宽雷诺数下肋参数对U型内冷通道流动与换热特性影响的实验研究  

Experimental Study on Flow and Heat Transfer Characteristics of U-Type Cooling Channels with Different Rib Turbulators within a Wide Reynolds Number Range

作　　者：万红牛 丁俣中 程想 陈黎[1] 王进[2] 冀文涛[1] 陶文铨[1] WAN Hongniu;DING Yuzhong;CHENG Xiang;CHEN Li;WANG Jin;JI Wentao;TAO Wenquan(Key Laboratory of Thermo-Fluid Science and Engineering of MOE,Xi’an Jiaotong University,Xi’an 710049,China;School of Energy and Environmental Engineering,Hebei University of Technology,Tianjin 300401,China)

机构地区：[1]西安交通大学热流科学与工程教育部重点实验室,西安710049 [2]河北工业大学能源与环境工程学院,天津300401

出　　处：《西安交通大学学报》2024年第6期103-113,共11页Journal of Xi'an Jiaotong University

基　　金：国家科技重大专项资助项目(J2019-Ⅲ-0007-0050);王宽诚青年学者项目

摘　　要：为了研究肋高和通道高的比值(e/H)、肋间距与肋高的比值(P/e)以及肋角度(α)对U型带肋通道流动与换热特性的影响,采用铜板法结合热电偶测量壁面温度分布,对6个不同肋参数U型带肋通道的表面换热特性进行了实验研究。带肋通道截面为正方形,实验的Re为5.0×10^(3)~1.0×10^(5)。研究结果表明,随着e/H和Re的增大,带肋通道的对流换热系数逐渐增大,但相应的流动损失增幅明显,e/H从0.08增大到0.12时,通道的阻力系数增大了近一倍。对于e/H=0.08的通道,P/e分别为6、8、10时,P/e为8时的对流换热系数和阻力损失均高于其他两种情况。相较于90°正交肋,带角度的斜肋能够进一步增强带肋通道的对流换热,75°肋的强化效果略强于60°肋。在实验参数范围内,对于几种不同的带肋U型通道,对流换热系数为光滑通道的1.9~3.0倍,阻力系数为光滑通道的4~16倍。综合考虑换热与流阻,e/H=0.08、P/e=8、α=45°的通道性能最好。In order to study the influence of rib height to channel height ratio(e/H),rib spacing to rib height ratio(P/e)and rib angle(α)on the flow and heat transfer characteristics of ribbed U-type channels,the channel wall surface temperature distribution is measured using copper plate method combining thermocouple.Experimental study of the heat transfer characteristics on the surface of ribbed U-type channel with 6 different rib parameters is carried out.The ribbed channel has a square cross section,and the Reynolds number in this experiment is from 5.0×10^(3) to 1.0×10^(5).The experimental results show that with the increase of the e/H and Reynolds number,the convective heat transfer coefficient of the ribbed channel gradually increases,but the corresponding pressure loss increases significantly.As the e/H increases from 0.08 to 0.12,the friction factor of the channel almost doubles.For channel with e/H=0.08,among the three cases with the P/e being 6,8,and 10,the convective heat transfer coefficient and pressure loss are highest when the ratio is 8.The angled rib can further enhance the convective heat transfer in ribbed channels compared to the 90°orthogonal rib.Additionally,the 75°rib is slightly more effective than the 60°rib.Within the experimental parameter range,the convective heat transfer coefficient is 1.9-3.0 times that of the smooth channel,and the drag coefficient is about 4-6 times that of the smooth channel.Considering heat transfer and flow resistance comprehensively,under the conditions of e/H=0.08,P/e=8,andα=45°,the thermal performance is the best.

关 键 词：涡轮叶片 内部冷却 带肋通道 对流换热 

分 类 号：TK47[动力工程及工程热物理—动力机械及工程]