STUDIES ON STABILITY AND DYNAMICS OF A SWIRLING JET

• 来源期刊: 力学学报(英文版)
• 学科: 物理学
• 年，卷（期）: 2001,（3）
• 所属期刊栏目: CONTENTS
• 页码范围: 237-244
• 页数: 8页
• 分类号: O3
• 语种: 英文

摘要

The temporal instability and nonlinear evolution of the swirling jet near a nozzle exit are studied by both normal-mode method and three dimensional direct numerical simulation (3D DNS). It is found that the swirl enhances the maximum linear growth rates for negative helical modes, while decreases the growth rate for axisymmetric mode. Numerical simulations show that the evolution in early stage is compared well with the linear stability theory. In nonlinear stage, the swirl promotes the breakup of 3D large scale organized structures in the flow into small eddies.