Особенности нестационарных тепломеханических процессов в выпускном коллекторе автомобильного поршневого двигателя размерности 8,2/7,1

Abstract

The purpose of this work was to obtain experimental data on unsteady gas dynamics and the intensity of heat transfer of the flow in the exhaust system of an automobile piston engine for different initial conditions. The research was carried out on an experimental stand simulating the exhaust process in a piston engine in dynamics. The pressure at the outlet (in the cylinder) varied from 0.05 to 0.2 MPa, the speed of rotation of the crankshaft - from 600 to 3000 min-1. The method of thermal anemometry was used to determine the gas dynamic, flow and heat exchange characteristics of the flow in the exhaust system. Data on the instantaneous values of the velocity and local heat transfer of the flow in the exhaust system for different boundary conditions are presented in the article. The effect of the outlet pressure on the gas flow through the exhaust system and the level of heat transfer was analyzed. The spectral analysis of changes in the local flow velocity in the exhaust system is additionally presented in the article. The obtained patterns are useful in the applied aspect for clarifying engineering methods for calculating the exhaust system and for verifying mathematical models of gas exchange processes in automotive piston engines.