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。对下喷嘴处的流体平均速度进行了非定常模拟计算。对下喷嘴处混合相瞬时速度脉冲进行了频率分析。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得到增强,且下喷嘴处的混合相瞬时速度值具有显著的脉冲主频。
Due to the defects of low energy transfer efficiency and high residuary pressure in water-gas two phase jet pump,the concept of annular water-air self-excited oscillation jet has been put forward combining with the advantages of the annular jet and the self-excited oscillating jet. The conservation of momentum and continuity equations has been obtained based on the theory of annular jet. The flow field of the annular water-air self-excited oscillating jet has been simulated by using the Realizable k-ε turbulence model and the Euler multiphase model on the steady and unsteady simulations respectively. The performance parameters of the annular water-jet self-excited oscillation jet pump,such as the pressure ratio h、the efficiency η and the flow ratio q,have been calculated,and the basic performance curve has been obtained comparing with ordinary annular water-air jet pump. The average fluid speed at the down nozzle has been calculated via the unsteady simulation,and the frequency of instantaneous pressure pulse at the down nozzle has been obtained by analyzing the experiment data. The results showed that the entrainment capability can be enhanced by the annular water-air self-excited oscillation jet comparing with the ordinary annular water-gas jet,and the instantaneous speed of the mixed phase at the down nozzle has a significant pulse frequency.
出处
《机械科学与技术》
CSCD
北大核心
2014年第5期741-745,共5页
Mechanical Science and Technology for Aerospace Engineering
基金
国家自然科学基金项目(51376204)
重庆市博士后科研特别项目(XM201232)资助
关键词
自激振荡射流
涡激空化
环形射流
self-excited oscollation jet
two phase flow
vortex cavitation
