采用数值求解三维URANS方程和SST湍流模型的方法,对比了不同径向轮缘密封结构的封严性能。本文设计了的7种带槽径向轮缘密封结构,包括4种横向槽结构、1种轴向槽结构和2种斜向槽结构。与传统的简单径向轮缘密封结构相比,横向、轴向和斜向槽结构均能有效提升封严效率。在本文计算的冷气量范围内,带槽密封结构通过增长流动路径和增强涡流两种方式来增加流动阻力,可使封严效率提高0.2~0.35。在四种横向槽结构中,双槽结构的封严效果优于其他结构,槽数过少和槽宽过窄都会降低封严性能。在轴向和斜向槽结构中,轴向槽结构所需封严冷气量最少,斜向槽倾斜方向影响封严性能,顺转向斜向槽结构封严性能更好。

This paper presents a numerical comparison of sealing performance between different kinds of radial rim seal. Three-dimensional unsteady Reynolds-Averaged Navier-Stokes (URANS) equations, coupled with a fully developed shear stress transport (SST) turbulent model from ANSYS-CFX, are utilized to investigate the sealing effectiveness of rim seal. The seven kinds of groove rim seals designed in this work include four circumferential groove structures, one axial groove structure and two oblique groove structures. Compared with the conventional radial rim seal, the circumferential, axial and oblique groove rim seal all can effectively improve the sealing effectiveness. In the range of coolant rates calculated in this paper, the groove rim seal can increase the sealing effectiveness by 0.2-0.35. Among the four circumferential groove rim seals, the sealing effectiveness of double-groove rim seal is better than others. Too few grooves and too narrow groove width reduce the sealing performance. In the axial and oblique groove rim seals, the axial groove rim seal requires the least sealing coolant rate, and the rotation direction oblique rim seal shows better sealing performance.

TK474.7；

国家自然科学基金(52006178,U2241268),国家科技重大专项(2022-DC-I-002-001),国家自然科学基金项目（面上项目，重点项目，重大项目）