Mark A. Theobald

Calculation of Flow in the Piston-Cylinder-Ring Crevices of a Homogeneous-Charge Engine and Comparison with Experiment

A crevice-flow model that had been published in the literature was reconstructed and used to calculate flow in the crevices between the piston, the cylinder, and the rings in a homogeneous-charge engine. The code was then modified to run interactively with a more sophisticated ring-friction model developed previously for calculation of the film thickness of lubricating oil on the cylinder liner. This paper discusses the accuracy of this crevice-flow model evaluated with engine-blowby data taken from tests on a multicylinder engine.