A CFD analysis of the flow structure inside a steam ejector to identify the suitable experimental operating conditions for a solar-driven refrigeration system

作者：Allouche Yosr^*; Bouden Chiheb; Varga Szabolcs

来源：International Journal of Refrigeration, 2014, 39: 186-195.

DOI：10.1016/j.ijrefrig.2013.07.027

• Steam ejector
• Computational fluid dynamic
• Entrainment ratio
• Experimentation
• Flow structure

This paper presents a numerical study of a steam ejector using CFD with the objective of identifying suitable experimental conditions that allows for a reliable ejector cycle operation. The flow structure and the mixing process inside the ejector were assessed for a range of operating conditions typical for a solar driven air conditioning system. The effect of varying the condenser pressure was studied. It was found that for relatively low condenser pressures (%26lt;2.5 kPa), two distinct shock waves occurred in the diffuser section resulting in a reduced recompression efficiency, although it did not have a direct impact on the entrainment ratio. The effect of generator pressure was also studied. It was found that the entrainment ratio showed a maximum for constant condenser conditions. A near optimal condition of 70 kPa generator and 3 kPa condenser pressures were identified and tested in a preliminary experiment carried out with the solar driven ejector system installed in Tunis. 2013 Elsevier Ltd and IIR.

• 出版日期2014-3