Abstract
Thermomechanical characteristics of the gas flow at the turbocharger compressor outlet largely determine the quality of the intake process in piston engines with boost. The article presents the results of an experimental study of gas-dynamics and heat transfer of gas flows after compression in a turbocharger centrifugal compressor. A brief description of the experimental setup, the configuration of pipes under investigation, the measuring system and the experimental features are given. The studies were carried out on a free compressor, i.e. without considering the piston part. Different conditions in the compressor outlet channel were created by installing special nozzles with different hydraulic resistances. It has been established that the local heat transfer increases from 23 to 46 % with an increase in the turbocharger rotor speed, depending on the outlet channel configuration. It should be noted that an increase in rotor speed is also accompanied by an increase in air flow through the channel. The increase in flow rate was from 10 to 42 %.
Highlights
Most modern internal combustion engines (ICE) are equipped with turbochargers (TC), i.e. a supercharging system based on a gas connection between the piston part and the scapular machine
This article presents the results of an experimental study of gas-dynamics and heat transfer of gas flows in the output channel after compression in a centrifugal compressor of a turbocharger
It is established that the air flow is reduced by an average of 15% when installing a confuser (32 mm) in the compressor outlet channel, compared to a free outlet (46 mm); and the average air flow rate is decreased up to 50% when setting the diaphragm (20mm) in the output channel
Summary
Most modern internal combustion engines (ICE) are equipped with turbochargers (TC), i.e. a supercharging system based on a gas connection between the piston part and the scapular machine. The receipt of new data on the features of gas-dynamics and heat transfer in gas-air tracts of turbocharged engines is an important task, since the efficiency of power machines based on ICEs depends on the perfection of these processes [1,2,3]. Modern research in this field is devoted to the study of the parameters of gas flows at the inlet and outlet of the TC turbine [4,5,6], heat transfer inside the compressor [7], the thermal effect of the turbine on the compressor in the composition of the TC [8] and ways to improve the efficiency of the turbocharger [9, 10]. This article presents the results of an experimental study of gas-dynamics and heat transfer of gas flows in the output channel after compression in a centrifugal compressor of a turbocharger
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