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分流叶栅或串列叶栅的流场计算和试验研究是透平机械S_1流面问題中的一个重要课题。但求解分流叶栅或串列叶栅的气动正命题是比较困难的,主要在于确定准确的出气角和绕分流叶片的环量值或者分流比。本文在用有限元素法求解多分流叶栅或串列叶栅S_1任意旋成流面上的气动正命题时,把绕叶片的环量位作为无节点的自变量进行直接求解,而不是把它作为一个强加边界条件来处理,从而避免了以前为使叶片尾缘满足广义库塔条件所需的迭代过程。计算与实验结果吻合良好。本文还用自编的程序对多分流叶柵进行了多方案的计算,提出了一种气动性能较好的汽轮机高压隔板多分流叶栅设计,并对这种多分流叶栅和带不同加强筋的叶栅进行了静吹风试验,试验结果表明,这种多分流叶栅比原来带加强筋叶栅的流动损失明显下降。
The flow field calculation and experimental study of split cascade or tandem cascade is an important issue in the flow field of turbine S_1 flow surface. However, it is difficult to solve the aerodynamic positive proposition of splitter cascade or cascade cascade mainly because of determining the exact outlet angle and the ring value or shunt ratio around the splitter blades. In this paper, finite element method is used to solve the aerodynamic positive proposition of arbitrary flow on a multi-split cascade or tandem cascade S_1. Instead of taking it as an argument without nodes, Is treated as an imposing boundary condition, thus avoiding the previous iterative process required to satisfy the generalized Kutta condition for the blade trailing edge. Calculation and experimental results agree well. In this paper, multi-split cascade is also calculated by using self-programmed program. A multi-split cascade design for high-pressure separator of steam turbine with better aerodynamic performance is put forward. In this multi-split cascade and with different reinforcement The test results show that the flow loss of the multi-split cascade is obviously lower than that of the original one.