Author(s)

K. Gavrilov, E. Zadorozhnaya, A. Doikin

Abstract

To create a modern high performance engine requires considering many design and operational factors. The working conditions of the engine tribosystems, in particular, of the piston-cylinder tribosystem are characterized by time and direction of the load (non-stationary loaded tribosystems). Moreover, they are influenced by the usage of new materials and lubricants with improved tribological properties. Non-stationarity of the piston-cylinder tribosystem combined with severe temperature conditions and a variety of factors make it difficult to create a numerical model and calculate the dynamics of the tribosystem. The paper presents a method of calculation of hydromechanical characteristics of the piston-cylinder tribosystem based on the solution of the Reynolds equation, which takes into account the rheological characteristics of the lubricant (non-Newtonian properties). We describe the rheological model of the lubricant that takes into account the dependence of viscosity from temperature, hydrodynamic pressure and shear rate. The task of the piston dynamics on the lubricating layer in the cylinder of the diesel engine ChN 13/15 was solved. The influence of non-Newtonian properties on design characteristics of tribosystem was shown. The achieved results can be applied for the design of a diesel engine.

Keywords

piston skirt-cylinder liner tribosystem, non-Newtonian properties, hydromechanical characteristics