【摘要】 为了研究管程旋流强化中换热器的性能，设计了一种适合气体流动的旋流元件安装于换热器的管程换热管入口处。通过RNG k-ε模型进行了数值研究，对不同参数旋流结构和换热器入口流量为30～50 m~3/h的条件进行研究，并模拟结果进行换热器的设计和实验系统的搭建。结果表明：加入旋流元件可以使流动趋于均匀进入各换热管，旋流元件对换热管近壁面处速度提升明显，总体传热系数提高了76.1%～135.9%，压降增加约5.7%～19.5%，旋流元件的加入使得换热器以较小的压力损失的情况下获得较高的换热系数。对其螺旋角度（14°、18°、26°）、长度（32 mm、48 mm、64 mm）以及叶片宽度（8 mm、10 mm、12 mm）进行分析，得到α=18°，L=48 mm,W=10 mm时，换热器效果为最佳。更多还原

【Abstract】 In order to study the performance of heat exchangers in tube side swirl enhancement, a swirl element suitable for gas flow was designed and installed at the inlet of the tube side heat exchange tube of the heat exchanger. Through RNG k-ε A numerical study was conducted on the model to investigate the conditions of different swirl structures and inlet flow rates of 30～50 m~3/h for heat exchangers, and the simulation results were used for the design of heat exchangers and the construction of experimental systems. The results showed that the addition of swirl elements could make the flow tend to be uniform and enter each heat exchange tube. The swirl element significantly improved the velocity near the wall of the heat exchange tube, and the overall heat transfer coefficient increased by 76.1%～135.9%, with a pressure drop increase of about 5.7%～19.5%. The addition of swirl elements enabled the heat exchanger to achieve a higher heat transfer coefficient with minimal pressure loss. The spiral angles(14 °, 18 °, 26 °), lengths(32 mm, 48 mm, 64 mm), and blade widths(8 mm, 10 mm, 12 mm) were analyzed. The optimal performance of the heat exchanger was achieved, When α=18 °, L=48 mm,and W=10 mm.更多还原