Heat Transfer in an Automotive Turbocharger Under Constant Load Points: an Ezperimental and Computational Investigation
Nowadays the turbocharger is one of the most commonly used devices to supercharge an engine. Heat fluxes in the turbocharger are not negligible and affect the performance prediction of the turbine. From different experimental investigations it has become clear that heat fluxes from the turbine to the compressor have a great influence on the compressor performance and therefore on the overall turbocharger performance. For this reason understanding the heat transfer within the turbocharger components and from the turbocharger to the ambient environment is essential important to determine the critical heat paths to be considered in the design tools. In order to investigate the behavior of the heat fluxes occurring in the turbocharger an experimental and computational study has been carried out at Imperial College on a Ford 2.0 liter diesel engine. Beyond the standard measurements necessary to determine the operating points of the compressor and turbine, a novel set of seventeen thermocouples was installed on the turbocharger measuring the inner and outer wall temperature of the turbine and compressor casing, the bearing housing and exhaust manifold temperatures. In addition to these, the air and oil flow rate, temperature and pressure were also measured. A one-dimensional model was also developed. The developed algorithms are merged using a MATLAB programme that calculates the compressor nonadiabatic efficiencies and exit temperatures based on the turbocharger geometry, the turbine inlet temperature and the maps of the turbine and the compressor in adiabatic conditions. The simplification of the turbocharger was kept as low as possible and, unlike the other models, no heat transfer coefficients were used. The test results provided profound insight into the temperature distributions occurring within the turbochargers and in particular the role played by the exhaust manifold. Furthermore, the data generated with the test enabled us to quantify the heat fluxes and to validate the one-dimensional model. The model prediction of the temperature and non-adiabatic efficiencies is a significant improvement on previous models. The main outcomes of the research carried out at Imperial are reported in this paper.
heat transfer turbocharger turbine compressor engine model ezperimental performance
A. Romagnoli R.M.F. Botas
Dept. of Mechanical Engineering, Imperial College of Science and Technology Exhibition Road, South Kensington SW7 2AZ, London, United Kingdom
国际会议
The Fourth International Symposium on Fluid Machinery and Fluid Engineering(第四届流体机械与流体工程国际会议)
北京
英文
1-7
2008-11-25（万方平台首次上网日期，不代表论文的发表时间）