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      피스톤 링과 원형 미세공이 가공된 실린더 라이너의 유체윤활해석

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      Friction loss occurring between a piston ring and a cylinder liner is most of thai in an internal combustion engine. Recently, the surface texturing technique to generate micro-dimples on a cylinder liner has been used in order to decrease friction loss and increase the efficiency of an engine. In this study, the effect of micro-dimples on the hydrodynamic lubrication characteristics between a piston ring and a micro-dimpled cylinder liner is analyzed numerically. Elrod's cavitation algorithm which implements JFO oil rupture / reformation boundary condition is adopted in order to predict the cavitation region and calculate the pressure distribution between a piston ring and a micro-dimpled cylinder liner. The depth, radius and gap of micro-dimples are considered as design parameters, and the analysis is carried out by varying those. The result shows that micro-dimples can make the minimum film thickness during the full engine cycle increase and friction loss decrease in comparison with a non-textured cylinder liner.
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      Friction loss occurring between a piston ring and a cylinder liner is most of thai in an internal combustion engine. Recently, the surface texturing technique to generate micro-dimples on a cylinder liner has been used in order to decrease friction lo...

      Friction loss occurring between a piston ring and a cylinder liner is most of thai in an internal combustion engine. Recently, the surface texturing technique to generate micro-dimples on a cylinder liner has been used in order to decrease friction loss and increase the efficiency of an engine. In this study, the effect of micro-dimples on the hydrodynamic lubrication characteristics between a piston ring and a micro-dimpled cylinder liner is analyzed numerically. Elrod's cavitation algorithm which implements JFO oil rupture / reformation boundary condition is adopted in order to predict the cavitation region and calculate the pressure distribution between a piston ring and a micro-dimpled cylinder liner. The depth, radius and gap of micro-dimples are considered as design parameters, and the analysis is carried out by varying those. The result shows that micro-dimples can make the minimum film thickness during the full engine cycle increase and friction loss decrease in comparison with a non-textured cylinder liner.

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      목차 (Table of Contents)

      • ABSTRACT
      • 1. 서론
      • 2. 해석 이론
      • 3. 해석 결과
      • 4. 결론
      • ABSTRACT
      • 1. 서론
      • 2. 해석 이론
      • 3. 해석 결과
      • 4. 결론
      • 후기
      • 참고문헌
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