A Study on the Effect of Injection Angle to Two-Dimensional Supersonic Mixing Flow with Slotted Injection

Experimental and computational studies on supersonic mixing by slotted injection with various injection angle have been conducted. In the experiment flat plate model is installed into supersonic free stream of Mach number of 4 and fully developed turbulent boundary layer is established on the flat plate. The secondary jet is injected through slot nozzle set on the flat plate model in order to simulate SCRAM-jet supersonic mixer. Experiments are conducted by changing injection angle of helium gas in order to observe the effect of injection angle to the supersonic mixing. The flow fields are visualized by the Schulieren method. Also surface pressure distributions and spatial distributions are measured. The same flow fields are simulated by solving tow-dimensional full Navier-Stokes equation of mixture gas of air and helium and calculated results are compared with experiments. Quite good agreement is obtained in wall pressure distributions. And qualitative agreement is obtained in volume fruction distribution. By using the calculated results, the correlations between the mixing rate and the total pressure loss of the flow field are obtained.