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根据五十年代初开始建立起来的三元流动通用理论,利用文献[2—5]提供的计算机程序,用一个中心S_2流面和几个S_1迴转面交叉迭代的方法进行了高亚音静子的三元气动设计(反问题)计算。在交叉迭代过程中,静叶前S_1流片的形状和厚度变化及前、后远方的边界条件是一个不易确定的问题。本文通过新近提出的一个满足静叶前间隙中规定气体参量的相当流场的计算方法得到S_1流片的形状和厚度以及远前方周向均匀的进气条件。在迭代过程中熵的处理的一致性也是一个需要考虑的问题。计算结果表明S_1计算中必须适当考虑熵增的影响,以便与S_2流场中的熵值相一致,并能得到较高的迭代精度。这样做后,本文经过四轮迭代,就得到了S_1和中心S_2对应点上的各项参数相对差别都在2％以内的收敛解,并同时得到了满足流量和厚度分布的叶型及其叶面上的压力分布和速度分布,因之是一个可以实用的三元流叶片设计方法。
According to the general theory of ternary flow established in the early 1950s, using the computer program provided in [2] and [5], the cross-iteration of a central S_2 flow surface and several S_1 gyroscopic surfaces was used to perform three Meta-aerodynamic design (inverse problem) calculation. In the cross-iteration process, the shape and thickness of the pre-stator S-1 slice and the boundary conditions of the front and back afar are not easy to be determined. In this paper, we obtain the shape and thickness of the S_1 flake and the uniform inlet conditions in the forward direction by using a newly proposed method for calculating the equivalent flow field that satisfies the specified gas parameters in the pre-stator clearance. The consistency of the entropy processing during the iteration is also a problem to be considered. The calculation results show that the influence of entropy increase must be properly considered in S_1 calculation so as to be consistent with the entropy value in S_2 flow field, and higher iteration accuracy can be obtained. After doing this, after four rounds of iteration, we obtain the convergent solution that the relative difference between all the parameters at S_1 and S_2 is within 2%, and at the same time obtain the leaf type and its leaf that satisfy the flow and thickness distribution The surface pressure distribution and velocity distribution, so it is a practical method of ternary flow blade design.