Supersonic ejectors are widely used in a range of applications such as aerospace, propulsion, and refrigeration… This work evaluates the performance of six well-known turbulence models for the study of supersonic ejector performance and operation. The primary interest of this study is to set up a reliable hydrodynamics model of a supersonic ejector, which may be extended to refrigeration applications. The validation deals particularly with ejectors of zero induced flow. It concentrates on the prediction of shock location, shock strength and the average pressure recovery. In this respect, axial pressure measurements with a capillary probe and performed previously [18,19], have been used in this work for validation and comparison purposes with numerical simulation. A crucial point is that the probe has been included in the numerical model. In these conditions, the RNG and k- omega-sst models have been found to perform satisfactorily for these parameters. For ejectors with an induced flow, preliminary tests have also been performed. Laser tomography pictures were used to evaluate the non-mixing length. This parameter has been numerically evaluated by including an additional transport equation for a passive scalar, which acted as an ideal colorant in the flow. The results have shown significant departures from measurements for secondary pressure with the decrease of the primary pressure. In this condition, the k-omega-sst model has been found to account best for the mixing.
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