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采用数值方法联合标准k-ω两方程湍流模型求解雷诺平均Navier-Stokes方程组,研究了平顶和分别采用被动、主动以及复合间隙控制方法的凹槽顶、平顶喷气、凹槽顶喷气4种不同叶顶结构下涡轮性能对叶顶间隙变化的敏感性,分析了间隙变化对间隙流场结构及损失的影响,研究了涡轮性能随叶顶间隙变化的规律,并对采用不同间隙控制方法的叶顶结构所带来的效率收益对攻角变化敏感性进行了评估.结果表明:在不同间隙控制方法下叶顶泄漏涡强度随间隙的增加速度变缓,尤其在复合间隙控制方法下更为明显,从而使得在复合间隙控制方法下涡轮性能对间隙变化的敏感度最低;仅仅涡轮叶片前缘区域泄漏流动对攻角变化比较敏感,使得凹槽顶结构具有最佳的攻角变化适应性.
The numerical method was combined with the standard k-ω two-equation turbulence model to solve the Reynolds-averaged Navier-Stokes equations. The effects of flat top and groove top, flat top jet and groove top gas 4 on passive, active and compound clearance control methods The influence of turbine performance on the change of tip clearance under different kinds of roof structures was analyzed. The influence of the gap variation on the structure and the loss of the flow field was analyzed. The variation of turbine performance with the tip clearance was studied, and the influence of different clearance control methods The results show that the blade tip leakage vortex strength increases slowly with the gap under different gap control methods, especially under the control of composite gap So that the sensitivity of the turbine performance to the gap change is the lowest under the composite clearance control method. Only the leakage flow in the leading edge of the turbine blade is sensitive to the change of the angle of attack, which makes the groove top structure have the best adaptability to the change of the angle of attack .