中文摘要：

针对某可调向心涡轮导叶段存在的强激波和端壁泄漏损失,设计了一种后加载特性导叶,并在级环境下进行了研究。首先对比了原模型设计开度下的数值与实验结果,验证了数值模型的有效性,然后进行了将原模型和新模型的定常与非定常计算。结果表明：后加载型导叶在通过降低导叶端壁泄漏涡强度而减小其总压损失的同时可大幅度弱化导叶喉部和尾缘激波强度;导叶间隙泄漏流和尾缘激波的减弱使转子叶片静压波动强度降低,增强了转子叶片的可靠性。

英文摘要：

For the strong clearance leakage flow and shock wave in the guide vane of a variable nozzle turbine, an Aft-Loaded guide vane was redesigned and studied in stage environment. A comparison between the numerical and experimental results of the original vane was carried out to validate the numerical model under the design opening condition of the guide vane. Steady and unsteady numerical simulations were implemented for the original and designed vanes. The results indicate that the Aft-Loaded vane can decrease the total pressure loss by reducing the intensity of the leakage vortex. Meanwhile, the intensity of the throat shock wave and the trailing edge shock wave could also be weakened. The intensity weakening of the trailing edge shock wave and leakage vortex could reduce the static pressure fluctuation intensity of the rotor blades, and the reliability of the rotor blades will be enhanced.