Numerical Simulation of Transverse Injection of Circular Jets into Turbulent Supersonic Streams

The flowfields arising from transverse injection of sonic air jets through circular holes on flat plates into supersonic streams have been computed. Favre-averaged Navier–Stokes equations for compressible flow coupled with k–! equations were solved with a finite-volume method. The approximate Riemann solver due to Roe has been used for obtaining inviscid fluxes at cell interfaces, with monotone upwind schemes for scalar conservation laws preprocessing for high resolution and a multistep Runge–Kutta method for time integration to steady states. A detailed comparison has been made with recent laser Doppler velocimetry measurements of velocity and turbulence kinetic energy on the symmetry plane and two crossflow planes. Wall pressures were compared with those obtained with pressure-sensitive paint from the same experimental facility. Wall pressures and features at higher crossflow Mach numbers were examined by simulating a second set of experiments. Computations capture various flow features and show very good qualitative agreement with both sets of experiments. Quantitative agreement is very good in the upstream regions and close to the jet. Small differences appear in the downstream portion as the jet develops. The changes in flow structure with increasing injection pressure suggested by sketches of oil flows are also obtained in the simulation