Abstract
Ejector is valuable to improve the transcritical CO2 refrigeration cycle. The improvement on geometric parameters is significant for the performance enhancement of CO2 ejector. In this paper, numerical simulation based on a homogeneous equilibrium model is used to implement the sensitivity analysis on the key geometric parameters. With the simulation, the influence mechanisms of the key geometric parameters on the macro-performance under overall operation conditions of the ejector are discovered based on the analysis of flow field structure and local exergy destruction distribution. The results show that the outlet area of primary nozzle, convergent angle of pre-mixer and nozzle exit position are strongly coupled. A sensitivity matrix of these three key geometric parameters to local exergy destruction distribution is obtained to evaluate their synergism quantitatively. This work would provide a new way to guide the optimization on the pre-mixer of the ejector considering the coupling effect of geometric parameters.
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