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디젤 엔진 차량의 무급유 터보차져의 성능 평가에 관한 연구

A Study on the Characteristics of the Oil-free Turbocharger for Diesel Engine Vehicles


Turbocharger has a main purpose on recycling of the exhaust gas from the engine cylinder. On the basis of the facility characteristics, the turbocharger supported on floating ring bearings has some problems such as the large volume, oil supplement for lubrication and high power loss due to high operating torque. The air foil bearing has been studied as the bearing element to be able to alternate the floating ring bearing without the problems of the floating ring bearing. In this study, the air foil bearing has 2 parts; journal and thrust bearings, and the test facility consists of the engine, exhaust and intake parts. In addiction, the specification of the turbocharger follows a small turbocharger for SUV engine. The engine speed is varied from 750 (idle rpm) to 2,500 rpm and then, the rotating speed of the turbocharger rotor is accelerated from 0 to 100,000 rpm. From those experiments, the comparison between the performances of the air foil bearing and floating ring bearing is conducted and the results show that the air foil bearing has less power loss, maximum 770 watt, than the floating ring bearing, maximum 5,110 watt. This result verifies that the air foil bearing is more efficient and able to output more power under the same condition of the input power.

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참고문헌 (11)

  1. Overview of General Machinery & Special Vehicle Headquarters Operations, Mitsubishi Heavy Industries, LTD, 2006 
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  3. C. DellaCorte and A. R. Zaldana, "A System Approach to the Solid Lubrication of Air Foil Bearings for Oil-Free Turbomachinery," Journal of Tribology, Vol.126, pp.200-207, 2004 
  4. H. Heshmat, J. F. Walton III, C. DellaCorte and M. J. Valco, "Oil-Free Turbocharger Paves the Way to Gas Turbine Engine Applications," ASME TurboExpo Conference Proceedings, ASME 2000 -GT-620, 1998 
  5. C. A. Heshmat, H. Heshmat, M. J. Valco, K. C. Radil and C. DellaCorte, "Foil Bearings Make Oil-Free Turbocharger Possible," ASME World Tribology Conference Proceedings, WTC 2005-63724, 2005 
  6. L. Y. Xiong, G. Wu, L. Q. Liu, M. F. Ling and C. Z. Chen, "Development of Aerodynamic Foil Journal Bearings for a High Speed Cryogenic Turboexpander," Cryogenics, Vol.37, No.4, pp. 221-30, 1997 
  7. Y. B. Lee, D. J. Park and C. H. Kim, "Study on the Air Foil Bearings of the Turbo-Expander for Fuel-Cell System," Journal of KSTLE, Vol.21, No. 3, pp.114-121, 2005 
  8. J. P. Peng and M. Carpino, "Calculation of Stiffness and Damping Coefficients for Elastically Supported Gas Foil Bearings," Transactions of ASME, Vol.115, pp.20-27, 1993 
  9. H. Heshmat, J. Walowit and O. Pinkus, "Analysis of Gas-Lubricated Compliant Journal Bearings," ASME Journal of Lubrication Engineering, Vol. 105, No.4, pp.647-655, 1983 
  10. S. O. Gamo, A. Rachid and M. Ouladsine, "Air Adimission Theoretical Model for A Turbocharged Diesel Engine," 1997 ASME Fluids Engineering Division Summer Meeting Proceedings, FEDSM 97-3667, 1997 
  11. S. A. Howard, "Rotordynamics and Design Methods of an Oil-Free Turbocharger," NASA CR-1999-208689, 1999 

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