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자동차용 고분자연료전지 수소재순환시스템 출구 매니폴드 형상의 개선에 관한 연구
곽현주(Hyun Ju Kwag),김재춘(Jae Choon Kim),정진택(Jin Taek Chung),오형석(Hyung Seuk Oh) 한국자동차공학회 2006 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
A Study on the exit manifold improvement, which is the Hydrogen Recirculation System exit for automotive PEM Fuel Cells, is presented by using computational fluid dynamics(CFD), Generally, excess hydrogen is provided in the automotive fuel cell and, causes non-reaction hydrogen reducing automotive fuel cell efficiency. Reuse of the non-reaction hydrogen can be helpful to improve the fuel cell performance. Non-reaction hydrogen and vapor in fuel cells are mixed with new supplied hydrogen at manifold. By the way, imbalancing and pressure drop of hydrogen according to position of exit manifold are occurred. Imbalancing and pressure drop of hydrogen reduces performance of stack. Therefore, position of recycling hydrogen entrance is very important in manifold. The goal of this study is to obtain equal distribution of hydrogen and vapor and minimization of pressure drop in manifold through position improvemen of exit manifold. This study was performed based on 80KW level automotive PEM fuel cell's recycling system.
정영우(Jung, Young-Woo),박정규(Park, Jeong-Kyu),예창환(Ye, Chang-Hwan),박종진(Park, Jong-Jin),오형석(Oh, Hyung-Seuk) 한국신재생에너지학회 2007 한국신재생에너지학회 학술대회논문집 Vol.2007 No.11
Fuel cell electric vehicles (FCEVs) using hydrogen gas are zero emission vehicles, thus emission measurement for combustion vehicles is not applicable. The hydrogen gas consumption for fuel economy will be measured by the stabilized pressure/temperature method, mass flow method and electrical current method, etc. In this research, weight method with a newly manufactured test equipment is applied to measure the hydrogen consumption because above 3-methods have a deviation. The hydrogen consumption is directly calculated by the weight differences of the external hydrogen tank before and after the chassis dynamometer test. Ultimately the fuel economy for FCEVs is obtained with a deviation less than 1% in all chassis dynamometer tests.
자동차용 고분자 연료전지 수소 재순환 시스템의 이상 유동해석
곽현주(Hyun Ju Kwag),정진택(Jin Taek Chung),김재춘(Jae Choon Kim),김용찬(Yongchan Kim),오형석(Hyung Seuk Oh) 대한기계학회 2008 大韓機械學會論文集B Vol.32 No.6
The purpose of this paper is to analyze two-phase flows of the hydrogen recirculation system. Two-phase flow modeling is one of the great challenges in the classical sciences. As with most problems in engineering, the interest in two-phase flow is due to its extreme importance in various industrial applications. In hydrogen recirculation systems of fuel cell, the changes in pressure and temperature affect the phase change of mixture. Therefore, two-phase flow analysis of the hydrogen recirculation system is very important. Two-phase computation fluid dynamics (CFD) calculations, using a commercial CFD package FLUENT 6.2, were employed to calculate the gas-liquid flow. A two-phase flow calculation was conducted to solve continuity, momentum, energy equation for each phase. Then, the mass transfer between water vapor and liquid water was calculated. Through an experiment to measure production of liquid water with change of pressure, the analysis model was verified. The predictions of rate of condensed liquid water with change of pressure were within an average error of about 5%. A comparison of experimental and computed data was found to be in good agreement. The variations of performance, properties, mass fraction and two-phase flow characteristic of mixture with resepct to the fuel cell power were investigated.