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利用三维湍流数值模拟方法模拟某跨声速高压涡轮流场,研究了转子叶尖间隙高度对涡轮转子间隙泄漏流动的影响,详细描述了间隙流动结构随间隙高度的变化情况。研究结果表明:随着间隙高度的增加,间隙泄漏流流量线性增加,并导致转子叶尖附近流体偏转角度减小。间隙高度每增加1%相对叶高,间隙泄漏流量占总流量的比例约增加2.1%。间隙高度变化对间隙内部流动的影响明显:当间隙比较小时,随着间隙高度的增加,分离泡的大小迅速增加,回流区域减小。随着间隙高度的增加,间隙泄漏涡尺度迅速增加,同时由于泄漏流中高速流体流量增加,通道涡远离叶片吸力面并向靠近机匣的方向移动,泄漏涡也向远离吸力面方向运动。
The flow field of a transonic high-pressure turbine was simulated by three-dimensional numerical simulation of turbulent flow. The influence of rotor tip clearance height on the leakage of turbomachine rotor was studied. The variation of clearance flow structure with clearance height was described in detail. The results show that as the gap height increases, the leakage flow increases linearly, and the fluid deflection angle decreases near the rotor tip. For each 1% increase in clearance height, the ratio of clearance leakage flow to total flow increased by approximately 2.1%. The effect of gap height changes on the internal flow of the gap is obvious. When the gap is small, the size of the separated bubble increases rapidly and the recirculation area decreases as the gap height increases. With the increase of clearance height, the vortex scale increases rapidly. At the same time, due to the increase of high-speed fluid flow in the leakage flow, the vortex channel moves away from the suction side of the blade and moves closer to the casing. The leakage vortex also moves away from the suction surface.