Numerical Study of Mizing Enhancement by a New Mizer in a Model Scramjet Engine
A vent mixer is a new concept of supersonic mixing device in scramjet engines. A numerical study has been conducted to investigate the characteristics of a vent mixer. Several models with different geometries are compared, and aerodynamic performance was analyzed. Compared with a backward facing step, a vent mixer has an active mixing process in the recirculation zone and has a low total pressure loss. Air flow through a hole of the vent mixer makes a separation bubble in the bottom wall of the recirculation zone. The separation bubble divides the flow into two paths; one is the upward recirculation flow and the other is downward direction. It is a key point to elongate the recirculation zone and to enhance the mixing in the recirculation zone. In general, direct parallel injection in the recirculation zone has a high momentum thrust but has a low mixing efficiency. A vent mixer has a high mixing efficiency for the parallel injection, because inflow from the hole directly affects the injected fuel jet. And numerous vorticities are developed between air and fuel, which increase micro-mixing efficiency. And several recirculation bubbles in the recirculation zone increase the macro-mixing efficiency.
Vent mizer Mizing efficiency Separation bubble Total pressure loss
Chae-Hyoung Kim In-Seuck Jeung
School of Mechanical and Aerospace Engineering, Seoul National University, Seoul, 151-744, Korea
国际会议
北京
英文
1-5
2008-10-23（万方平台首次上网日期，不代表论文的发表时间）