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对某大负荷过渡段进行了探索设计和数值模拟。对比分析表明:在支板数很少的情况下,支板厚度分布对主流区的流动影响很小,主要通过叶型曲率分布来影响支板表面逆压梯度和分离。凹曲率和凸曲率搭配可以有效控制轮毂、机匣和支板叶尖的流动分离。可以通过支板周向倾斜改变支板叶型在S1流面的安装角,从而起到改变攻角效应和控制流动分离的作用。在条件允许的情况下应尽可能将支板部分或全部置于主流逆压梯度较小的区域以减小支板表面压力梯度和分离风险。
A large load transition section to explore the design and numerical simulation. The comparative analysis shows that the thickness distribution of the slab has little effect on the flow in the mainstream when the number of the slabs is very small, which mainly affects the pressure gradient and separation of the slab surface through the distribution of the leaf curvature. Concave curvature and convex curvature with the effective control of the hub, the casing and the blade tip separation. The effect of angle-of-attack changes and flow control can be controlled by changing the mounting angle of the support leaf in the S1 flow surface by tilting the support in a circumferential direction. Where possible, some or all of the struts should be placed in areas where the mainstream adverse pressure gradient is less likely to reduce the pressure gradient at the stripping surface and the risk of separation.