Improvement of one-dimensional simulation of national engine with consideration of heat transfer and mechanical loss effects in the turbocharger

Document Type : Research Article

Authors

1 Energy conversion, Mechanical engineering, Amirkabir university, Tehran, Iran

2 Amirkabir university

3 Irankhodro Powertrain Company, Tehran, Iran

Abstract

Nowadays, Turbochargers play an important role in improving the efficiency,
downsizing and pollutant reduction of internal combustion engine. Due to
the existence of hot gas flow in the turbine and surrounding air flow in the compressor,
the temperature difference between two sides of turbocharger is high and this high
temperature difference causes heat transfer from the turbine to the other
turbocharger components. The heat transfer reduces the turbocharger performance
because some of the hot gas energy has been removed through heat transfer. There is a need to accurate estimation of the temperature of the turbine exhaust gases to determine the path of the exhaust gases or to determine the boundary conditions of the second turbocharger in engines containing (two-stage turbochargers), and also a need to estimate the compressor outlet temperature as a boundary condition for intercooler and combustion chamber in the absence of an intercooler. In this study, turbocharger one-dimensional heat transfer model is coupled to one-dimensional engine simulation. The results show an improvement (up to 50 °C) in prediction of turbine outlet temperature and also does not affect other characteristics of the engine simulation such as compressor outlet temperature, turbocharger speed, engine brake power, turbine outlet pressure and etc.

Keywords

Main Subjects

References

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Amirkabir Journal of Mechanical Engineering
Volume 51, Issue 4
September and October 2019
Pages 71-80

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