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论文类型：期刊论文

发表时间：2022-06-30

发表刊物：大连理工大学学报

所属单位：化工学院

期号：1

页面范围：29-36

ISSN号：1000-8608

摘要：The ejector′s performance could be affected easily by the geometric dimension, and different design methods would lead to quite different results, the design point would be seriously deviated.In order to meet the needs of ejection in coal-bed methane with small expansion ratio, the gas ejector is designed according to the Sokolov empirical formulas which are based on aerodynamics theory, and the key structural dimensions are simulated and optimized by CFD method.The influence rule of the ejector′s key structural parameters, such as the nozzle distance, the mixing chamber diameter, the mixing chamber length and the diffuser chamber length on the ejector performance is obtained.By comparing the results of theoretical design and numerical simulation, the isentropic efficiency of the ejector which was optimized by CFD method is about 13% higher than that of using theoretical design.Then, it is verified through experiments that the isentropic efficiency of the ejector will sharply reduce when the operating condition deviates from the design condition.It is proved that the ejector designed by numerical simulation has the higher efficiency, which provides reference to the design of ejector deviating from the design point in engineering.

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