However, it should be noted that the test was not carried out directly in a refrigeration application. Constant-area mixing ejector was used with entire supersonic regime. Not only the experimental investigation, but some researchers tried to explain the flowing and mixing processes through an ejector by using the Computational Fluid Dynamics (CFD) software package. Recently, with the rapid development of the computer and its resources. Models are 3-D flow inside the R245 ejector. In this study, the compressible real gas model was applied on the large numbers of grid elements.