超声速膨胀器设计及其内部流动研究

Research on Design and Internal Flow of Supersonic Expander

借鉴超声速喷管和传统涡轮结构与特性,设计了超声速膨胀器。对其内部三维流场的数值研究结果表明,超声速膨胀器能够实现气流膨胀加速,膨胀波的出现导致静压沿节距方向分布不均,流道出口附面层分离、回流、低能流体与主流掺混以及激波附面层相互作用是能量损失的主要来源。

According to the structure and characteristics of supersonic nozzle and traditional turbine,the structure of supersonic expander was designed.Numerical study of three-dimensional flow field shows that airflow could be expanded and accelerated in the expander,and existing of expansion waves leads to non-uniform distribution of static pressure in the pitch direction.The boundary layer separation,back flow,the low energy fluid mixing with the mainstream,shock waves and boundary layer interaction are the main sources of losses.