基于流固耦合理论的螺旋折流板换热器结构优化研究

发布时间：2018-04-11 09:46

  本文选题：螺旋折流板换热器 + 流固耦合　； 参考：《高校化学工程学报》2017年03期

【摘要】：针对螺旋折流板换热器热-结构综合性能,以螺旋角和搭接度为优化变量,基于流固耦合理论,采用二阶多项式响应面模型和遗传算法对螺旋折流板换热器进行了结构优化研究。结果表明:当壳侧入口流量为1.5 m×s~(-1)时,对于流动传热性能,单位压降传热系数随螺旋角的增大呈现先增大后减小的趋势,随搭接度的增大而减小,且受螺旋角的影响更大;对于折流板机械强度性能,最大剪应力的最大值随着螺旋角的增大而增大,而基本不受搭接度的影响。多目标优化以单位压降传热系数最大化,最大剪应力的最大值在许用应力范围内且最小化为目标函数,得到了三种优化结构。对比优化前后,单位压降传热系数平均提升了14.1%,最大剪应力的最大值平均降低了4.1%。研究结果为螺旋折流板换热器的工业化设计提供了理论指导。
[Abstract]:Based on the theory of fluid-solid coupling, the helical angle and the degree of overlap are taken as the optimal variables for the thermal structure comprehensive performance of the helical baffle heat exchanger.The second order polynomial response surface model and genetic algorithm were used to optimize the structure of helical baffle heat exchanger.The results show that when the inlet flow rate of shell side is 1.5 m 脳 s-1), the heat transfer coefficient of unit pressure drop increases first and then decreases with the increase of spiral angle, and decreases with the increase of lap degree, and is more affected by spiral angle.For the mechanical strength of baffle plate, the maximum shear stress increases with the increase of spiral angle, but is not affected by the degree of overlap.In order to maximize the heat transfer coefficient per unit pressure drop, the maximum shear stress is minimized within the allowable stress range, and three kinds of optimization structures are obtained.Before and after optimization, the heat transfer coefficient per unit pressure drop increased by 14.1and the maximum shear stress decreased by 4.1.The results provide theoretical guidance for the industrial design of helical baffle heat exchangers.
【作者单位】： 西安交通大学化学工程与技术学院;西安交通大学能源与动力工程学院;
【基金】：国家自然科学基金(51676146)
【分类号】：TQ051.5
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本文编号：1735463