冲击射流下旋转热管砂轮冷凝器传热特性  

Heat Transfer Characteristics of Condensers in Rotating Heat Pipe Grinding Wheel under Impinging Jet

作　　者：张立勇 陈佳佳 姜华飞 徐幼林[1] Zhang Liyong;Chen Jiajia;Jiang Huafei;Xu Youlin(College of Mechanical and Electronic Engineering,Nanjing Forestry University,Nanjing,210037,China)

机构地区：[1]南京林业大学机械电子工程学院,南京210037

出　　处：《制冷学报》2023年第2期94-103,共10页Journal of Refrigeration

基　　金：国家自然科学基金(51905275)资助项目。

摘　　要：轴向旋转热管砂轮是用于强化磨削弧区换热的新型砂轮,其冷凝器换热性能的优劣直接影响整个热管砂轮的换热性能。本文结合冷凝器设计方法设计了热管砂轮冷凝器,并借助数值模拟的方法对轴向旋转热管砂轮冷凝器的换热性能进行分析,以优化旋转热管砂轮冷凝器的结构参数。研究不同的翅片高度(f=0~8 mm)、喷嘴到翅片顶部距离(d=3~11 mm)、低温空气射流速度(v_(j)=45~115 m/s)和砂轮转速(n=150~1180 r/min)等对冷凝器换热性能的影响,结果表明:当翅片高度为6 mm时,获得最佳传热性能,对流换热表面传热系数约为459 W/(m^(2)·K),与无翅片结构相比,对流换热表面传热系数提高36%;当喷嘴到翅片顶部距离为5 mm时,换热性能最好,传热系数为459 W/(m^(2)·K);当低温空气射流速度提高时,对流换热表面传热系数随之提高,射流速度为115 m/s时对流换热表面传热系数最高,可达459 W/(m^(2)·K),与射流速度为45 m/s时相比提高43%;当砂轮转速提高,对流换热表面传热系数也随之升高,砂轮转速为1180 r/min时对流换热表面传热系数最高,达到459 W/(m^(2)·K),与150 r/min时相比提高4%。An axial rotary heat pipe grinding wheel is a new type of grinding wheel used to strengthen the heat transfer in the grinding arc area.Its heat transfer performance directly affects the heat transfer performance of the entire heat pipe grinding wheel.In this study,the condenser of the heat pipe grinding wheel was designed in conjunction with the condenser design method,and the heat transfer performance of the axial rotating heat pipe grinding wheel condenser was analyzed using a numerical simulation model to optimize the structural parameters of the condenser of the rotating heat pipe grinding wheel.The effects of different fin heights(f=0-8 mm),nozzle-to-fin top distances(d=3-11 mm),low-temperature air jet velocities(v_(j)=45-115 m/s),and grinding wheel speeds(n=150-1180 r/min)on the heat transfer performance of the condenser were investigated.The results showed that the best heat transfer coefficient of 459 W/(m^(2)·K)was obtained when the fin height was 6 mm,in which the convective heat transfer coefficient was increased by 36%compared with the finless structure.The best heat transfer performance was obtained when the distance from the nozzle to the top of the fin was 5 mm,and the heat transfer coefficient was 459 W/(m^(2)·K).When the low-temperature air jet velocity increases,the convective heat transfer coefficient increases.The highest heat transfer coefficient is achieved at a jet velocity of 115 m/s,up to 459 W/(m^(2)·K),which is 43%higher compared to the jet velocity of 45 m/s.When the grinding wheel speed increases,the convective heat transfer coefficient also increases.The highest heat transfer coefficient is achieved at a speed of 1180 r/min,up to 459 W/(m^(2)·K),which is 4%higher than the speed of 150 r/min.

关 键 词：传热系数 冷凝器 旋转热管砂轮 冲击射流 

分 类 号：TB611[一般工业技术—制冷工程] TK124[动力工程及工程热物理—工程热物理] TK172[动力工程及工程热物理—热能工程]