横纹槽管结构优化的正交数值模拟试验研究

运用正交试验法设计了横纹槽管结构优化的试验，试验运用数值模拟方法进行，采用标准K-ε方程湍流模型和速度分布两层模型进行模拟计算，研究了横纹槽管结构参数e/d，p/d, a/e和流动Reynolds数对热阻力性能的影响.试验结果表明：在试验参数范围内，影响横纹槽管综合传热性能的主要结构参数为肋节距p/d和肋形a/e，而肋高e/d影响较小，并且传热综合因子随流动Reynolds数增大而迅速降低.通过分析正交试验结果，提出了较佳横纹槽管管型.

Shape optimization of transversely-ridged tube by orthogonal numerical simulation test

The experimental scheme of shape optimization of transversely-ridged tube was planned by orthogonal test.The turbulent flow and heat transfer inside every experimental tube were numerically simulated by considering constant property, periodically developed flow and uniform wall temperature. Simulation was conducted by the standard K-ε turbulent model and velocity two-layer zonal model. The numerical results were validated with experimental data or classical data for transversely-ridged tube and smooth tube respectively.η, Nu/Nu_s and f/f_s were presented for every experimental case.The effects of the shape parameters—e/d，p/d, a/e of transversely-ridged tube and the flow parameter—Reynolds number on the thermal-hydraulic performance were analyzed.The results showed that pitch—p/d and rib shape——a/e were the predominant configuration factors and rib height——e/d was not as important as the former ones within the experimental range. The heat transfer efficiency index was found to be strongly influenced by Reynolds number,decreasing sharply with increasing Reynolds number.The optimum configuration was brought forward by analyzing the results of orthogonal test.