叶轮机械中叶顶间隙形态对三维粘性流场影响的数值研究

基于非正交曲线坐标下完全守恒型N-S方程，采用一种新的整体型网格生成技术，用数值方ㄉ钊胙芯恳抖ゼ湎抖匀承粤鞒〉挠跋欤治鲂孤┝鞫投瘟鞫南嗷プ饔茫芯啃孤┪杏胪ǖ牢校眉湎读骺梢栽谝欢ǔ潭壬弦种贫ゲ壳ǖ牢械确矫娴淖饔茫治龊侠淼募湎缎翁芯烤断蚣湎洞笮〖捌溲刂嵯虻姆植级砸墩つ诓苛鞫鹗Ш妥苄阅艿挠跋臁

A numerical method was applied to investigated the influence of blade tip clearance shapes on aerodynamic performance of turbomachinery. The calculations are based on the three-dimensional Navier-Stokes equations expressed with nonorthogonal curvilinear coordinates and corresponding nonorthogonal velocity components, and the explicit time marching algorithm and an efficient integral grid were employed. The details of generation and development of passage vortex, leakage vortex and tip separation vortex were predicted. The computed results shows, because the direction of the leakage flow is opposite to that of the passage secondary flow, proper leakage flow can weaken the intensity of passage vortex and improve the flow in tip region.