双流体共引喷射器数值优化研究

双流体共引喷射器是船用海水淡化设备的关键部件,其结构参数和工作参数将对性能产生较大影响,利用数值模拟方法优化双流体共引喷射器的结构参数和工作参数,分析结果显示:随着出口直径的增大,引射效果增强;喷嘴处的最低压力随着喷嘴距的减小而降低,将增强一、二级喷嘴处的引射效果。两级喷嘴面积比要大于一定值才能获得较好的引射效果,同时不同面积比,导致两级喷嘴处的压力差也不同。喷嘴直径和喷嘴倾斜角不变的情况下,工作入口直径越大,引射效果越差;喷嘴倾斜角需要在一定范围内才能满足设计要求,改变喷嘴倾斜角对一级喷嘴处的影响会比二级喷嘴处的影响大。

STUDY ON NUMERICAL OPTIMIZATION OF EJECTOR WITH TWO FLUIDS

The ejector with two fluids is a key component of the seawater desalination equipment. Its structure and working parameters will influence its performance. The numerical simulation method is used to optimize the structure and operation parameters of the ejector with two fluids. The analysis results show that the eject effect is enhanced with increasing outlet diameter, the minimum pressure at the nozzle decreased with the nozzle distance decreases and the eject effect of primary and secondary nozzle ejector effect will enhance. Two nozzle area ratio to be greater than a certain value will improve the eject effect. At the same time the different area ratio leads to the pressure difference at the two stage nozzle is also different. Under condition of the nozzle diameter and nozzle inclination angle no changing, inlet diameter is larger and the eject effect is worse. The nozzle angle is also kept in a certain range and it can meet the design requirements. With the change of the nozzle angle, it can influence the first nozzle effect than that to the second nozzle.