A NEW 1D MODEL FOR SUPERSONIC EJECTOR PERFORMANCE EVALUATION AT CRITICAL AND SUB-CRITICAL OPERATIONAL MODES

摘要

A new 1D model is proposed to predict ejector performance at critical and sub-critical operational modes, while most previous 1D models have predicted ejector performance only at critical mode. Constant pressure mixing is assumed to occur inside the constant area section of the ejector at both operational modes. Experimental data from different ejector geometries and various operation conditions reported earlier are used to verify the effectiveness of the new model. The model has a good performance in predicting the mass flow rates and the entrainment ratio, a useful tool for predicting ejector performance within larger refrigeration cycle models.