Turbocharger compressor design and optimization based on engine matching

In order to improve the compressor performance of a 3L turbocharged inter-cooled diesel engine, initial structure of the compressor for a turbocharged system was designed by means of CFturbo software, and performance of the compressor was calculated with computational fluid dynamics software ANSYS CFX. Meanwhile, the performance matching between initial compressor and diesel engine were researched in combination with AVL BOOST software.Based on the matching results, the optimization of compressor structure was designed. The results indicate that the initial design of compressor can basically meet the matching requirements, and compared with the diesel engine, there is no significant power changes throughout the rotational speed range, the fuel consumption declining at low speed. Compared with the initial compressor, the engine torque of optimized compressor increases by 2.8%, the fuel consumption declines over the whole rotational speed range, and declines by 2.5% at low speed; the surge margin of optimized compressor is about 40%, and the high-efficiency region of combination operating curves extends. The optimized compressor of the turbocharger can improve performances of the diesel engine.