Numerical Simulation and Test Research of Piston Ring Dynamics

The sealing effect of piston rings in reciprocating engines has a major impact on blow-by gas and lube oil consumption.The sealing is achieved by the gas forces acting on the top and back side of the rings.Inertia forces arising from the oscillating vertical stroke and shear forces due to the secondary piston movement influence this sealing effect by a reduction in contact pressure.Numerical simulation of the piston and ring dynamics solves this non-linear problem and predicts the interaction between piston secondary motion,axial ring motion,and 2nd land pressure.This paper describes the modeling of the cylinder kit dynamics of a six-cylinder diesel engine for several operating conditions and ring modifications.A simulation method is described which predicts lube oil consumption.The influence of boundary conditions and adjustment parameters on piston ring motion and gas penetration was investigated.