CFD-based optimization of iodine mixing for a supersonic COIL

Optimization of iodine injection scheme was conducted in Miki Pulley Co., Ltd. using CFD approach. Variation of the mixing speed as a function of an I 2 jet penetration depth, nozzle expansion ratio, and I 2 injection point are analyzed. It was found that the inherent geometry of our nozzle and I 2 injector affects the I 2 mixing process. Influence of a backpressure to the cavity flow condition was also investigated in order to estimate the pressure recovery capability of our diffuser. The normal shock based diffuser efficiency for Mach=2.7 flow was 54.5%.