Helical Symmetric Flows with Swirl

9310181利用螺旋对称性对旋涡破裂现象进行鲁萨克理论研究。采用基于螺旋坐标系的控制方程，可以得到各种渐近和数值解，包括：驻留螺旋波、发展中的停滞区、边界层近似的失效以及具有螺旋对称性的圆锥流。根据这些解决方案，将制定旋流破裂开始的新标准。涡流破裂发生在飞机上和带有漩涡的内部流动中，例如锅炉中的燃烧系统。到目前为止，人们还不完全了解它的机制。***

9310181 Rusak Theoretical research is to be carried out of the vortex breakdown phenomenon with an approach utilizing helical symmetry. With the governing equations based on a helical coordinate system, various asymptotic and numerical solutions will be obtained bearing on: standing helical waves, developing stagnation regions, failure of boundary layer approximations, and conical flows with helical symmetry. New criteria for the onset of breakdown in swirling flows are to be developed from such solutions. Vortex breakdown occurs on aircraft and in internal flows with swirl, such as for example combustion systems in boilers. Its mechanisms are as yet only incompletely understood. ***