Piston ring-cylinder bore friction modeling in mixed lubrication regime: Part I - Analytical results

Akalin O., NEWAZ G.

JOURNAL OF TRIBOLOGY-TRANSACTIONS OF THE ASME, vol.123, no.1, pp.211-218, 2001 (SCI-Expanded) identifier identifier

  • Publication Type: Article / Article
  • Volume: 123 Issue: 1
  • Publication Date: 2001
  • Doi Number: 10.1115/1.1286337
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Page Numbers: pp.211-218
  • Istanbul Technical University Affiliated: Yes


An axi-symmetric, hydrodynamic, mixed lubrication model has been developed using the averaged Reynold's equation and asperity contact approach in order to simulate frictional performance of piston ring and cylinder liner contact. The friction force between piston ring and cylinder bore is predicted considering rupture location, surface flow factors, surface roughness and metal-to-metal contact lending. A fully flooded inlet boundary condition and Reynolds boundary conditions for cavitation outlet zone are assumed. Reynolds boundary conditions have been modified for non-cavitation zones. The pressure distribution along the ring thickness and the lubricant film thickness are determined for each crank angle degree. Predicted friction force is presented for the first compression ring of a typical diesel engine as a function of crank angle position.