Numerical Simulation Of Steam Jet Ejector Performance Of Solar Refrigeration System

With the development of economic, human demand for energy is growing, and conventional energy consumption is causing series of environmental problems, so new energy development and utilization is under increasing attention. Therefore, solar energy becomes the focus of the industries’development and utilization because of its abundant resources, no transportation, no environmental pollution.The solar ejector refrigeration is superior to other refrigeration methods, the system is simple, almost no moving parts, stable operation, and long service life. Therefore, this paper is focus on solar ejector cooling system, a variety of refrigerants commonly used in cooling system as working fluid, the overall performance of the system is analyzed, and three-dimensional numerical simulation is used on the ejector.Firstly, the solar ejector refrigeration system performance, two-dimensional and three-dimensional numerical simulation of steam ejector are reviewed in aspects of their development and research status at home and abroad, and the main contents of this paper is presented; Then the paper focuses on changing trend of the system performance with refrigerant type, operating parameters; Then according to the principles and methods of steam ejector design described by Sokolov, the structural design of the ejector is carried out, and three-dimensional numerical simulation using FLUENT software is carried out. The results are:The coefficient of the ejector increases with the increase of the pressure of the working fluid and injecting fluid, decreases with the increase of the outlet pressure; And with the increase of the pressure of working fluid, the injection coefficient increasing trend is gradually weakened; When the injecting fluid pressure is too low or mixing fluid outlet pressure is too high, the working fluid can not cite jet injecting fluid, that is, the ejector can not work; The injection coefficient is more ideal when nozzle expansion angle changes within the range of8～16°; The injection coefficient is better when nozzle contraction angle changes within the range of30～40°; The sectional area ratio of the ejector throat has a significant impact on the injection coefficient. The ejector does not work when the value is too low, the injection coefficient is rapidly reduced when it is too large; The streamline structure can improve the ejector performance, but its bending degree has little impact on the ejector performance; nozzle outlet with the injector can help improving its performance.