摘要
为研究虾米腰弯管内流场分布,改善管内流场均匀性,采用Realizable k-ε模型对加装导流板前后的弯管内湍流二次流动进行三维数值模拟研究。结果表明:虾米腰弯管内未布置导流板时,在流体转弯后水平直管段出现较大范围的低速区,同时出现回流现象,气流分布极不均匀且阻力损失较大。布置导流板后,能有效改善弯管内流体的流动特性并降低系统能量损失。分析不同数量、不同结构、不同布置方式的导流板对弯管内流场均匀性、进出口压降的影响,提出虾米腰弯管内导流板最优布置方式为:导流板的数量为3块、中心角为60°、导流板均靠后布置。
In order to study the distribution of the flow field and improve the uniformity of the flow field in a shrimp-waist bend,a series of three-dimensional numerical simulation studies on the turbulent secondary flow in a bend before and after the installation of the deflector was carried out by using the Realizable k-εmodel.The results showed that when the deflector was not arranged in the shrimp-waist bend pipe,a large range of low-speed zones appeared in the horizontal straight pipe section after the fluid turns,and a backflow phenomenon occured at the same time.The airflow distribution was extremely uneven and the pressure resistance was large.After the deflector was arranged,the flow characteristics of the fluid in the elbow were effectively improved and the energy loss of the system was reduced.Based on the analysis of the influence of different number,structure and arrangement of deflectors on the uniformity of flow field and pressure drop loss of the bend,the optimal arrangement of deflectors in the shrimp-waist bend was proposed as follows:the number of deflectors was 3,the deflectors′center angle was 60°,and the deflectors were all arranged backward.
作者
祁金胜
曹洪振
石岩
杜文静
王湛
QI Jinsheng;CAO Hongzhen;SHI Yan;DU Wenjing;WANG Zhan(Shandong Electric Power Engineering Consulting Institute Corporation,Jinan 250013,Shandong,China;School of Energy and Power Engineering,Shandong University,Jinan 250061,Shandong,China)
出处
《山东大学学报（工学版）》
CAS
CSCD
北大核心
2020年第5期64-69,76,共7页
Journal of Shandong University（Engineering Science）
关键词
弯管
流场优化
阻力损失
导流板
数值模拟
elbow
flow field optimization
resistance loss
deflector
numerical simulation
