管翅式换热器胀接参数对换热器性能的影响  

Effect of expanding parameter on the performance of fin and tube heat exchanger

作　　者：贾甲[1] 李炅[1] 钟志锋 程立权[1] 蔡松素[1] 袁旭东[1] 张成 Jia Jia1 , Li Jiong1 , Zhong Zhifeng2, Cheng Liquan1, Cai Songsu1, Yuan Xudong1 ,Zhang Cheng1(1. Hefei General Machinery Research Institute , Hefei 230088, China; 2. Foreign Economic Cooperation Office, Ministry of Environmental Protection, Beijing 10035, Chin)

机构地区：[1]合肥通用机械研究院,合肥230088 [2]环境保护部环境保护对外合作中心,北京10035

出　　处：《低温与超导》2018年第3期64-68,共5页Cryogenics and Superconductivity

摘　　要：对于管翅式换热器,铜管与翅片接触热阻占到换热器总热阻的10%—20%,并且随着翅片热疲劳的加剧,接触热阻不断增大。通过对不同胀接工艺参数的管翅式换热器换热量进行测试,分析得出胀接工艺参数胀头直径对换热器性能的影响。运用数值计算及可视化试验方法,从局部特性分析胀接对管翅接触状态和管内内螺纹形变的影响。结论如下:胀头直径过小会出现欠胀问题,管与翅片胀接程度达不到要求,会影响换热器性能;胀头直径过大会出现过胀现象,接触间隙大大增加且损伤内螺纹齿,同样会降低翅片换热器的换热性能。Thermal contact resistance between tube and fin accounts for 10% to 20% of the total thermal resistance for the fin and tube heat exchanger, and it will increase with fin thermal fatigue exacerbating. By the test for the fin and tube heat ex- changer capacity at different welding parameters, impact of expansion process on the performance of the heat exchanger was obtained. Visualization and numerical simulation method were also used to analyze the contact state between tube and fin and dam- age of inner pipe thread for the expansion. The conclusion is if expansion head diameter is too small, connection of the fin and the tubes is not up to the requirements, the performance of heat exchanger will be affected. And if expansion head diameter is too large, contact gap will increase and internal thread teeth will be damaged, performance of the heat exchanger will also decrease.

关 键 词：胀接 换热性能 试验 数值计算 可视化 

分 类 号：TK172[动力工程及工程热物理—热能工程]