为改进换热器内螺旋传热元件的振动均匀性及提高换热器的综合传热性能，提出一种带有螺旋折流板的中空换热器，采用双向流固耦合计算方法，研究了入口流速及折流板安装位置对换热器振动及传热特性的影响。结果表明：带螺旋折流板的中空换热器可有效均衡振动特性，提高传热特性。增加入口流速，传热元件振动幅值和换热系数增大。折流板安装在换热器上部时，平均振动幅值最大，平均传热系数最小，传热均匀性最好。带螺旋折流板中空换热器的PEC值大于1，实现了强化传热的效果，折流板安装在换热器的下部、上部、左部和右部时换热器的PEC值比传统螺旋弹性管束换热器的PEC值分别提高了2.04%、7.87%、1.32%和0.03%，折流板安装在上部时PEC值最大，综合传热性能最好。
Abstract
A hollow helical baffle (HHB) heat exchanger was put forward to balance the vibration performance and improve the heat transfer performance of helical heat transfer element. The fluid-solid coupling method was provided to study the effects of entrance velocity and the installed position of baffle on the performances of vibration and heat transfer. Based on the numerical results, HHB heat exchanger can effectively balance the vibration performance and improve the heat transfer performance. The vibration amplitude and heat transfer coefficient of heat transfer elements increase with the increase of entrance velocity. It is found that when the baffle is installed on the top side of the heat exchanger, the average vibration amplitude is the biggest, the average heat transfer coefficient is the smallest and the heat transfer uniformity is the best. The PEC value of HHB heat exchanger is always bigger than 1 which shows that the HHB heat exchanger has achieved the effect of enhancing heat transfer. When the baffle is installed on the bottom, top, left and right side of HHB heat exchanger, the PEC value of HHB heat exchanger can be increased by 2.04%, 7.87%, 1.32% and 0.03% compared with that of the conventional elastic tube bundle (CETB), respectively. When the baffle is installed on the top side of the HHB heat transfer, the PEC value is the maximum and the comprehensive heat transfer performance is the best.
关键词
传热元件 /
换热器 /
螺旋折流板 /
振动特性 /
传热特性
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Key words
heat transfer element /
heat exchanger /
helical baffle /
vibration performance /
heat transfer performance
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