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为了控制军用可变截面涡轮增压器的喘振和满足其空气流量的要求,现已研制成一种离心式压气机的可变几何形状扩压器。此外还研制和试验了以下二种压气机叶轮:径向叶轮和后弯叶轮。 性能试验结果表明,可变几何形状压气机在所要求的大多数工况下,达到了流量和效率的指标。由工作曲线图可以看出,后弯叶轮比径向叶轮好。在空气流量大的工况下(在发动机额定转速时)后弯叶轮的压气机效率已高达80％;只是在空气流量非常小的工况下(发动机在最低工作转速时)由于叶轮开始失速,引起效率下降。因此可以确认:可变几何形状压气机适用于效率高和流量范围宽的涡轮增压器。
In order to control the surge of a military variable cross-section turbocharger and to meet its air flow requirements, a variable geometry diffuser for centrifugal compressors has been developed. In addition, the following two types of compressor impellers were developed and tested: radial impellers and backward impellers. The performance test results show that the variable geometry compressor achieves flow and efficiency targets under most of the required operating conditions. It can be seen from the working curve that the back curved impeller is better than the radial impeller. Turbofan impeller efficiency is as high as 80% at high airflow conditions (at engine rated speed); only at very low air flow rates (at minimum engine speed) due to the impeller stalling, Cause the efficiency to drop. Therefore, it can be confirmed that the variable geometry compressor is suitable for a turbocharger with high efficiency and wide flow range.