Journal of the Korean Society for Precision Engineering (한국정밀공학회지)

Korean Society for Precision Engineering (한국정밀공학회)
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A Computational Investigation on Airflow Structures Inside a Ball Bearing at High-Speed Rotation

고속 회전하는 볼베어링 내 공기 유동구조 수치해석 연구

  • Kim, Dong-Joo (Department of Mechanical Engineering, Kumoh National Institute of Technology) ;
  • Oh, Il-Suk (Graduate School, Department of Mechanical Engineering, Kumoh National Institute of Technology) ;
  • Hong, Seong-Wook (Department of Mechatronics, Kumoh National Institute of Technology) ;
  • Kim, Kyoung-Jin (Department of Mechanical System Engineering, Kumoh National Institute of Technology)
  • 김동주 (금오공과대학교 기계공학과) ;
  • 오일석 (금오공과대학교 대학원 기계공학과) ;
  • 홍성욱 (금오공과대학교 기전공학과) ;
  • 김경진 (금오공과대학교 기계시스템공학과)
  • Received : 2011.01.06
  • Accepted : 2011.03.09
  • Published : 2011.06.01
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Abstract

In a hope to better understand the flow and convective heat transfer characteristics inside a ball bearing, air flow between the rolling elements and raceways at high speed bearing rotation is numerically investigated using a simplified inner geometry of bearing and a CFD technique. Flow simulation results reveal the pressure distribution of airflow and the shear stress distribution on the ball surface, of which nonuniformity becomes significant with the increasing rotational speed. Also, the local point of maximum shear stress coincides with the stagnation flow area on the surface of rolling elements. A complex pattern of three-dimensional vortex structures is found in the air flow due to the relative motion of bearing elements and three different types of vortex pairs exist around the rotating and orbiting rolling elements.

Keywords

References

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