جايگاه الگوسازي توربين پرخوران در مراحل تطابق پرخوران به موتور

Turbocharger Turbine Modeling Situation in the Process of Matching Turbocharger to the Engine

Appropriate turbocharger selection in matching the turbocharger to an internal combustion engine is a complex proc ess,in which several parameters should be accounted. Turbocharger matching should be performed in a way that high efficiency in the wide range ofengine operation to be obtained. In the turbocharger matching, not only compressor but also turbine should perform acceptable performance in the range of engine operation. In matching procedure, first , the performance maps ofturbine and compressor shou Id be determined experimentally or theoretically. In this paper, performance characteristics of twin entry radial turbines are determined. This procedure is based on steady state one-dimensional modeling of turbine using governing equations considering loss coefficients. In the turbocharger Lab. , the performance characteristics ofthe turbines have been determined experimentally in the wid e range of operation conditions. Comparing modeling results with the experimental data shows good agreement. Finally, the CNG engine performance is simulated and compared with the experimental results . These two simulations are employed to match the turbine to the engine. The results of matching two turbines with different geometry to the engine show that one of the turbines presents appropriate matching to the engine in the range of engine operation with the highest efficiency.