考虑结构重量的部分冠涡轮泄漏流动控制研究

In this paper, the flow characteristics and losses of the leakage flow in a partial shrouded low-pressure turbine are analyzed. The loss mechanism in the shroud cavity is discussed. The shroud geometry has experienced two stages of aerodynamic optimization and weight optimization. The changes of flow characteristics and loss before and after the aerodynamic optimization are analyzed. The result shows that there is serious mainstream ingress and circumferential leakage in the exit cavity; The resultant mixing loss makes the loss in the exit cavity the most significant, accounting for 80% of the total loss inside the shroud cavity; The optimized shroud geometry can effectively eliminate the circumferential leakage, suppress mainstream ingress, improving turbine stage performance by 0.54%; Reasonable design of the shroud geometry can sustain the turbine stage efficiency improvement by 0.48% and obtain a weight reduction by 6.1% compared to the datum shroud geometry.