Development and Application of Ring-Pack Model Integrating Global and Local Processes. Part 2: Ring-Liner Lubrication

Paper #:
  • 2017-01-1047

Published:
  • 2017-03-28
Abstract:
A new ring-pack model has been developed based on the curved beam finite element method. This paper describes the second part of this model: simulating oil transport around ring pack system by solving oil film thickness on the liner. The ring dynamics model in Part 1 calculates inter-ring gas pressure and ring dynamic twist which are used in the ring-liner lubrication model as boundary conditions. Therefore, only in-plane conformability is calculated to obtain the oil film thickness on the liner. Both global processes: bore distortion and piston tilt and local processes: bridging and oil-lube interaction are considered. Hydrodynamic pressure is calculated from deterministic correlations and asperity contact is calculated using Greenwood-Tripp model. The model is applied to a passenger car engine and a study of global and local processes is conducted and emphasis is given to local oil transport at high-load engine condition when oil consumption starts to become a problem.
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