Turbulence Models of Separated Flow in Shock Wave Thrust Vector Nozzle

Abstract

AbstractIn the present paper, based on typical jet flows in shock wave thrust vector nozzles, turbulence modeling in gas flow dynamics has been numerically explored in 2-D laval nozzle which has a secondary injection on one side of its divergent portion in order to simulate the complex strong pressure gradient and accurately capture flow separation point. Nine turbulence models have been adopted and assessed by comparing the obtained results which involve flow separation point and static wall pressure with the available experimental data. Another 3-D nozzle model is simulated using five different turbulence models and results are also compared with experimental data. The numerical results reveal that Goldberg's realizable k-epsilon model gives the best results compared with other models in predicting the shock wave position and separation point, while the SA model shows its advantage in predicting the static wall pressure under certain conditions compared to the Goldberg's realizable k-epsilon model. The computational results were analyzed and the change of the shock structure in different NPRs was discussed in laval nozzle with a secondary flow.Keywords: turbulence modelthrust vector nozzlestatic wall pressureshock wave