针对车用增压器径流涡轮在运行过程中容易出现高周疲劳失效的问题，使用流固耦合法对比分析不同叶轮前缘倾角的涡轮内部流场和强迫振动。结果表明，叶片前缘倾斜与导叶尾缘形成一定夹角可以减轻转-静子干涉效应。前缘倾斜叶轮在靠近叶片压力面的通道涡比前缘垂直模型的更强，导致涡轮的效率下降。叶片垂直设计在整个叶高范围同时与导叶的尾迹发生切割，增加了气动激励的大小，而叶片前缘倾斜可以减轻尾迹干涉的程度。另外，倾斜叶片前缘设计的吸力面侧压力比垂直叶片前缘的更小，导叶的势场对垂直前缘叶轮叶片的干涉作用更为强烈。综合考虑倾角对效率和最大动应力的影响，得到了合理的倾角设计，叶轮在一阶、二阶谐波压力下最大动应力均有较大程度降低。

Aiming at the problem of easy occurrence of high-cycle fatigue failure in the radial flow turbine of a vehicle turbocharger during operation, the fluid-solid coupling method was used to compare and analyze the internal flow field and forced response of turbine with different leaned leading edge of impeller. The results show that a certain leaned angle between the leading edge of blade and the trailing edge of the guide vane can reduce the rotor-stator interference. The passage vortices of leaned leading edge impeller near the blade pressure side are stronger than those of the vertical leading edge model, resulting in the decrease of turbine efficiency. The vertical design of blade cuts with the wake of guide vane at the same time in the entire blade height range, which increases aerodynamic excitation, and the leaned leading edge of blade can reduce the wake interference. In addition, the suction side pressure of leaned leading edge model is smaller than that of the vertical leading edge model, and the potential field of guide vane has a stronger interference effect on the vertical leading edge impeller. Considering the influence of the leaned angle on the efficiency and the maximum dynamic stress, a reasonable leaned angle is obtained, and hence the maximum dynamic stress of impeller decreases considerably under the first-order and second-order harmonic pressures.