摘要
针对现有螺旋折流板换热器在相邻两块折流板的直边对接处形成三角区漏流而降低换热器换热性能的问题,提出了一种旋梯式螺旋折流板换热器,即旋梯式折面折流板由一块大平板经过两次弯折后形成,其中两平面与管束轴线垂直,另一平面与两平面的夹角（折弯角）相同。对旋梯式螺旋折流板换热器的结构进行了计算流体力学模拟优化,结果表明：利用折面板结构及直边重叠特点,消除了三角区漏流,改善了壳程流场,使得换热器壳程流体流动更接近于螺旋流,换热得以强化;折弯度为0.3、切割百分数为90%、折弯角为37°时,旋梯式螺旋折流板换热器综合性能最优,换热器热性能因子提高了28.4%~30.7%,平均增加了29.9%。该结果可为螺旋折流板换热器的节能优化提供参考。
An improved structure of heat exchangers with ladder-type fold baffle is proposed to eliminate the triangular leakage zones between two adjacent baffles of conventional heat exchangers with helical baffle. The improved ladder-type fold baffle is formed by folding one plane twice, which consists of three planes, two of which are perpendicular to the tube bundle axis, and the third plane keeps the same angle with the other two planes. The configuration of the ladder-type fold baffle is optimized with CFD simulation. The results show that the triangular leakage zones are eliminated due to the folded plane structure and the overlap between two adjacent straight edges of ladder-type fold baffles. The shell-side flow field is improved significantly, which forms a continuous spiral flow in shell side of the improved heat exchanger, hence heat transfer in the heat exchanger is strengthened. When the hend degree is taken as 0.3, the cutting percentage as 90% and the bend angle as 37%, the overall performance of heat exchanger reaches the best. The thermal performance factor rises by 28.4%-30. 7%, or 29.9% on an average.
出处
《西安交通大学学报》
EI
CAS
CSCD
北大核心
2014年第11期8-14,共7页
Journal of Xi'an Jiaotong University
基金
国家自然科学基金资助项目(51106119
81100707)
教育部博士点基金资助项目(20110201120052)
"十二五"国家科技支撑计划资助项目(2012BAA08B03)
中央高校基本科研业务费专项资金资助项目
关键词
旋梯式螺旋折流板换热器
结构优化
三角漏流
换热强化
heat exchanger with ladder-type helical baffles
configuration optimization
triangularleakage
heat transfer enhancement
