Computational Study of a Supersonic Mixer-Ejector Exhaust System

摘要

An analytical model of the mixer ejector based on a PNS solver approach has beenapplied to analyze the flowfield downstream of a supersonic mixer-ejector exhaust system. The method has been used previously to analyze the plume flowfield of unshrouded mixer-type nozzles as well as the flowfield within the mixing duct of a mixer-ejector exhaust system. Calculations are presented for a model-scale exhaust system operating at takeoff flight conditions. Favorable comparisons with total temperature and pressure experimental data are presented in the text. In addition parametric studies are presented examining the importance of turbulence level, streamwise vorticity, grid resolution, etc. on the downstream plume mixing characteristics. Finally, a series of calculations examining the effect of engine power setting (operating condition) and exhaust system size (full scale) axe analyzed.