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MIXING OF SEVERAL FLUIDS IN AN ACCELERATED NOZZLE FLOW

The present paper investigates the turbulent mixing of the heavy precursor gas TEOS in a hot accelerated transonic air co-flow. A mass flux of ṁinj,TEOS = 0.5 g s TEOS premixed with ṁinj,N2 = 0.32 g s nitrogen is injected in an air co-flow with a mass flux of ṁco−flow = 100 g s at Maco−flow = 0.66 and Tco−flow = 1200K and afterwards accelerated to supersonic speed. High frequency, non equilibrium turbulence phenomena dominated by pronounced free shear layers are expected to significantly affect the mixing process. Therefore, a large-eddy simulation (LES) which is capable of capturing the turbulent behavior on the relevant scales is used to simulate the mixing process. An efficient multi-species LES method based on the MILES technique with an explicit 5-stage Runge-Kutta scheme is applied. The results of the simulations show that the wake is dominated by strong vortex shedding from the blunt injector trailing edge. The mixing process is impeded by these primary vortices.