四叶孔支撑板换热器壳程流态及其传热机制研究  

Flow Pattern and Heat Transfer Mechanism on Shell Side of Heat Exchanger with Quatrefoil-Hole Baffle

作　　者：宫本希[1,2] 王昊 邢继远[1] 王丹 王珂[1] GONG Benxi;WANG Hao;XING Jiyuan;WANG Dan;WANG Ke(Key Laboratory of Process Heat Transfer and Energy Saving of Henan Province, Zhengzhou University, Zhengzhou 450002, China;Zhengzhou Branch of China Nuclear Power Engineering Company, Ltd., Zhengzhou 450052, China)

机构地区：[1]郑州大学河南省过程传热与节能重点实验室,郑州450002 [2]中国核电工程有限公司郑州分公司,郑州450052

出　　处：《西安交通大学学报》2020年第6期148-154,共7页Journal of Xi'an Jiaotong University

基　　金：国家自然科学基金资助项目(51776190);河南省教育厅高等学校重点科研基金资助项目(18A470005)。

摘　　要：为了研究四叶孔支撑板换热器壳程的流体流动和传热性能,利用CFD软件建立了周期性全截面的数值模型,研究了换热器壳程流体的流动形态及四叶孔板的间距和开孔高度对换热器壳程热工性能的影响。利用激光多普勒测速仪(LDV)测量了四叶孔支撑板换热器壳程特殊点的轴向流速,将数值计算结果与实验结果进行对比,验证了数值模拟计算的可靠性。研究结果表明:换热器壳程流体总体呈纵向流动,四叶孔支撑板对其可以产生明显的射流作用;流体在通过第1块支撑板后,其流速具有明显的周期性;随着支撑板间距和开孔高度的减小,换热器壳程传热系数和压降均增大,而其综合性能降低,四叶孔板间距和开孔高度对壳程压降的影响程度强于对换热性能的影响;在雷诺数Re为10000~30000的范围内,得到了换热器壳程努塞尔数Nu和压降的实验关联式,两者计算偏差都在±10%以内。本文的数值模型及结果对于核电站系统中换热器的设计和应用提供了指导。The fluid flow pattern in the shell side of a heat exchanger and the influence of the baffle pitch and the height of the quatrefoil-hole on the thermal-hydraulic performance are studied,a periodic whole-section numerical model is built by CFD software to investigate the characteristics of fluid flow and heat transfer in the shell side of heat exchanger with quatrefoil-hole baffle.A velocity test in a heat exchanger with quatrefoil-hole baffle is carried out,and the axial velocities of some special points in the shell side are measured by the Laser Doppler Velocimeter(LDV).Numerical results are compared with the experimental results to verify the reliability of the numerical calculation.The results show that the fluid flow in the shell side of the heat exchanger flows longitudinally,an obvious jet comes into being behind the baffle,and the velocity of the fluid has a significant periodicity after passing through the first support baffle.Both the heat transfer coefficient and the pressure drop in the shell side increase with the decrease of the baffle pitch and the hole height,but the comprehensive performance decreases.The influence of the baffle pitch and the hole height on the pressure drop is stronger than that on the heat transfer.Within Reynolds number range from 10000 to 30000,the experimental correlations for Nusselt number and pressure drop in the shell side of the heat exchanger are obtained,and the calculation deviation of both correlations are within±10%.The numerical model and results in this paper provide guidance for the design and application of the heat exchangers in the nuclear power plants.

关 键 词：换热器 四叶孔支撑板 激光多普勒测速仪 实验关联式 

分 类 号：TK124[动力工程及工程热物理—工程热物理]