기하학적 형태가 혼합층 유동특성에 미치는 영향에 대한 수치해석

다국어 초록 (Multilingual Abstract)

The effect of many parameters(velocity ratio, merging angle, etc.) on the turbulent mixing layer has been investigated. However, it hast not been fully understood yet. Therefore, the objective of this study is to investigate the characteristics of the turbulent mixing layer using CFD(Computational Fluid Dynamics). In particular, the studies of Azim and Islam[1](straight type) and Mehta[2](contraction type) were selected as reference to focus on the effect of geometrical forms (merging type, merging angle, etc.). The present simulation results showed that in the contraction type, the flow becomes self similar in earlier positions as compared to the straight type. Also, in the contraction type, the thickness of the mixing layer becomes thinner and turbulent intensity smaller.

참고문헌 (Reference)

1 Azim, M.A., "Plane mixing layers from parallel and non-parallel merging of two streams" 34 (34): 220-226, 2003

2 Ito, Y, "Momentum and mass transfer in developing liquid shear mixing layers" 51 : 28-36, 2013

3 Guo, F, "Investigation of trubulent mixing layer flow in a vertical water channel by particle image velocimetry(PIV)" 88 (88): 919-928, 2010

4 Metha, R.D., "Effect of velocity ratio on plane mixing layer development : influence of the splitter plate wake" 10 (10): 194-204, 1991

5 Dziomba, B., "Effect of initial conditions on two-dimensional free shear layers" 152 : 419-442, 1985

6 Laizet, S, "Direct numerical simulation of a mixing layer downstream a thick splitter plate" 22 : 015104-, 2010

7 Ghaemi, S., "Counter-hairpin vortices in the turbulent wake of a sharp trailing edge" 689 : 317-356, 2010