椭圆缩放管换热性能数值分析  

Numerical analysis of heat transfer performance of elliptical convergent-divergent tube

作　　者：李慧君[1] 李东 LI Huijun;LI Dong(School of Energy Power and Mechanical Engineer,North China Electric Power University,Baoding 071003,China)

机构地区：[1]华北电力大学能源动力与机械工程学院,河北保定071003

出　　处：《压力容器》2022年第4期52-58,共7页Pressure Vessel Technology

摘　　要：为提高换热器性能,建立了不同长短轴比和扩缩比的椭圆缩放管几何模型,在雷诺数为12000~22000的范围内进行了数值模拟,以场协同数、努塞尔数、综合换热系数为评价指标,分析了椭圆缩放管的换热性能。结果表明:在扩缩比相同时,场协同数随着长短轴比的增加而增加,长短轴比为2时,场协同效果最好,在研究范围内,当雷诺数小于16000,长短轴比为2、扩缩比为1∶3时综合换热系数最大;雷诺数超过16000时,扩缩比为1∶1的综合换热能力更强。In order to improve the performance of heat exchanger,the geometric model of elliptical convergent-divergent tube with different aspect ratios and scaling ratio was established.The numerical simulation was carried out in the range of Reynolds number 12000~22000.The field synergy number,Nusselt number and comprehensive heat transfer coefficient were used as evaluation indexes to analyze the heat transfer performance of elliptical convergent-divergent tube.The results show that the field synergy number increases with the increase of the aspect ratios at the same scaling ratio.When the aspect ratio is 2,the field synergy effect is the best.In the research range,when the Reynolds number is less than 16000,the comprehensive heat transfer coefficient is the largest when the aspect ratios is 2 and the divergent segment-convergent segment ratio is 1∶3.When the Reynolds number is more than 16000,the comprehensive heat transfer capacity with scaling ratio of 1∶1 is stronger.

关 键 词：换热性能 椭圆缩放管 数值模拟 场协同理论 长短轴比 扩缩比 

分 类 号：TH49[机械工程—机械制造及自动化] TQ051.5[化学工程]