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利用数值方法求解三维非定常雷诺平均Navier-Stokes方程模拟某跨声速高压涡轮流场,研究了某跨声速高压涡轮流场的非定常特征,通过详细分析动静干涉对间隙泄漏流动的影响,进一步明确了泄漏流周期性变化的规律和成因.研究发现:静子尾缘燕尾波的外侧分支外尾波是间隙内部流动结构变化的主要原因,间隙泄漏涡的周期性变化则受外尾波和尾迹的共同影响.外尾波深入转子通道内部周期性经过间隙,在间隙前缘附近产生很强的逆压梯度,使间隙前部流动方向明显改变而产生大范围分离.外尾波导致间隙泄漏流量明显增加并周期性震荡.在静子尾迹和外尾波共同作用下,泄漏涡强度出现波动且涡的位置前后移动,使泄漏涡呈现明显的非定常性.
The unsteady flow field of a transonic high-pressure turbine is simulated by solving the three-dimensional unsteady Reynolds average Navier-Stokes equation by numerical method. The unsteady characteristics of a transonic high-pressure turbine flow field are studied. The influence of dynamic and static interference on the leakage of clearance is further clarified The regularity and cause of periodic change of leakage flow were studied.The results show that the outer coda of the lateral wake of the tail of the stator is the main reason for the variation of the flow structure inside the gap and the periodic variation of the leakage vortex is affected by the outer coda and the wake , The outer coda wave penetrates into the interior of the rotor passage and periodically passes through the gap, resulting in a strong reverse pressure gradient near the leading edge of the gap, resulting in a large range of separation in the forward flow direction of the gap. Increasing and periodically oscillating.In the joint action of stator wake and external coda, the leakage vortex intensity fluctuates and the vortex position moves back and forth, making the leakage vortex obvious non-stationary.