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结合西北工业大学低速风洞的设计研究了矩形截面三维收缩段设计问题。用差分方法和贴体坐标对收缩段的不可压势流场进行了数值计算。选择三种常用的收缩曲线进行比较设计,对设计准则进行了校核,并给出收缩殴流动特性。通过优化的双三次曲线优于其他曲线。最后对三维收缩段设计问题提出一些看法。
Combined with the design of low speed wind tunnel of Northwestern Polytechnical University, the design problem of three-dimensional contraction section with rectangular section was studied. Using the difference method and body-fitted coordinates, the incompressible flow field in the shrinkage section is numerically calculated. Three commonly used shrinkage curves were selected for comparison design. The design criteria were checked and the characteristics of shrinkage flow were given. By optimizing the bicubic curve is better than the other curves. Finally, some suggestions on the design of three-dimensional contraction section are put forward.