Abstract
Nowadays, there is an increasing demand for devices which work efficiently with the smallest possible consumption of energy. In this regard, incorporating ejectors seems to be an interesting choice. This paper describes the numerical analysis of the flow in a supersonic ejector working with R32 (difluoromethane) as the working fluid. The ejector geometry under investigation in this paper has already been experimentally analysed, however, air was used as the working fluid. Therefore, this paper deals with a numerical analysis of the same geometry but with a different working fluid. Furthermore, the design of the ejector enabled the adjustment of a particular distance of the motive nozzle from the beginning of the mixing chamber, i.e. the nozzle exit position (NXP). This work examines the ejector numerically for eleven values of back-pressure with the NXP of two millimetres; consequently, the performance line of the ejector with fixed boundary conditions at both inlets was obtained. Finally, the obtained results are discussed and some recommendations for future research have been made.
Highlights
These days, there is an increasing demand for devices which work efficiently with the smallest possible consumption of energy
The geometry and mesh were created in SpaceClaim and Ansys Meshing, respectively
It is worth noting that some calculations on the same geometry has already been performed and presented by Kracik and Dvorak [6]; air was used as the working fluid
Summary
These days, there is an increasing demand for devices which work efficiently with the smallest possible consumption of energy. In this regard, incorporating ejectors in refrigeration cycles seems to be an interesting choice. The main part is a convergent-divergent nozzle which enables the reach of supersonic velocities at its exit, and further downstream Achieving such high velocities is possible due to the sufficient pressure gradient between two certain points downstream, and upstream, the nozzle and a proper shape of the nozzle. The secondary stream enters the mixing chamber at high velocities. Both streams are expanded from their total or stagnation pressures on a common expansion pressure (p12).
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