DOI QR코드

DOI QR Code

Stability Improvement of the Ultra-High Speed Micro Turbocharger Supported by Air Foil Bearings

공기 포일 베어링으로 지지되는 초고속 마이크로 터보차져의 구동 안정성 향상에 관한 연구

  • 곽용석 (고려대학교 기계공학과) ;
  • 김창호 (한국과학기술연구원 에너지 메카닉스 연구센터) ;
  • 정진택 (고려대학교 기계공학과) ;
  • 이용복 (한국과학기술연구원 에너지 메카닉스 연구센터)
  • Published : 2008.07.01

Abstract

To improve the operational stability of the 100 Watts class Micro Gas Turbine, the air foil bearing with additional damping material has been investigated. The key of structure is that a viscoelastic material is coated under the top foil. The compliant foil journal bearing and thrust bearing are designed to withstand high load of vibrations at the operational speed 870,000 rpm. Test is executed in room temperature. Rotor has stably operated above 480,000 rpm. It is over 55% of the designed speed 870,000 rpm. Synchronous and subsynchronous vibrations are both well controlled. Vibration amplitude diminished over 50%. With the help of increased damping resulting from the viscoelasticity, the rotor stability of Micro turbocharger has been improved.

Keywords

Micro Gas Turbine Engine;Air Foil Bearing;Viscoelastic Material;Rotor Instability

References

  1. Alan H. Epstein, 2004, "Millimeter-scale, Micro-Electro-Mechanical Systems Gas Turbine Engines," Journal of Engineering for Gas Turbines and Power, Vol. 126. pp. 205-226 https://doi.org/10.1115/1.1739245
  2. Isomura, K. and Shuji Tanaka., 2002, "Component Development of Micromachined Gas Turbine Generators," Power MEMS 2002 Technical Digest, pp. 32-35
  3. Heshmat H, Shapiro W. and Gray S., 1982, "Development of Foil Journal Bearings for High Load Capacity and High Speed Whirl Stability," Journal of Lubrification Technology, Vol. 104, pp. 149-156 https://doi.org/10.1115/1.3253173
  4. Heshmat H., 1994, "Advancements in the Performance of Aerodynamic Foil Journal Bearings : High Speed and Load Capacity" Journal of Tribology, Vol. 116, pp. 287-295 https://doi.org/10.1115/1.2927211
  5. Keun Ryu, 2005, “A Study on the Rotordynamic Characteristics of the Micro Turbo Generator,” Master thesis, Hanyang University, Seoul, Korea
  6. Kouske Isomura, Shuji Tanaka, Shinichi Togo, Hideki Kanebako, Motohide Murayama, Nobuyoshi Saji, Fumihiro Sato, and Masayoshi Esashi, 2004, "Development of Micromachine Gas Turbine for Portable Power Generation," JSME International Journal, Series B, Vol. 47, No. 3, pp. 459-464 https://doi.org/10.1299/jsmeb.47.459
  7. Yong-Bok Lee, Tae-Ho Kim, Chang-Ho Kim, Nam-Soo Lee and Dong-Hoon Choi, 2004, "Dynamic Characteristics of a Flexible Rotor System Supported by a Viscoelastic Foil Bearing," Tribology International, Vol. 37, pp. 679-687 https://doi.org/10.1016/S0301-679X(03)00013-6

Cited by

  1. A Study on the Model of Thermal Plume Flow in the Forest Fire vol.12, pp.1, 2009, https://doi.org/10.5293/KFMA.2009.12.1.007
  2. vol.12, pp.1, 2009, https://doi.org/10.5293/KFMA.2009.12.1.076