Integrative optimization numerical simulation of cavity and diffuser

The performance of supersonic diffuser downstream the cavity in chemical oxygen-iodine laser pressure recovery system can obviously influence the flow field quality in cavity, and its static pressure recover and total pressure loose performance can determine the pressure recovery system size downstream the diffuser. This paper uses the numerical simulation method to research the influence of supersonic diffuser design parameter such as diffuser angle and diffuser outline and back pressure and so on. The study shows that, the static pressure ratio was increased about 33% and the total pressure recover coefficient was increased to 0.484 by means of adding a constant section with wedges between the cavity and the supersonic diffuser. At the same time, the flow filed quality such as static pressure and Mach number distribution in cavity was obviously improved.