Numerical Investigation of dual secondary injection for thrust vector control

Abstract

Paper presented at the 7th International Conference on Heat Transfer, Fluid Mechanics and Thermodynamics, Turkey, 19-21 July, 2010.Dual secondary injection for thrust vectoring in a convergent-divergent nozzle is studied by solving three dimensional RANS equations with the help of a Computational Fluid Dynamics (CFD) code. This study surveys the flowfield structure and perfomance of dual secondary injection and compare with single secondary injection. Air as calorifically perfect gas is used fur primary and secondary flows. Realizable k-s (Rke) turbulent model with enhanced wall treatment approach is used for viscous model. Density based solver and explicit scheme are used as solver. A set of tests with different distance between ports are run to investigate the effect of injection location on the flowfield. Results stated that for the specified test nozzle and fix secondary mass flow rate dual injection with distance between two ports bigger than nearly 8.5 diameter of the injection port produces side force more than a single injection with the same mass flow rate. It also reduces the probability of bow shock impingement to the opposite wall and therefore side force production has less limitation.