蒸汽喷射器的三维数值模拟研究  

Simulation of Interior 3D Flow Field of Steam Ejector

作　　者：邵天[1] 杜亚威[1] 刘燕[1] 张少峰[1] 

机构地区：[1]河北工业大学海水资源高效利用化工技术教育部工程研究中心,天津300130

出　　处：《真空科学与技术学报》2014年第3期305-311,共7页Chinese Journal of Vacuum Science and Technology

基　　金：河北省科学技术研究与发展计划项目(12276711D)

摘　　要：借助STAR-CCM+软件对热泵蒸发系统中的核心部件蒸汽喷射器进行了三维数值模拟,采用有限体积法离散控制方程,标准k-ε湍流模型,近壁面处使用壁面函数修正。考察并分析了工作蒸汽、引射蒸汽压力及喷嘴喉部直径对蒸汽喷射器的工作状态及内部流场状态的影响,采用速度云图和压力云图来解释喷射器内的混合情况,得到了针对此尺寸的蒸汽喷射器的最佳操作参数。数值计算结果表明,通过计算流体力学数值模拟找到工作蒸汽压力和喷嘴喉部直径的最佳值,使得蒸汽喷射器的喷射系数达到最大,从而起到节能作用。The 3-dimension flow field of the steam ejector, a key component of the heat pump evaporation system, was modeled and simulated with software package STAR-CCM ＋ . The axisymmetric Navier-Stokes equationswere solved in an explicit finite volume method with a standard k-ε turbulence model, and the flow field near the wall was corrected by means of the wall-function simulation. The effects of the major factors, including the motive steam pressure, suction steam pressure, and nozzle throat diameter, on the operating state and flow field state were analyzed. The optimum operation con- ditions of the steam ejector were calculated by describing the mixing inside the ejector in terms of the velocity and pres- sure nephograms. The simulated results show that the maximum entrainment ratio of the steam ejector could be obtained by optimizing the motive steam pressure and throat diameter with computational fluid dynamics （CFD）.

关 键 词：蒸汽喷射器 计算流体力学 数值模拟 喷射系数 

分 类 号：TQ021.1[化学工程]