采用二维轴对称流动模型 ,计算分析了吸入通道内回流现象、喷射器“恒能力”现象与静压力在轴线上分布情况之间的关系 ;探讨了工作压力对喷射器性能的影响。结果表明 :持续降低出口压力会在混合室内形成激波 ,喷射因数保持不变 ;工作压力过高会在混合室内产生壅塞 ,反而降低喷射因数 ;吸入压力过低会在喷射器吸入通道内产生回流现象 ,影响喷射式制冷系统运行的安全性。 Using the two-dimensional axisymmetric flow model, the relationship between the phenomenon of backflow in the suction passage, the “constant capacity” of the ejector and the distribution of static pressure on the axis was calculated and analyzed. The effect of working pressure on the ejector performance was also discussed. The results show that the continuous reduction of the outlet pressure will cause shock wave in the mixing chamber and the injection factor will remain unchanged. If the working pressure is too high, it will cause congestion in the mixing chamber and reduce the injection factor; if the suction pressure is too low, reflux will occur in the suction passage of the ejector Phenomenon, affecting the safety of jet cooling system operation.