Influence of speed of sound in two-phase region on 1-D ejector performance modelling

Calculating two-phase speed of sound is important to 1-D ejector modelling using wet working fluid. In this study, influences of six correlations on ejector modelling results were investigated. Ejector model based on mass, momentum and energy conservation equations was adopted and real gas properties were used. The characteristics of the predicted speed of sound in two-phase region with pressures and mass fraction of vapor were analyzed. It revealed the predicted speed of sound changed dramatically with mass fraction of vapor under different pressures and discrepancy among these speed values were showed. Based on 1-D ejector model, results showed maximum 0.91% and 8.57% deviations with these correlations when using R134a and water as working fluids, respectively.