Abstract
Two-dimensional Navier-Stokes equations were solved to obtain local distributions of pressure, temperature and Mach number of the complex flow field in a steam ejector. From the computational results, we obtain that there is a critical discharging pressure for given motive pressure and suction pressure. The effects of motive fluid pressure, motive fluid overheat, suction fluid pressure and discharge fluid pressure on the entrainment ratio and critical discharging pressure were concluded in detail. Analysis was also done to comprehend the reason of shocks emerging, their positions, and their effects on ejector performance. Phase transition phenomenon occurred in the ejector when using steam as working fluid was obtained through calculating the percent of saturated water in the mixture. The effect of the ejector’s geometrical structure on its performance is further studied and high COP of the ejector is gained by optimizing its structure.
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