Underexpanded Impinging Jet : Numerical Solution of Euler Equations

Abstract

The underexpanded jet which is exhausted from the circular nozzle is studied numerically in this investigation. The jet impinges on a flat plate located normal to the jet axis. The axisymmetric Euler equations are solved using a multigrid TVD-type scheme. Jets with different pressure ratios and nozzle-plate distances are simulated. Comparing the numerical results with the experimental ones, good agreement is found and, furthermore, the effect of the nozzle-plate spacing on the wave pattern in the jet can be described. The formation of the separation bubble at a particular nozzle-plate distance is also discussed.