摘要
针对蓄冰盘管管路长压降大等问题,对蓄冰盘管结冰和流动特性进行了模拟分析和结构优化,分析了管内流体不同流速时U形管外的结冰情况。为减小蓄冰槽整体管内压力降,在U形管与分水管连接处采用顺流布置的折流弯,针对改进的折流弯部分,建立了物理模型,并对不同曲率半径弯管的管内流动压降和管外结冰进行了分析。结果表明,流速对U形管内传热效果的影响很大,但在蓄冰量一定时,流速存在上限,在流速大于0.4 m/s时,结冰速率不再增加;曲率半径从10 mm增大到30 mm时,压降减小了11.7%,从30 mm增大到50 mm,压降减小了5.5%,曲率半径在50~60 mm之间压降存在极小值;曲率半径为30 mm的弯管结冰速率最快,比曲率半径40 mm的结冰速率增加2%左右,比曲率半径为20 mm的增加47%左右,因此推荐30 mm曲率半径。研究结果可为冰蓄冷装置的设计提供参考。
For the problem of large pressure drop in the long ice storage coil pipe,the icing and flow characteristics of the ice storage coil pipe were simulated and analyzed,and the structure was optimized.The icing on the outside of U-shaped coil was analyzed.In order to reduce the pressure drop in the whole pipe of the ice storage tank,a downstream bend was adopted at the connection between the U-shaped pipe and the water diversion pipe. For the improved bend,a physical model was established,and the flow pressure drop and icing on the outside of the bends with different curvature radius were analyzed.The results show that the flow velocity has a great influence on the heat transfer effect in the U-shaped pipe,but there is an upper limit for the flow velocity when the ice storage capacity is constant,and when the flow velocity is greater than 0.4 m/s,the icing rate no longer increases.When the radius of curvature increases from 10 mm to 30 mm,the pressure drop decreases by 11.7%,and when the radius of curvature increases from 30 mm to 50 mm,the pressure drop decreases by 5.5%.There is a minimum pressure drop when the radius of curvature is between 50 mm and 60 mm;The bend with a radius of curvature of 30 mm has the fastest icing rate,which is about 2% higher than the bend with a radius of curvature of 40 mm,and about 47% higher than the bend with a radius of curvature of 20 mm. Therefore,a radius of curvature of 30 mm is recommended. The research results provide a reference for the design of ice storage device.
作者
杨肖
杨冬梅
王启扬
刘杨
杨波
黄伽锐
邹同华
YANG Xiao;YANG Dongmei;WANG Qiyang;LIU Yang;YANG Bo;HUANG Jiarui;ZOU Tonghua(NARI Group State Grid Electric Power Research Institute Co.,Ltd.,Nanjing 211100,China;School of mechanical engineering,Tianjin University of Commerce,Tianjin 300134,China)
出处
《流体机械》
CSCD
北大核心
2022年第10期98-104,共7页
Fluid Machinery
基金
国家重点研发计划项目(2021YFE0116103)
2020年国网公司总部科技项目(5419-202019385A-0-0-00)。
关键词
冰蓄冷
结冰
压降
结构优化
折流弯
ice storage
icing
pressure drop
structure optimization
deflection bend
