CFD analysis of operating condition effects on optimum nozzle exit position of a supersonic ejector using the refrigerant R134a

In this work, the computational fluid dynamics technique is employed to study operating condition effects on optimum value of an important parameter called nozzle exit position (NXP) for ejector design. This uses gas R134a as working fluid. Numerical tests are carried out using a combination REFPROP 7.0 database state equation and high-Reynolds version SST k–ω model. Good agreement in terms entrainment ratio critical temperature obtained between computed values measurements. addition, numerical results indicate that NXP maximizes performance highly dependent conditions.