中文摘要：

针对水气两相射流泵传能效率较低、吸气残压过大的问题，结合环形射流和自激振荡射流的优点，提出环形水气自激振荡脉冲射流的概念。以环形射流理论为基础，推导了混合相界面上的连续性方程和动量方程。采用Realizable k-ε紊流模型和欧拉多相流模型对环形水气自激振荡脉冲射流流场分别进行了定常和非定常数值模拟。计算了环形水气自激振荡射流泵的流量比q、压力比h和效率η等性能参数，绘制出基本性能曲线，并与普通环形水气射流泵进行了比较；对下喷嘴处的流体平均速度进行了非定常模拟计算，通过现场实验测试，对下喷嘴处混合相瞬时速度脉冲进行了频率分析。结果表明：与普通环形水气射流相比，环形自激振荡射流对气体的卷吸作用能力增强，且下喷嘴处的混合相瞬时速度值具有显著的脉冲主频。

英文摘要：

Due to the defects of low energy transfer efficiency and high residuary pressure in the water-air two phase jet pumps,the concept on the annular water-air self-excited oscil ation jet is proposed to combine the advantages of annular jet and self-excited oscil ating jet.The conserva-tion of momentum and continuity equations have been obtained based the theory of annular jet. The flow field of the annular water-air self-excited oscil ation jet is numerical y solved by using the Realizable k-εturbulence model and the Euler multiphase model,respectively.The perform-ance parameters of the annular water-jet self-excited scil ation jet pump such as pressure ratio h, efficiencyηand flow ratio q are calculated.The basic performance curve has been obtained as compared with an ordinary annular water-air jet pump.The unsteady fluid average velocity at the down nozzle has been calculated,and the pulse frequency has been obtained.The results show that the entrainment capability could be enhanced by the annular water-air self-excited oscil ation jet as compared with the ordinary annular water-air jet and the average velocity of fluid at the down nozzle has a significant pulse frequency.