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형상변화가 PEM 연료전지 개방형 양극의 유동 특성에 미치는 영향에 대한 수치해석적 연구
이재준(Jae-Jun Lee),전지아(Ji-A Jeon),송영수(Young-Su Song),김민수(Min-Su Kim),유승재(Seong-Jae You),나영승(YoungSeung Na) 대한기계학회 2018 대한기계학회 춘추학술대회 Vol.2018 No.12
Hydrogen fuel cells, which use hydrogen and oxygen to generate electricity, are receiving much attention from many industries. Researches are underway to mount them into drones. Generally, hydrogen fuel cell systems for drones are need to be lighter for flight time. Therefore, a light-weight fan is commonly used rather than a relatively heavy air compressor. However, in the case of fan, a large pressure drop in the flow path may result in air blocking in the flow path of the hydrogen fuel cell. In addition, the air flow varies depending on the position and shape of each channel inside of the hydrogen fuel cell. This flow imbalance results in an inconsistent electrochemical reaction within the fuel cell. These problems soon lead to a reduction in fuel cell performance, which directly leads to a decrease in flight time. Therefore, an analysis of the pressure drop depending on the shape of the fuel cell channels and constant distribution of the flow rate for each channel can be expected to increase the flight time. In this paper, we conducted a numerical study on the variation of flow characteristics and pressure drop depending on the shape of the channel of hydrogen fuel cell for drones.
전산 가시화를 통한 무인 항공기용 연료전지 양극 산소 유로 최적화 연구
전지아(Ji-A Jeon),이재준(Jae-Jun Lee),송영수(Young-Su Song),김민수(Min-Su Kim),김건우(Gun Woo Kim),나영승(Youngseung Na),리광훈(Gwang Hoon Rhee) 한국가시화정보학회 2019 한국가시화정보학회지 Vol.17 No.1
Numerical visualization is conducted to confirm the variation of flow characteristics and pressure drop by the shape of channels on the cathode flow path in hydrogen fuel cells for unmanned aerial vehicles(UAVs). Generally, a light-weight fan is commonly used rather than a heavy air compressor at UAVS. However, in case of blower fan, a large pressure drop in the flow path causes the blocking of the oxygen supply to the fuel cell. Therefore, the uniformity of flow inside the cathode has to be achieved by changing the shape of the cathode. The flow channel, the duct shape, and the diameter of the fan are changed to optimize the flow path. As a result, it is confirmed that the optimal flow path can decrease the velocity difference between the center and outer flow by 1.8%. However, It should be noted that the channel size can increase the pressure drop.