The flow characteristics in the rim clearances of turbines are sensitive to the turbine rim structures. From this standpoint, rotor–stator cavity models with dislocated clearances are proposed in this study to reveal the effect of dislocated turbine rim lips on hot gas ingestion and the clearance flow characteristics. The results show that the rim clearance flow is unstable, and Kelvin–Helmholtz vortices are induced by the relatively large difference in circumferential velocity of the flow fields inside and outside the rim seal. Moreover, the dislocated turbine rim lips decrease the effectiveness of the rim seal. Ultimately, the responses of the flow characteristics to the dislocated rims are determined to be primarily reflected in the effect of the forward or backward step flow on the Kelvin–Helmholtz vortices in turbine rims.

涡轮机边缘间隙中的流动特性对涡轮机边缘结构很敏感。从这个角度来看，本研究中提出了具有错位间隙的转子 - 定子腔模型，以揭示错位的涡轮轮缘唇对热气吸入和间隙流动特性的影响。结果表明，边缘间隙流不稳定，边缘密封内外流场的圆周速度差异较大，会诱发开尔文-亥姆霍兹涡。此外，错位的涡轮轮缘唇会降低轮缘密封的有效性。最终，流动特性对错位边缘的响应被确定为主要反映在向前或向后阶梯流对涡轮机边缘中的开尔文-亥姆霍兹涡流的影响中。