孔型几何参数对孔型密封泄漏和鼓风加热特性影响研究

To provide a comprehensive selection criterion for the critical geometry parameters of hole depth and hole diameter in the design process of hole-pattern seals, a novel mesh generation method and a steady numerical approach were presented to solve the leakage flow rate and windage heating power for the hole-pattern seal with varying hole depth based on the mesh deformation technique, the displacement diffusion equations of mesh nodes, and steady RANS solutions. The influences of hole depth and hole diameter on the leakage performance and windage heating characteristics were numerically investigated. The leakage flow rate, windage heating power and cavity flow field were computed for the hole-pattern seal with continuously variable hole depth (H=0.5-15 mm) at seven hole diameters (D=2, 3.175, 5, 7, 9, 11, 14 mm). The present numerical methods were validated by comparisons with the experimental data of leakage flow rates at different hole depths and rotational speeds. The results show that the present mesh generation method and numerical approach have reasonable accuracy to predict the leakage flow rate at different hole depths and diameters, with quick solution speed and less computation. The hole-pattern seal possesses the minimum leakage flow rate at the depth-to-diameter ratio (A_R) of 0.15-0.25, and the maximum value at A_R=0.7-0.9. The windage heating power increases with the hole depth, but decreases with the hole diameter. In the design process of hole-pattern seals, it is better to choose a smaller value for the hole diameter in the range diameter of 2-5 mm, and choose a larger value for the hole depth in the range of A_R=0.2-0.5.