Numerical and One-Dimensional Studies of Supersonic Ejectors for Refrigeration Application: The Significance of Wall Pressure Variation in the Converging Mixing Section

This paper studies the pressure variation that exists on converging mixing section wall of a supersonic ejector for refrigeration application. The objective is to show one-dimensional model can be improved by considering this wall’s which typically assumed constant. Computational Fluid Dynamics (CFD) simulations were used obtain aforementioned wall. Four different ejectors simulated. An was obtained from published experimental work and validate CFD simulations. other three modification first parametric study. secondary mass flow rate, m˙s, main parameter compare. validation results indicate transition SST turbulence better than k-omega in predicting m˙s. compared before after incorporating variation. comparison shows effect significant at certain operating conditions. Even around 2% change average give 32% difference prediction For least sensitive case, 7% prediction.