Helical Symmetric Flows with Swirl

[9310181] Rusak将利用螺旋对称的方法对涡旋击穿现象进行理论研究。利用基于螺旋坐标系的控制方程，将得到关于驻螺旋波、发展停滞区、边界层近似失效和螺旋对称锥形流的各种渐近解和数值解。将从这些解中发展出旋流破裂开始的新准则。涡旋击穿发生在飞机上和有涡流的内部流动中，例如锅炉的燃烧系统。它的机制还不完全清楚。* * *

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. ***