2009,16(1):116-122
Observations and analyses have been conducted on the behavior of water droplets deposited on the surface of polymer insulators. As an index to characterize the repellency of water droplets on the polymer surface, the contact angle was measured for different situations. Experiments were conducted to see the behavior of water droplets of different volumes and their size distribution on silicone rubber. Electric field strength calculation was performed to analyze the effect on water droplets. Finally, effects of the Maxwell stress and the Coulomb?s force were compared, to conclude that, even if there is some true charge on the water droplet, the Maxwell stress is predominant. 相似文献
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The results from experimental studies of the dielectric premiability of dry saturated steam in the temperature range from 388 to 614 K are presented, based on which an equation for calculating this constant is proposed. 相似文献