Ｅxperimental and simulative investigation of HYLTE nozzle's mixed flowfield in DF/HF chemical lasers

The flowfield of hypersonic low temperature(HYLTE)nozzle in continuous wave DF/HF chemical lasers was visualized by laser induced iodine fluorescence(LIIF) and simulated by the CFD software FLUENT. The results from the two methods were compared and basically accord with each other. In the condition given in the article, the oxidant flow was drilled by the fuel. It was compressed first and expanded later.The two streams mixed enough at the plane 10m away from the exit plane. The experimental results show that the direction of the fuel stream changed slightly while the simulative result indicated that the fuel stream flowed almost along the x axis．