摘要
为了对新型换热管的传热与流动性能进行优化分析,采用数值模拟和响应曲面法相结合的方法,以努塞尔数、阻力系数为响应,以换热管结构参数和流体速度为影响因子进行优化设计,确定最优的结构参数和流体的最佳入口速度。结果表明,多元回归模型可以准确地表示响应与因子之间的关系,因子显著性排序为线性项>平方项>交互项,单因子中速度和凸棱高度对响应努塞尔数和阻力系数的显著性最高。针对换热管优化设计得出交叉螺纹头数、凸棱高度、螺距、速度的最佳组合参数分别为6、0.56 mm、30 mm、15.856 m/s,其对应的努塞尔数和阻力系数分别为2 137.78、0.055 794,该组合可为再热器设计提供理论指导。
To optimize the heat transfer efficiency, a new heat exchange tube was designed and the flow characteristics were studied in which numerical simulation and response surface method were combined to respond to Nusselt number and drag coefficient, and the heat transfer tube structural parameters and fluid velocity were the influencing factors. The optimal structural parameters and optimal inlet velocity of the fluid were determined. Results show that the multivariate regression model could accurately represent the relationship between responses and factors, and the factor-synchronous ordering was: linear term > square term > interaction term. The velocity and rib height in single factor were most significant for the response Nusselt number and the drag coefficient. The optimal combination parameters of cross thread number, rib height, pitch, and velocity for the optimized design of the heat exchange tube were: 6, 0.56 mm, 30 mm, and 15.856 m/s, respectively, and the corresponding Nusselt number and the resistance coefficient were 2 137.78, and 0.055794, respectively. The parameters provide a theoretical guidance for reheater design.
作者
何仑
李永华
李瑞龙
张莎
杨少波
李广
HE Lun;LI Yong-hua;LI Rui-long;ZHANG Sha;YANG Shao-bo;LI Guang(School of Energy Power and Mechanical Engineering,North China Electric Power University,Baoding 071003,China;National Energy Group Lanzhou Thermal Power Co.,Ltd.,Lanzhou 730020,China)
出处
《科学技术与工程》
北大核心
2020年第11期4356-4362,共7页
Science Technology and Engineering
关键词
换热管
数值模拟
响应曲面法
显著性
结构优化
heat transfer tube
numerical simulation
response surface method
significance
structure optimization
