Evaluation of friction losses in textured hydrodynamic tribo-units of piston machines. Part 2. Parametric studies of the ICE connecting rod bearing

One of the ways to reduce frictional losses is to use texturing of the friction surface. The use of texturing affects the formation of cavitation and turbulence zones, which is a poorly studied aspect in the modern literature. The texturing of the crankshaft liners can be in the form of elliptical microwells of various sizes. The previous part was devoted to the description of the methodology for modeling the hydrodynamic losses in the lubricating layer taking into account the phenomena of cavitation and turbulence and the analysis of scientific sources. The parameter of the dimensionless distance to the wall y+ is considered in detail, as well as its influence on the calculation of the values of shear stresses using modern numerical methods. This paper presents the results of modeling the lubricant layer in connecting rod bearings with different types of liner surface texturing, at different loads. The initial data for modeling are based on experimental results. The calculations were carried out in the commercial software package ANSYS Fluent and software developed by the authors. The data obtained indicate a positive effect of the texturing of the connecting rod bearing friction surface on its hydromechanical characteristics with the correct selection of the texture geometric parameters, which in turn requires optimization and parametric studies. The values of the saturated vapor fraction depend on both the load value and the type of texturing. The purpose of this article is to assess the effect of texturing on the hydromechanical characteristics of a connecting rod bearing.