Supersonic ejector-diffuser system is encountered in many engineering applications such as flow transportation, vacuum devices, ejector refrigeration, etc. In the past years, much works have been done to investigate the performance improvement of the ejector. While the improvement of these findings was quite limited compare to other fluid machineries. In the present study, numerical simulations were used to investigate the flow characteristics inside the ejector. The main concerns were focused on the ejector-diffuser performance produced by redesigned chevron nozzles, which replace the conventional convergent nozzle of the ejector. The supersonic flow performances were also compared among different shapes of chevron nozzle in terms of ordinary Chevron, shorter Chevron and extended Chevron. The results show that redesigned chevron nozzle entrain more secondary stream and improve the ejector performance significantly. More detailed investigation was performed into the ordinary Chevron nozzle effects on ejector flow structure and vortex behavior, due to its best performance compare to other nozzles.
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