基于计算流体力学模拟的蒸汽喷射器结构优化  

Optimal Design of Steam Ejector by Computational Fluid Dynamics Simulation

作　　者：李金梦 郑宏亮[2] 刘霞[1] 杨福胜[1] 张早校[1] 

机构地区：[1]西安交通大学,陕西西安710049 [2]中国寰球工程公司辽宁分公司,辽宁抚顺113006

出　　处：《流体机械》2016年第7期42-46,共5页Fluid Machinery

摘　　要：蒸汽喷射器的设计分析通常采用气体动力学或一维理论方法,但这些方法常常得不到最佳的几何结构。本文应用计算流体力学方法对用于余热回收的蒸汽喷射器的内部流场进行数值模拟,并分析了喷嘴喉部直径、混合室入口直径、等截面段直径、喷嘴出口到混合室入口的距离和等截面段长度对喷射系数的影响,然后采用5水平5因素的正交分析法对喷射器进行了多结构参数的变化分析。结果表明,通过正交分析法得到的喷射器结构参数组合能够实现较优的性能。The one-dimensional theory and the gas dynamic function method,which are often used for the geometrical design of ejector,generally fail to provide the ejector structure with the best performance.Therefore,in this work the Computational Fluid Dynamics method was employed to simulate the flow field and the performance of a steam ejector for waste heat recovery.The effects of key parameters,i.e.nozzle throat diameter,mixing chamber inlet diameter,constant area section diameter,nozzle exit po-sition and constant area section length on the entrainment ratio were investigated.Afterwards,based on the L25 （5 6 ）orthogonal a-nalysis,the performance of steam ejector was further analyzed by varying multiple structure parameters.The results show that su-perior performance of steam ejector is achieved by orthogonal analysis method.

关 键 词：蒸汽喷射器 数值模拟 结构优化 正交试验法 

分 类 号：TH137[机械工程—机械制造及自动化] TK037[动力工程及工程热物理]