Helical Symmetric Flows with Swirl

带有旋流的螺旋对称流

• 批准号: 9310181
• 负责人: Zvi Rusak
• 金额: $ 25.5万
• 依托单位: Rensselaer Polytechnic Institute
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1994
• 资助国家: 美国
• 起止时间: 1994-03-01 至 1997-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9310181&HistoricalAwards=false
• 关键词: Helical; Symmetric; Flows; Swirl

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. ***

小行星9310181 利用螺旋对称性对涡破裂现象进行了理论研究。基于螺旋坐标系的控制方程，将得到各种渐近解和数值解，它们与螺旋驻波、发展中的停滞区、边界层近似的失效和螺旋对称的锥形流有关。 新的标准开始崩溃的旋流将开发从这样的解决方案。涡流破裂发生在飞行器上和具有涡流的内部流中，例如锅炉中的燃烧系统。其机制尚未完全 明白 ***