, Volume 8, Issue 2, pp 79-83

Navier-Stokes computations of the supersonic ejector-diffuser system with a second throat

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The supersonic ejector-diffuser system with a second throat was simulated using CFD. An explicit finite volume scheme was applied to solve two-dimensional Navier-Stokes equations with standard k – ε turbulence model. The vacuum performance of the supersonic ejector-diffuser system was investigated by changing the ejector throat area ratio and the operating pressure ratio. Two convergent-divergent nozzles with design Mach number of 2.11 and 3.41 were selected to give the supersonic operation of the ejector-diffuser system. The presence of a second throat strongly affected the shock wave structure inside the mixing tube as well as the spreading of the under-expanded jet discharging from the primary nozzle. There were optimum values of the operating pressure ratio and ejector throat area ratio for the vacuum performance of the system to maximize.