An ejector refrigeration recycle system can not only save energy and protect the environment but also realize recycling because it uses water as the working medium.The structure of the shock wave inside the ejector,i.e.,the core component of the system,is discussed and divided in detail by numerical simulation.The determination basis of the pseudo-shock region,constant velocity region,oblique shock region and positive shock region is given for the first time.The influence of shock wave structure on the ejector's operating characteristics is discussed.The results indicate that the position of positive shock wave is affected by the outlet back pressure.The pseudo-shock region is the direct factor that determines the ejector's entrainment ratio.Shock train is important in reducing the flow velocity and restoring pressure in the ejector.The presence of a shock-mixing layer separates the working steam from the flow path of the ejecting steam.The working steam passes through the shock-mixing layer to carry and accelerate the flow of the ejecting steam.The area of the shock-mixing layer is affected by the ejector's geometry and the working conditions of the working steam.Therefore,understanding and mastering the structure of shock waves is of reference value to understand the internal fluid flow law of the ejector,to improve the working efficiency of the ejector,and to further improve and optimize the ejector's geometry.
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