交错搭接螺旋折流板换热器壳程流动与传热的场协同分析  

Field Synergy Analysis on Shell-side Flow and Heat transfer of Heat Exchanger With Staggered Overlap Helical Baffles

作　　者：汲水[1] 杜文静[1] 王鹏[1] 程林[1] 

机构地区：[1]山东大学热科学与工程研究中心,山东省济南市250061

出　　处：《中国电机工程学报》2011年第20期75-80,共6页Proceedings of the CSEE

基　　金：国家重点基础研究发展计划项目(973项目)(2007CB206900)~~

摘　　要：采用数值模拟方法研究了同螺距下折流板搭接量对壳程流动传热的影响。结果表明,随搭接量增大,同流量下壳程换热系数和压降均降低;三角区漏流减轻局部阻力减小,同时边缘三角区漏流加强了壳体附近区域流体的轴向和旋转流动;中心换热管的换热量急剧下降,靠近壳体换热管的变化不大。场协同分析表明,三角区漏流促进换热而边缘三角区漏流削弱换热;随搭接量的增大壳程速度场与热流场的整体协同性得到改善。Numerical investigation was carried out to study the effects of overlap size on shell-side flow and heat transfer characteristics of heat exchanger with helical baffles under the same helix pitch. Results show that, with the increase of overlap size, both convection heat transfer coefficient and pressure drop decrease; leakage from triangle zone mitigates, local flow resistance decreases, leakage from marginal triangle zone enhances the axial and rotating flow at the region closed to shell; the heat transfer on the central tube drop sharply, the heat transfer on the tube close to shell vary slightly. Field synergy analysis shows that, the leakage from triangle zone enhances heat transfer, the leakage from marginal zone impairs heat transfer. The bigger overlap size, the better global field synergy between flow field and heat flux field.

关 键 词：螺旋折流板 交错搭接 螺旋角 换热器 流动阻力 场协同 

分 类 号：TK124[动力工程及工程热物理—工程热物理]