空心静叶缝隙抽吸对蒸汽流场影响的数值研究  

Numerical Simulation on the Effects of Hollow Stationary Slot-suction on the Steam Flow Field

作　　者：王新军[1] 王侯玲[1] 仇璐珂[1] 韩宇萌[1] 

机构地区：[1]西安交通大学叶轮机械研究所,西安710049

出　　处：《汽轮机技术》2010年第1期35-38,共4页Turbine Technology

基　　金：国家高技术研究发展计划资助项目(2007AA05Z251)

摘　　要：在缝隙抽吸条件下,采用Fluent软件对某600MW汽轮机末级空心静叶栅内的蒸汽流场进行了三维数值模拟,讨论了缝隙位置与结构参数对主蒸汽流场的影响。结果表明:随着缝隙位置从叶片前缘向叶片尾缘的移动,汽流总压损失系数逐渐减小。缝隙抽吸使叶栅进口马赫数有所升高,且内弧上的缝隙抽吸对马赫数的影响要大于背弧上的影响;当缝隙角度α=45°时,缝隙抽吸对叶栅进口马赫数的影响较大;缝隙宽度的增大使叶栅进口马赫数升高的幅度也越大。缝隙抽吸对叶片表面压力分布总体影响不大,仅在缝隙附近的汽流静压有较大的降低;随着缝隙宽度的增加,缝隙处的汽流静压降低越大。另外,缝隙抽吸使叶片表面的汽流边界层有所减薄。Under the conditions of slot-suction, the steam flow field in the last stage hollow stationary cascade of a 600MW steam turbine was simulated with the CFD software Fluent. The effects of slot positions and structure parameters on the steam flow field were discussed. The results show that the total pressure loss coefficient decreased gradually with the slot position closer to the blade trailing edge. The slot-suction enables Mach number at stationary cascade inlet larger, and the concave side slot suction influence on the Maeh number was greater than that on the convex side. The slot suction influence on the Math number at cascade inlet was larger relatively when the slot angle was 45°. The Maeh number at cascade inlet increasing range was larger with the slot width increased. The slot suction had little influence on the blade surface pressure contribution only the steam static pressure decrease largely nearby the slots. The steam static pressure nearby the slots decreased largely with the slot width increasing. The slot suction made the boundary layer of steam thin. The slot suction effect on the boundary layer decreased as the angle of the slot increased and he boundary layer thickness decreased as the width of slot increased.

关 键 词：空心静叶 缝隙抽吸 数值模拟 蒸汽流场 边界层 

分 类 号：TK263[动力工程及工程热物理—动力机械及工程]