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연료 전지용 터보 익스펜더의 공기 포일 베어링에 대한 연구

Study on the Air Foil Bearings of the Turbo-Expander for Fuel Cell System

  • 이용복 (한국과학기술원 트라이볼로지 연구센터) ;
  • 박동진 (한국과학기술원 트라이볼로지 연구센터) ;
  • 김창호 (한국과학기술원 트라이볼로지 연구센터)
  • 발행 : 2005.06.01

초록

As fuel cell system is environmental friendly generator, its performance depends on its air supply system. Because, fuel cell stack generates electrical energy by electron and the electron is generated by reacting between air and hydrogen. So, more and more compressed air is supplied, more and more the energy can be obtained. In this study, turbo-expander supported by air foil bearing is introduced as the air supply system used by fuel cell systems. The turbo-expander is a turbo machine which operates at high speed, so air foil bearings suit its purpose for the bearing elements. Analysis for confirming the stability and endurance is conducted. Based on FDM and Newton-Raphson method, characteristics of air foil bearing, dynamic coefficients, pressure field and load capacity, are obtained. Using the characteristics of air foil bearing, the rotordynamic analysis is performed by finite element method. The analysis (stability analysis and critical speed map) shows that turbo-expander is stability at running speed. After the analysis, the test process and results are presented. The goals of test are running up to 90,000 RPM, flow rate of 150 $m^3/h$ and pressure ratio of 1.15. The test results show that the aerodynamic performance and stability of turbo-expander are satisfied to the primary goals.

키워드

참고문헌

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  5. 이용복, 김태호, 김창호, 이남수, 장건희, '공기 윤활 범프 포일 저널 베어링의 내구성 특성에 관한 연구', 윤활학회지 Vol. 18, No. 2, pp. 153-159, 2002
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피인용 문헌

  1. 회전체 동력학 및 Tribo 요소의 연구동향 vol.9, pp.1, 2005, https://doi.org/10.5293/kfma.2006.9.1.086