Studies on stability and dynamics of a swirling jet |
| |
Authors: | Hu Guohui Sun Dejun Yin Xieyuan Tong Binggang |
| |
Institution: | (1) Department of Modern Mechanics, University of Science and Technology of China, 230026 Hefei, China |
| |
Abstract: | 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.
The project supported by the National Natural Science Foundation of China (19772052) |
| |
Keywords: | swirling jet finite difference instability |
本文献已被 SpringerLink 等数据库收录! |