Numerical analyses of gaseous injection into a mach 5.0 freestream through diamond orifices
A numerical investigation of sonic gaseous injection through 15 half-angle diamond shaped orifices at four incidence angles (27.5, 45, 90 and 135) and three total pressures (0.1, 0.46 and 0.63 MPa) into a high Reynolds number (53 106) Mach 5.0 freestream was performed. The numerical simulations were performed with the GASPv4 code, with the k - turbulence model. The goal of the numerical analyses was improved flowfield understanding. Results indicate that the shock separation distance is influenced by the injection angle of incidence and the total pressure of the jet. Penetration increases with increasing jet total pressure both in the lateral and normal direction. Total pressure loss analysis agrees with the trends obtained in experiments for the 27.5, 45 and the 90 cases. The total pressure loss for the 135 case was found to be lower compared to the 90 case. The vortex cores in the flow were identified and a new transverse counter rotating vortex pair was identified. 2003 by the American Institute of Aeronautics and Astronautics, Inc. All rights reserved.