Abstract
The study of gas-dynamic processes in gas-air systems of engines in order to improve the processes of gas exchange, mixture formation and combustion is an urgent task. The results of experimental studies of gas-dynamic processes in the intake system of an engine with turbo-compressor are presented in the article. A brief description of the setup and methods of experiments is presented. A spectral analysis of functions was chosen as a tool for monitoring gas-dynamic phenomena in different systems. A comparative analysis of the amplitude spectra of the pulsations of the velocity and pressure of the flows in the intake system of the engine with and without a turbo-compressor is presented in the article. The installation of a turbo-compressor leads to a significant change in the structure of gas flows in the intake system. A method for stabilizing the pulsating flow in the intake system by installing a leveling grid in the output channel of the compressor is proposed. It has been established that the presence of a leveling grid in the intake system of an engine with turbo-compressor leads to a decrease in the low-frequency amplitudes of the velocity pulsations and the pressure of the flow by up to 30%.
Highlights
The gas-dynamic perfection of the intake and exhaust systems of piston internal combustion engine (PICE) largely determines the quality of the gas exchange processes, as well as the phenomena of mixing fuel and air and their subsequent ignition [1,2,3]
The installation of a turbo-compressor leads to a significant change in the structure of gas flows in the intake system
It has been established that the presence of a leveling grid in the intake system of an engine with turbo-compressor leads to a decrease in the low-frequency amplitudes of the velocity pulsations and the pressure of the flow by up to 30%
Summary
The gas-dynamic perfection of the intake and exhaust systems of piston internal combustion engine (PICE) largely determines the quality of the gas exchange processes, as well as the phenomena of mixing fuel and air and their subsequent ignition [1,2,3]. A large number of scientific works are devoted to the study of the flow structure in gas-air systems of engines with and without turbo-compressor (TC) based on numerical simulation of flows [6,7,8]. Experimental studies of the flow structure in the systems under consideration using optical methods (by the high-speed PIV-method) have been carried out in recent years [11,12,13]. In most cases these studies provide only a visual picture of the flow structure, on the basis of which one can only assume the scale of turbulence in ducts and engine cylinder.
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