Visualisation d'un Ecoulement transcritique diphasique supersonique de CO2 dans un Ejecteur d'un systEme frigorifique
Flow visualization of supersonic two-phase transcritical flow of CO2 in an ejector of a refrigeration system
Abstract Supersonic two-phase flow of CO 2 in an ejector was investigated in flow visualization experiments. The ejector was installed in a transcritical CO 2 ejector-expansion refrigeration system with a convergent primary nozzle and a rectangular mixing chamber. The flow fields in the suction chamber and the mixing chamber of the ejector were visualized by direct photography for various operating conditions. The results showed that the liquid in the primary flow after the primary nozzle exit increased with increasing primary flow and secondary flow pressures. The expansion angle of the primary flow at the nozzle exit decreased with increasing secondary flow pressures. The primary flow was blocked in some cases at the mixing chamber entrance due to the large expansion angle which reduced the entrainment performance. The entrainment ratio was inversely related to the expansion angle. The primary and the secondary flows had a short mixing region in the mixing chamber with the mixed flow quickly becoming uniform. Highlights Two-phase flow in a supersonic CO2 ejector was visualized. The liquid fraction after nozzle exit increases with increasing inlet pressures. The expansion angle at nozzle exit decreases with increasing secondary flow pressures. The entrainment ratio is inversely related to the expansion angle.
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