Microturbocharger with Air Foil Bearings for a 100-W Class Micro Power System and Improvement of Rotordynamic Performance

This article presents the experimental investigation of a microturbocharger supported on bump-type air foil bearings (AFBs) for a 100-W power generation. The microturbocharger was designed via thermodynamic cycle analyses as well as rotordynamic analyses and constructed using a centrifugal compressor and turbine with tip diameter of 10 mm. The tests for AFBs at rotating speeds up to 410 krpm driven by air showed a large subsynchronous motion at 100 Hz. However, AFBs with an additional viscoelastic film eliminated the subsynchronous response due to increased damping by the viscoelastic film. The compressor performance was evaluated numerically and experimentally.

[1]  Ivan Iordanoff,et al.  Analysis of an Aerodynamic Compliant Foil Thrust Bearing: Method for a Rapid Design , 1999 .

[2]  Brian Dykas,et al.  The Role of Radial Clearance on the Performance of Foil Air Bearings , 2002 .

[3]  S. L. Dixon,et al.  Fluid mechanics, thermodynamics of turbomachinery , 1966 .

[4]  Christopher DellaCorte,et al.  Friction and Wear Characteristics of Cu-4Al Foil Bearing Coating at 25 and 650 degree C , 2004 .

[5]  Luis San Andrés,et al.  Analysis of gas foil bearings integrating FE top foil models , 2009 .

[6]  Tae Ho Kim,et al.  Dynamic characteristics of a flexible rotor system supported by a viscoelastic foil bearing (VEFB) , 2004 .

[7]  Samuel A. Howard.  Rotordynamics and design methods of an oil-free turbocharger , 1999 .

[8]  Masayoshi Esashi,et al.  A24-042 DEVELOPMENT OF MICROMACHINE GAS TURBINE FOR PORTABLE POWER GENERATION , 2003 .

[9]  Michelle Zeszotek,et al.  Thermal Management Techniques for Oil-Free Turbomachinery Systems , 2007 .

[10]  Dominiek Reynaerts,et al.  Development of an axial microturbine for a portable gas turbine generator , 2003 .

[11]  Yu Hou,et al.  Development of aerodynamic foil journal bearings for a high speed cryogenic turboexpander , 1997 .

[12]  James F. Walton,et al.  Operation of a Mesoscopic Gas Turbine Simulator at Speeds in Excess of 700,000 rpm on Foil Bearings , 2004 .

[13]  Shigehisa Fukui,et al.  A Database for Interpolation of Poiseuille Flow Rates for High Knudsen Number Lubrication Problems , 1990 .

[14]  김승종,et al.  Micro power generating device , 2004 .

[15]  Marc Carpino,et al.  Coulomb friction damping effects in elastically supported gas foil bearings , 1994 .

[16]  Hooshang Heshmat,et al.  Performance and Durability of High Temperature Foil Air Bearings for Oil-Free Turbomachinery , 2000 .

[17]  Luc G. Fréchette,et al.  Development of a microfabricated silicon motor-driven compression system , 2000 .

[18]  H. Heshmat,et al.  Analysis of Gas-Lubricated Foil Journal Bearings , 1983 .

[19]  Jeffrey H. Lang,et al.  MICRO-HEAT ENGINES, GAS TURBINES, AND ROCKET ENGINES -THE MIT MICROENGINE PROJECT- , 1997 .

[20]  Keun Ryu,et al.  Rotordynamic characteristics of a micro turbo generator supported by air foil bearings , 2007 .

[21]  Hyun-Duck Kwak,et al.  Numerical prediction of slip flow effect on gas-lubricated journal bearings for MEMS/MST-based micro-rotating machinery , 2005 .

[22]  P. Hermel,et al.  Compliant Foil Bearings Technology and Their Application to High Speed Turbomachinery , 1993 .