基于肋条切除的尖区旋涡演化调控研究

Vortices Evolution Control in the Tip Region Based on Cutback Squealer Tips

叶尖端区各种旋涡的演化对涡轮气动性能有较大影响,本文采用数值模拟的方法,通过肋条部分切除的方式对尖区旋涡的控制进行了研究。结果表明:切除前缘吸力侧肋条使泄漏流与通道涡掺混,能延迟泄漏涡的形成并抑制通道涡在下游的发展,涡轮级效率有小幅提升;切除尾缘吸力侧肋条使凹槽腔内流体卷入泄漏涡,能补充泄漏涡的动量从而减小泄漏涡的破碎损失,涡轮级效率提升明显。

The evolution of various vortices in the tip region of the rotor blade has a great influence on the aerodynamic performance of the turbine.In this paper,the numerical simulation method is used to study the control of the vortices in the tip region based on cutback squealer tips.The results show that near the leading edge of suction side cutback tip causes the leakage fow to mix with the upper passage vortex,which can delay the formation of the leakage vortex and inhibit the development of the upper passage vortex in the downstream,and the turbine stage efficiency is slightly improved.Near the trailing edge of suction side cutback tip causes the fuid in the cavity to be involved in the leakage vortex,which can supplement the momentum of the leakage vortex to reduce the loss of vortex breakdown,and the turbine stage efficiency is significantly improved.