大型板式换热器流体阻力特性试验研究  

Test Study of Fluid Resistance Pressure Drop Character for Large Plate Heat Exchanger

作　　者：杨璋[1,2] 蒋彦龙[1] 王合旭 孙程斌 

机构地区：[1]南京航空航天大学航空宇航学院 [2]福建宁德核电有限公司

出　　处：《电站系统工程》2017年第2期1-4,共4页Power System Engineering

摘　　要：测试大型液-液无相变人字板式换热器不同板型、不同板片数样机的流体阻力性能,研究准则方程式法计算换热器压降与实测压降的关系。利用大型流体阻力测试装置搭建试验台,根据国标要求测试板片数分别为7片和99片,板型分别为高效-高效型、低效-低效型、高效-低效型时样机的流体阻力特性,结果显示样机板型不变板片数增多时,压降随流量增大而增加;样机板片数不变仅板型不同时,压降比基本稳定。实测某国产大型混装人字板式换热器不同流量下的压降,并与不同样机所得欧拉-雷诺准则方程计算的理论压降进行比较,发现样机板片数为7片时偏差大且不稳定;样机板片数为99片时,偏差小且稳定。偏差来源于板片间流速的不均匀分布,样机板片数与产品实际板片数相差太多时,不适于用雷诺-欧拉准则方法计算理论压降。The plate heat exchanger＇s theoretical and measured pressure drops were reached by testing fluid resistance pressure character as to different No. of plates and different herringbone models for large liquid-liquid plate heat exchanger. A large experimental bench was established, which used to test fluid resistance pressure drops by highly active-highly active, lowly active-lowly active and highly active-lowly active templates as to different No. of plates equal to 7 or 99. It was found that pressure drops increase by fluid flow rate increase when models has more plates but the same template, and pressure drop＇s ratio keep steady when only exist different corrugation angle but the same plate number. When compare pressure drops between the tested value and theoretical calculated value basing on Euler-Reynolds equation method, the deviation was large and instability as to 7 plate model, but deviation was minute and steady. The deviation results from the heterogeneous distribution velocity field between plate and plate by numerical calculation. When the model has fewer plates than practice plate heat exchanger product, the method of Euler-Reynolds equation isn＇t suitable for pressure drop calculation.

关 键 词：板式热交换器 流体阻力 欧拉-雷诺准则 

分 类 号：TK16[动力工程及工程热物理—热能工程]