| 环肋翅片管相变传热特性及分形优化 |
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| 引用本文： | 王玮琦,邢玉明,郑文远,郝兆龙.环肋翅片管相变传热特性及分形优化[J].北京航空航天大学学报,2022,48(12):2520-2528. |
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| 作者姓名： | 王玮琦 邢玉明 郑文远 郝兆龙 |
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| 作者单位： | 1.北京航空航天大学 航空科学与工程学院, 北京 100191 |
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| 基金项目： | 航空科学基金20172851018 |
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| 摘 要： | 基于管壳式相变换热器，通过数值模拟方法研究了35号石蜡在矩形环肋翅片管外的融化传热特性，建立肋片单元三维模型研究热流体温度、肋片高度参数对传热过程的影响，并探究了分形结构翅片的优化传热性能。结果表明:矩形环肋翅片管外相变融化过程分为传热速率差异明显的3段，适用于不同功率需求；提高热流体入口温度和相变材料温差近似等比增强总传热功率；肋片高度由10 cm分别提高至12.5 cm、15 cm时，总融化时间分别缩短42.89%、71.96%，增强传热，但功率重量比降低；分形结构优化翅片总融化时间缩短41.95%，功率提高，为相变翅片管的优化设计提供参考。
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| 关 键 词： | 相变换热器 数值模拟 环肋翅片 分形理论 强化传热 |
| 收稿时间： | 2021-03-25 |
Phase change heat transfer characteristics and fractal optimization of radial plate fin tube |
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| Affiliation: | 1.School of Aeronautic Science and Engineering, Beihang University, Beijing 100191, China2.Aviation Key Laboratory of Science and Technology on Aero Electromechanical System Integration, Nanjing 211106, China |
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| Abstract: | Based on the shell and tube phase change heat exchanger, the melting heat transfer characteristics of 35 paraffin outside the rectangular radial plate fin tube were studied by numerical simulation method. The three-dimensional model of fin element was established to study the influence of thermal fluid temperature and fin height parameters on the heat transfer process, and the heat transfer performance of optimal fractal fin was explored. The results show that the melting process can be divided into three stages with different heat transfer rates, which are suitable for different power requirements. Increasing the inlet temperature of the hot fluid and the temperature difference of the phase change material can enhance the total heat transfer power approximately in equal proportion. When the fin height is increased from 10 cm to 12.5 cm and 15 cm, the total melting time is reduced by 42.89% and 71.96%, and the heat transfer is enhanced, but the power to weight ratio is reduced. The total melting time is reduced by 41.95% with fractal structure optimization and the power is increased, which provides a reference for the optimal design of phase change finned tube. |
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