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Date of Publication:2008-01-01

Journal:内燃机学报

Issue:1

Page Number:69-75

ISSN No.:1000-0909

Abstract:Previous studies on lubrication and frictional performance of piston ring-liner neglected the heat conduction behavior between the piston assembly and the liner or just simplified the heat conduction process, making it away from the real lubrication and frictional characteristic. In this paper, the in-cylinder gas, the piston, the piston ring, the lubrication oil film, the liner and the coolant all included in the simulation. By considering the coupled relations of various components and the related physical fields, a 3D transient mathematical model with thermal coupled lubrication and frictional performance of piston ring-liner is proposed. The model is based on the 3D transient heat conduction model, the hydrodynamic lubrication model and the heat transfer model of lubrication oil film by considering the viscosity-temperature variation of the lubrication oil, the blow-by through the piston ring pack, the surface roughness, the rupture location and the non-axisymmetry in liner circumferential direction. The coupled analysis of the heat transfer, lubrication and friction for the ring-liner of a 6110 diesel engine is performed using the above software. The analysis obtains the temperature fields of piston assembly-liner and the validity of the coupled model is compared with the experimental results. Meanwhile, the distribution curves of the temperature, the viscosity, the minimum film thickness and the friction force of the lubrication oil film versus the crank angle and ring circumferential coordinate are obtained.

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