更高阶谐波表面镶嵌优化用于增材制造的空气-空气换热器
Optimization of Higher-Order Harmonic Surface Tessellations for Additively Manufactured Air-to-Air Heat Exchangers
AI总结：
本研究通过优化更高阶谐波传热表面结构，提升空气-空气换热器的热液压性能，尤其在湍流流动中表现出更高的效率和更低的压力损失。
摘要：
空气-空气换热器对于能量回收和热管理至关重要，但传统设计常面临效率降低、压力损失大和泵送功率增加的问题。增材制造技术的进步使仿生几何结构如晶格和三重周期最小曲面（TPMS）结构得以实现，这些结构通过复杂的一级表面增强传热，但常导致过大的压力损失。本研究提出了一种通过整合分析与数值方法的优化框架开发出的优化更高阶谐波传热表面镶嵌结构。目的是在各种操作条件下提高换热器的整体热液压性能。敏感性分析结果表明，此类二次表面修饰可使效率显著提升，最高可达70%，但伴随压力损失的增加。二次表面波频率被发现比振幅在实现高热液压性能中更为重要。此外，我们显示优化后的二级谐波型结构在湍流流动范围内（Re≥7000）相较于格子结构具有相对更高的效率和更低的压力损失。尽管格子TPMS结构在层流和弱湍流流动范围内具有相对更高的效率，但其伴随的压力损失显著高于谐波型结构。
英文摘要：
Air-to-air heat exchangers are vital for energy recovery and thermal management but often suffer from reduced effectiveness, high pressure losses, and increased pumping power in conventional designs. Advances in additive manufacturing have enabled nature-inspired geometries, such as lattice and triply periodic minimal surface (TPMS) structures, which enhance heat transfer through complex first-order surfaces but frequently cause excessive pressure drops. This study proposes an optimized higher-order harmonic heat-transfer surface tessellation developed through an optimization framework integrating analytical and numerical methods. The goal is to improve the overall thermal-hydraulic performance of the heat exchanger over a range of operating conditions. Results of sensitivity analysis show that secondary surface modification of this type can yield significant increase in the effectiveness reaching up to 70% although with associated increase in the pressure drop. The secondary surface wave frequency was found to be a more important control parameter than the amplitude in achieving high thermal-hydraulic performance. Additionally, we show that the optimized second order harmonic-type structure achieved relatively higher effectiveness and lower pressure-drop than the gyroid structure in the turbulent flow regime for Re>=7000. Although the gyroid TPMS structure had relatively higher effectiveness in the laminar and weakly turbulent flow regime, the associated pressure drop was found to be significantly higher than that of the harmonic-type structure.
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