摘要
采用CFD软件Fluent数值求解了前缘开设涡漩腔的涡轮静叶栅的三维流动,分析了叶栅沿流向各截面二次流及叶栅的气动特性。研究发现在叶片前缘开设的涡漩腔构造可以明显地降低叶栅二次流损失。通过所开设的涡漩腔的深度和角度不同的三个方案的比较,发现深度和角度越大的涡漩腔方案控制二次流的效果越好。涡漩腔的减损效果可以解释为由于涡漩腔的吸取作用,使得边界层内湍流度增加以及边界层厚度减少。
Computational fluid dynamics are used to solve the three - dimensional flow field of turbine stator cascade with vortex chamber in the front of turbine stator cascade. The pneumatic characteristic and secondary flow of stator cross section through flow direction are analyzed. The result shows that vortex chamber in the fxont of stator can reduce the secondary loss gradually. By comparison with different depths and angles of vortex chambers, it is found that the increase of depth and angle will greatly improve the stator secondary flow control. Essentially, the reason is due to the imhibition effect of vortex chamber, which increases the turbulence in boundary layer and decreases the boundary layer thickness.
出处
《燃气轮机技术》
2008年第3期44-46,共3页
Gas Turbine Technology
关键词
二次流:涡轮
静叶栅
数值模拟
涡漩腔
secondary flow
turbine
stator cascade
numerical simulation
vortex chamber
