竖直L形弯管中气液两相流压降特性  

Pressure Drop Characteristics for Gas-liquid Two-phase Flow in Vertical L-shaped Elbow

作　　者：汪冰 陈善群 廖斌[1,2] WANG Bing;CHEN Shan-qun;LIAO Bin(Civil Engineering and Architecture College,Anhui Polytechnic University,Wuhu 241000,China;Key Laboratory for Mechanics,Anhui Polytechnic University,Wuhu 241000,China)

机构地区：[1]安徽工程大学建筑工程学院,芜湖241000 [2]安徽工程大学力学重点实验室,芜湖241000

出　　处：《科学技术与工程》2023年第7期3011-3019,共9页Science Technology and Engineering

基　　金：安徽省自然科学基金(2008085QA22);安徽工程大学国家自然科学基金预研基金(Xjky2020167);安徽高校研究生科研项目(YJS20210454)。

摘　　要：为探究重力作用下弯管的最佳几何形态,采用Fluent中的Realizable k-ε紊流模型结合Mixture两相流模型对竖直条件下L形弯管中气液两相流的压降特性进行了系统的数值研究。具体针对不同的弯径比R/D(R/D=1~7)、气相体积率α(α=0~0.3)和液相雷诺数Re_(l)(Re_(l)=2.9×10^(4)~2.1×10^(5))条件,对弯管内气液两相流的压力和速度分布进行了深入剖析,并系统探究了压力损失随R/D、α以及Re_(l)的变化规律,最终得到了一定范围内L形弯管压力损失的最佳弯径比。结果表明,在Re_(l)=88 690的工况下,0.05 <α<0.3时,弯管的最佳弯径比约为2;在α=0.2的工况下,Re_(l)<29 856时,弯管的最佳弯径比约为1,Re_(l)=59 713~149 282时,弯管的最佳弯径比不断增大,Re_(l)> 179 139时,弯管的最佳弯径比约为4。In order to explore the optimal geometry of the elbow bend under the action of gravity,the pressure drop characteristics of the gas-liquid two-phase flow in the vertical L-shaped elbow were systematically studied by using the realizable k-εturbulence model combined with the Mixture two-phase flow model in Fluent.Specifically,the pressure and velocity distribution of the gas-liquid two-phase flow in the elbow were analyzed in detail for different bend diameter ratios R/D(R/D ranged from 1 to 7),gas phase volume ratesα(αranged from 0 to 0.3),and liquid phase Reynolds numbersRe_(l)(Re l ranged from 2.9×10^(4) to 2.1×10^(5)).In addition,the relationships between the local pressure drop with R/D,α,andRe_(l) were obtained.Finally,the optimal bend diameter ratios for the pressure drop of the L-shape elbow within a certain range of the above parameters were obtained.The results show that the optimal bend diameter ratio of the elbow was approximately 2 when 0.05<α<0.3 and Re_(l)=88690,and that it was approximately 1 whenα=0.2 and Re_(l)<29856.Moreover,the optimal bend diameter ratio was increased whenα=0.2 andRe_(l) ranged from 59713 to 149282,while that it was approximately 4 whenα=0.2 andRe_(l)>179139.

关 键 词：气液两相流 数值模拟 弯径比 液相雷诺数 气相体积率 

分 类 号：TV134.2[水利工程—水力学及河流动力学] O359.1[理学—流体力学]