Abstract
This study presents the thermal-hydraulic optimization of the design parameters of a parallel-flow shell-and-tube heat exchanger with a new type of anti-vibration hexagon clamping baffle and equilateral triangle cross-sectioned coiled wire. A periodic flow unit duct with non-staggered tube layout is adopted as the numerical analysis model by Fluent. The Taguchi method is used to explore the influence of five geometric parameters including baffle distance (A), baffle width (B), coil diameter (C), coil pitch (D), and the side length of the equilateral triangle (E). An L18 (35) orthogonal array is chosen to carry out the numerical simulation. The comprehensive thermal-hydraulic performance evaluation criterion (PEC) is set as the optimization goal. The results show that the order of the factor effectiveness for the Nusselt number is E>C>A>D>B, for the flow friction is C>E>A>B>D and for the PEC is C>E>A>B>D. This means that the coil pitch has a great influence while the baffle width and the coil diameter have a trifling effect. Finally, the optimal factor combination for PEC is obtained. The PEC of the optimal combination is 0.19%–1.92% higher than the model with better comprehensive performance among 18 cases for Reynolds number in the range from 14 465 to 32 547.
摘要
目 的
圆形折流杆管壳式换热器容易发生流体诱发振动, 从而引起管束失效。 本文旨在探索壳程采用正三角形截面的线圈和六边形防振折流板的平行流换热器的传热特性和传热强化机理。
创新点
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1.
提出一种具有防振功能的带六边形折流板和正三角形截面螺旋线圈的平行流管壳式换热器;
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2.
采用田口方法揭示几何参数对传热和流动性能的影响;
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3.
以提高换热器的综合性能为目标函数, 得出最优的几何参数组合。
方 法
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1.
采用数值模拟方法和田口方法, 分析带六边形防振折流板和正三角形截面线圈的平行流换热器几何参数对传热流动特性的影响;
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2.
综合对比分析速度、 压力、 温度和湍流场分布的影响, 揭示传热强化机理。
结 论
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1.
得到了不同几何参数对传热和流动的影响程度; 其中, 线圈的节距对传热和流动的影响程度最大, 而六边形夹持防振折流板厚度的影响最小。
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2.
采用田口方法优化后的结构较原结构的综合 性能提高0.19%~1.92%。
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Project supported by the National Science and Technology Major Project of the Ministry of Science and Technology of China (No. 2010ZX06004-013) and the Specialized Research Fund of the Postdoctoral Program of the Dongfang Boiler Group Co., Ltd., China
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Yu, Cl., Ren, Zw., Zeng, M. et al. Parameters optimization of a parallel-flow heat exchanger with a new type of anti-vibration baffle and coiled wire using Taguchi method. J. Zhejiang Univ. Sci. A 19, 676–690 (2018). https://doi.org/10.1631/jzus.A1700385
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DOI: https://doi.org/10.1631/jzus.A1700385