摘要
液压胀接的管翅式散热器在不同的胀接液压力加载条件下会导致铜管与翅片之间产生不同的界面贴合情况,从而对传热效率产生影响。为得到不同胀接压力对传热效率影响的规律,针对管翅式散热器单管模型提出了一种无损伤的检测方式。设置恒定的输入热流量对散热器单管进行加热,通过测量散热器单管表面温度分布情况计算散热器的实际散热量,从而得到整体传热效率。在仿真中对提出的检测方法原理和检测过程进行验证,仿真结果表明,在输入热流量为4 W并达到稳定状态时,铜管表面温度与实际使用温度相近,温度梯度只发生在轴向上,符合一维稳态传热。在胀接液压力为12 MPa~18 MPa时翅片与铜管能完成胀接并且保持完整连接,因此搭建测试平台对12 MPa、14 MPa、16 MPa、18 MPa胀接压力下的散热器进行传热效率检测,检测结果显示12 MPa~16 MPa间胀接压力和传热效率正相关,16 MPa~18 MPa由于翅片翻边破裂导致接触面积减少,传热效率降低。
Tube-fin heat exchangers with hydraulic expansion joints may experience varying interface conditions between copper tubes and fins,thus influencing the heat transfer efficiency under different expansion pressure loading conditions.To investigate the impact of different expansion pressures on heat transfer efficiency,a non⁃destructive detection method is proposed for a single tube model of the tube⁃fin heat exchanger.The proposed method involves subjecting the single tube of the heat exchanger to a constant input heat flux,and the actual heat dissipation of the heat exchanger is calculated based on the temperature distribution measured on the surface of the single tube.This allows the overall heat transfer efficiency to be determined.The theoretical principles and detection process of the proposed method are validated through simulations.The results indicate that at a stable input heat flux of 4 W,the temperature distribution along the copper tube surface is consistent with the actual operating temperature,and the temperature gradient only occurs along the axial direction,demonstrating one⁃dimensional steady⁃state heat transfer.At hydraulic expansion pressures ranging from 12 MPa to 18 MPa,the fins and copper tubes are capable of completing the expansion joint process while maintaining a sound connection.Therefore,a testing platform is established to evaluate the heat transfer efficiency of the heat exchanger under expansion pressures of 12 MPa,14 MPa,16 MPa,and 18 MPa.The test results reveal a positive correlation between expansion pressure in the range of 12 MPa to 16 MPa and heat transfer efficiency.However,at pressures between 16 MPa and 18 MPa,the heat transfer efficiency decreases due to fin edge folding and reduced contact area between the fins and copper tubes.
作者
吴孙丙
刘建伟
张文泽
马建平
何玉林
WU Sunbing;LIU Jianwei;ZHANG Wenze;MA Jianping;HE Yulin(Faculty of Mechanical&Electrical Engineering,Guilin University of Electronic Technology,Guilin Guangxi 541004,China;National Demonstration Center for Experimental Education of Mechanical and Electrical Engineering Training,Guilin University of Electronic Technology,Guilin Guangxi 541004,China;Guangxi Key Laboratory of Manufacturing System&Advanced Manufacturing Technology,Guilin University of Electronic Technology,Guilin Guangxi 541004,China)
出处
《机械设计与研究》
CSCD
北大核心
2024年第1期179-183,共5页
Machine Design And Research
基金
国家自然科学基金(52265044,52065014)
广西自然科学基金(2022GXNSFAA035586)资助项目
广西高校中青年教师科研基础能力提升项目(2023KY0220)。
关键词
空调散热器
液压胀接
传热效率
恒热流
表面散热
air⁃conditioning’s heat exchanger
hydraulic expansion
heat transfer efficiency
constant heat flux method
surface heat dissipation
