Development of a mathematical model to determine seal failure of the air supply system under the conditions of a gasoline engine stand

Abstract

The research findings on the determination of the values of air pressure discharge level in the intake tract of an internal combustion engine, represented by the VAZ-21114 stand at the Department of Technical Service of Automobiles of the Institute of Mechanics and Power Engineering, using mathematical data analysis are discussed. The PISA methodology was analyzed - an improved version of the SIMPLE algorithm used in computational fluid dynamics to solve the Navier-Stokes equations. It was determined that the main type of gas flow in pipelines was turbulent, and in this regard, the dissipation equation was derived which was applied as part of the equation processing by the specialized OpenFOAM software. A three-dimensional model of the intake tract of the VAZ-21114 engine was developed. It was found that the change in the values of the pressure discharge level in the intake tract depending on the values of the leakage area had a smooth graph which indicated a linear dependence of these component characteristics, while this was confirmed by an exponential line; in the presence of a leakage area up to values of 3.135 mm²; there was a sharp jump in the pressure discharge level which indicated a high degree of leakage influence immediately after the occurrence of this malfunction in the intake tract of the engine when passing through the leakage area of 3.135 mm² there was a gradual decrease in the difference between the calculated values of the pressure discharge level which indicated an approach to the values that were critical for the operation of the car engine.