With the increasing exhaust temperature of ship power plant,the infrared radiation generated is gradually enhanced,and the radiation source is the main target of military infrared guidance weapons,which is easily locked by infrared weapons,and the life safety of ships is more threatened.In order to reduce the temperature of the exhaust system and improve the safety of the ship,an ejector as the research object is taken,and the influence of different working conditions and different structural parameters on the performance of the ejector are explored.The results show that when the entrainment ratio increases,the mixing degree approaches 1,and the entrainment capacity of the ejector is enhanced.The increase of the distance between the main nozzle and the mixing section will lead to the increase of the ejection coefficient,the decrease of the total pressure loss,the decrease of the mixing degree and the decrease of the total outlet temperature.The inlet area of the multi-stage ejector increases,the ejection coefficient decreases first and then increases by 0.95,the total pressure loss decreases,and the total outlet temperature fluctuates slightly.By increasing the number of stages of the multi-stage ejector,the ejection coefficient increases,the total pressure loss decreases,and the total outlet temperature of the ejector decreases.Based on the conclusions of this paper,it can be used in the design process of infrared suppressor to improve the overall performance.
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