基于发动机匹配的涡轮增压器压气机优化设计

Turbocharger compressor design and optimization based on engine matching

为了优化一款3L增压中冷柴油机压气机的性能,应用CFturbo软件对压气机进行初始结构设计,通过计算流体力学软件ANSYS CFX计算初始设计压气机性能,并结合AVL BOOST软件完成初始设计压气机与柴油机的性能匹配研究,根据性能匹配结果对压气机结构进行优化设计。研究结果表明:初始设计压气机基本满足性能匹配要求,与原柴油机相比,在整个转速范围内动力性无明显变化,低转速时有效燃油消耗率下降;优化设计压气机与初始设计压气机相比,发动机扭矩增加了约2.8%,有效燃油消耗率在整个转速范围内下降,低转速时下降了约2.5%;优化设计压气机喘振裕度为40%左右,且联合运行曲线高效率范围扩大。优化设计的涡轮增压器压气机提升了柴油机的整机性能。

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.