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对采用无叶扩压器、叶片扩压器以及串列叶片扩压器的车用增压器离心压气机内部流动进行了数值分析,研究了不同扩压形式对压气机性能的影响。结果表明,低稠度叶片式扩压器在设计工况点附近可以有效提高压气机效率;串列式叶片扩压器则可以改善叶片扩压器流量范围减小的问题。在小流量工况下,气流角与设计工况不同,攻角增大,使得流动分离加剧,损失变大。通过调节叶片安装角可以减小气流攻角,改善压气机性能。基于本文研究结果,可以为全可调离心压气机的设计和调节策略的研究提供理论依据。
Numerical simulations of the internal flow of centrifugal turbochargers using vaneless diffusers, vane diffusers and tandem vane diffusers were carried out. The effects of different diffuser types on compressor performance were investigated. The results show that the low-consistency vane diffuser can effectively improve the compressor efficiency near the design working point. The tandem vane diffuser can improve the flow reduction of the vane diffuser. In low flow conditions, the airflow angle is different from the design conditions, the angle of attack increases, making the flow separation intensified, the loss becomes larger. By adjusting the blade mounting angle can reduce the air flow angle of attack, improve compressor performance. Based on the results of this study, we can provide a theoretical basis for the design of the fully adjustable centrifugal compressor and its regulation strategy.