New & Renewable Energy (신재생에너지)

Korean Society for New and Renewable Energy (한국신·재생에너지학회)
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Unsteady Internal Flow Analysis of a Cathode Air Blower Used for Fuel Cell System

연료전지용 캐소드 공기블로어의 비정상 내부유동장 연구

  • Jang, Choon-Man (Environmental Engineering Research Division, Korea Institute of Construction Technology) ;
  • Lee, Jong-Sung (Environmental Engineering Research Division, Korea Institute of Construction Technology)
  • Received : 2012.06.19
  • Accepted : 2012.08.09
  • Published : 2012.09.25
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Abstract

This paper describes unsteady internal flow characteristics of a cathode air blower, used for the 1 kW fuel cell system. The cathode air blower considered in the present study is a diaphragm type blower. To analyze the flow field inside the diaphragm cavity, compressible unsteady numerical simulation is performed. Moving mesh system is applied to the numerical analysis for describing the volume change of the diaphragm cavity in time. Throughout a numerical simulation by modeling the inlet and outlet valves in a diaphragm cavity, unsteady nature of an internal flow is successfully analyzed. Variations of mass flow rate, force and pressure on the lower moving plate of a diaphragm cavity are evaluated in time. The computed mass flow rate at the same pressure and rotating frequency of a motor has a maximum of 5 percent error with the experimental data. It is found that flow pattern at the suction process is more complex compared to that at the discharge process. Unsteady nature of internal flow in the cathode air blower is analyzed in detail.

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References

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