Venturi式掺混器几何参数对性能的影响  

Influence of Geometric Parameters of Venturi Mixer on Performance

作　　者：鲍锋 涂立 刘康 卢愿 李亚忠 BAO Feng;TU Li;LIU Kang;LU Yuan;LI Ya-zhong(School of Aerospace Engineering , Xiamen University , Xiamen 361001 , China)

机构地区：[1]厦门大学航空航天学院,福建厦门361001

出　　处：《气体物理》2019年第1期53-63,共11页Physics of Gases

摘　　要：微气泡发生器在污水处理中具有重要用途, Venturi式气液两相掺混器在微气泡生成方面具有众多优良特性.采用数值模拟方法研究了Venturi式掺混器结构几何参数对其掺混性能的影响.运用单一变量法分别研究了不同收缩段曲线,进气孔数目,扩张角的角度对掺混性能的影响,通过对比不同模型仿真结果的出口段气体体积分数、沿轴向压力变化及沿轴向湍动能变化,得出掺混性能最佳的几何参数.研究收缩段曲线时,发现一次直线的气液掺混性能在所选的5条收缩段曲线中最好;研究进气孔数量时,比较了1, 2, 4个进气孔对掺混性能的影响,发现在一定的进气孔数目范围内,进气孔数目的增加可以提高气液掺混效率;研究扩张角变化对掺混效率的影响时,得出在6～9°的范围内,随着扩张角的增大,气液掺混效率随之显著增大.Microbubble generators have important applications in wastewater treatment. The Venturi gas-liquid two-phase blender has many excellent characteristics in the generation of microbubbles. In this paper , numerical simulation method was used to study the influence of geometric parameters of the Venturi-type blender on its blending performance. A single variable method was used to study the influence of the different shrinkage curves , the number of inlet holes , and the angles of expansion on the blending performance. By comparing the gas volume fraction of the outlet section , the pressure and turbulent kinetic energy variations along the axial of different models , the optimum geometric parameters of mixing performance were obtained. When studying the contraction curves , it was found that the gas-liquid blending performance of a straight line was the best among the five selected contraction curves. The number of intake holes was studied. The effects of one , two and four intake holes on the mixing performance were compared. It was found that the increase of the number of intake holes could improve the mixing efficiency within a certain range and the effect of the change in the expansion angle on the blending efficiency was found in this paper. In the studied range of 6 to 9°, with the increase of the expansion angle , the gas-liquid mixing efficiency increases significantly.

关 键 词：FLUENT VENTURI 掺混性能 局部气含率 压力 湍动能 

分 类 号：V211.76[航空宇航科学与技术—航空宇航推进理论与工程]