气液两相流引射器的数值仿真及实验研究

目前引射器的研究多集中于单相引射器,气液两相引射器的研究较少,针对引射器实际应用的数值仿真研究更少。为此,在双流体模型的基础上,结合有限体积法及标准k-ε两方程湍流模型,全面考虑工作喷嘴、混合室、扩压管等对引射器性能的影响,对引射器进行了全流场仿真及实验研究。结果表明:(1)混合流体沿流动方向压力不断升高,实验值与仿真结果吻合;(2)引射器中流体具有明显的射流特征;(3)设计的引射器背压在0.08～0.1MPa之间为宜;(4)在其它条件不变的情况下,升高被引射流体压力和工作流体压力均有利于增加引射器引射系数。

Numerical simulation and experimental research of gas-liquid ejector

The model for numerical simulation of the gas-liquid ejector is set up based on finite volume method and standard two phase κ-ε turbulence model. The result of experimental research shows that, (1) the pressure of the mixed liquid rises continuously, and the measured value is identical to the simulation result; (2) the fluid in the ejector has the distinct characteristic of jet flow; (3) the design back pressure of the ejector is better to be 0.08-0.1 MPa; (4) enhancing the pressure of the ejected fluid or working fluid will be both helpful to improving the ejecting factor of the ejector under the same condition.