Abstract
Piston internal combustion engines (ICE) are the most common sources of energy among heat engines. Currently, most ICEs are equipped with a turbocharging system. Thermomechanical perfection of processes in the intake system largely determines the efficiency of engines. This article proposes a method of stabilizing the pulsating flows in the intake system by installing the leveling grid in the output channel of the turbocharger (TC) compressor. Studies were conducted on an experimental setup, which consisted of a single-cylinder engine and turbocharging system. A constant-temperature thermo-anemometer was used to determine the instantaneous values of the air flow rate and the local heat transfer coefficient. It has been established that the presence of a leveling grid in the intake system leads to a decrease in the turbulence number by up to 25% compared with the basic intake system (while maintaining the flow characteristics). It is shown that the installation of a leveling grid in the intake system of the ICE with TC also leads to a decrease in the heat transfer intensity by up to 15 % compared to the base system. The obtained data expands the knowledge base on the thermomechanics of pulsating flows in hydraulic systems of complex configuration.
Highlights
It is known that the efficiency and reliability of an internal combustion piston engine (ICE) with a turbocharger (TC) depends on the perfection of the thermal and mechanical processes in the intake system [1,2,3]
It has been established that the presence of a leveling grid in the intake system leads to a decrease in the turbulence number by up to 25% compared with the basic intake system
It is shown that the installation of a leveling grid in the intake system of the internal combustion engines (ICE) with TC leads to a decrease in the heat transfer intensity by up to 15 % compared to the base system
Summary
It is known that the efficiency and reliability of an internal combustion piston engine (ICE) with a turbocharger (TC) depends on the perfection of the thermal and mechanical processes in the intake system [1,2,3]. It is obvious that the installation of a turbocharger leads to a significant change in the thermal and mechanical characteristics of the gas flow in the intake system of a piston engine [3,4,5,6]. This is due to the fact that the blade mechanism of the turbocharger is a source of external turbulence for the main pressure flow in the intake system of the ICE with turbocharging. External turbulence can significantly influence the character of development and the structure of the boundary layer with values of the turbulence number Tu greater than 0.1 [4, 5] This will affect the heat transfer intensity
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