基于响应曲面法的新型换热管结构优化

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。

Structural Optimization of a New Heat Exchange Tube Based on Response Surface Methodology

In order to optimize the heat transfer and flow characteristics of the new heat exchange tubes, the combination of numerical simulation and response surface method is used to respond to Nusselt number and drag coefficient, and the heat transfer tube structural parameters and fluid velocity are the influencing factors. Optimized design to determine optimal structural parameters and optimal inlet velocity of the fluid. The results show that the multivariate regression model can accurately represent the relationship between responses and factors, factor-synchronous ordering: linear term > square term > interaction term, The velocity and rib height in the single factor are 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 are: 6, 0.56 mm, 30 mm, 15.856 m.s^-1, and their corresponding Nusselt number and The resistance coefficient is 2 137.78, 0.055 794.The combination provides theoretical guidance for Reheater design.