排气扩压器的作用是将发动机排出燃气的部分动能转换成压力能，真实模拟发动机排气反压和环境压力条件。
The function of exhaust diffuser is to transform part of momentum energy of exhaust gases from engine into pressure energy to simulate actual exhaust back pressure and environment pressure.
离心压缩机中，叶片扩压器对提高压缩机整机性能、拓宽有效运行范围发挥着举足轻重的作用。
Vaned diffuser plays an important role in centrifugal compressor as it can improve the performance of compressor and broaden the operating range.
发现了叶片扩压器对遏制蜗壳对叶轮内流场的影响有明显的作用。
It is found that vane diffuser restrains the influence of the volute on the impeller.
离心压缩机中的静止元件如扩压器、蜗壳等，对提高压缩机整机性能、拓宽有效运行范围发挥着举足轻重的作用。
Static components such as diffusers and volutes play an important role in the centrifugal compressor because they can improve the performance of the compressor and broaden the operating range.
通过对外加电磁场下的扩压器与无外加电磁场条件下扩压器的比较，总结了MHD控制对于超声速扩压器的作用效果评估。
Through the comparison of the diffuser with and without added electric and magnetic field, the evaluation of MHD control effect on supersonic diffuser is concluded.
通过对外加电磁场下的扩压器与无外加电磁场条件下扩压器的比较，总结了MHD控制对于超声速扩压器的作用效果评估。
Through the comparison of the diffuser with and without added electric and magnetic field, the evaluation of MHD control effect on supersonic diffuser is concluded.
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