Experimental and numerical thermofluidic assessments of an air-based ejector regarding energy and exergy analyses

摘要

In this study, an air based ejector (ABE) was designed and manufactured, and the experiments were conducted for air as the working fluid with several motive pressures at two different nozzle exit positions. Furthermore, a simulation was carried out through the Realizable k-e turbulence model to predict effect of the inlet primary pressure, and the nozzle exit position on the first and second laws of Thermodynamics within the ABE. The hydrodynamic behavior of the flow field as well as the exergy dissipation values within the ABE at different inlet primary pressures, and positions of nozzle were assessed. Moreover, the results revealed that the strain rate value and the situation of the vortex inside the ABE determine the alteration of energy type, i.e. the kinetic energy enhances and a vacuum is created. Ultimately, the highest first and second law efficiencies of the ABE were 37% and 82%; respectively, at nozzle exit position equal to -10 mm.