【摘要】 随着增材制造技术的发展，复杂拓扑换热结构的精确构建和快速成形成为可能，为实现高效、紧凑、轻量化换热器提供了新的设计思路，其中三周期极小曲面（Triply Periodic Minimal Surfaces,TPMS）因具有连续光滑的通道形态、高比表面积与结构自支撑特性，在紧凑式换热器设计中展现出显著优势，为提升先进核能系统的换热效率提供了潜在途径。然而，不同几何构型与孔隙率对氦氙混合气体流动换热特性的影响规律仍不明确。为此，本研究以氦氙混合工质为研究对象，通过实验数据对比，获得了适用于氦氙低普朗特数流体的湍流普朗特数模型，利用TPMS结构的空间周期性，在流向建立了Gyroid(G)和Fischer-Koch S(FKS)两种TPMS构型的单通道模型，并开展了氦氙工质在不同构型和孔隙率的TPMS换热器中的流动换热特性数值模拟研究，旨在揭示TPMS构型与孔隙率对氦氙流动传热性能的影响。结果表明，在相同孔隙率下，FKS构型的比表面积比G构型高70%以上，其更大的换热面积使传热效率提升超过25%。孔隙率变化对TPMS换热器流动换热特性具有双重影响：随着孔隙率增大，流体通道体积增加，换热面积也随之增大，但流速下降限制了对流换热效率的提升，同时流动阻力显著降低；相反，降低孔隙率增加固体体积分数，流体流速提升，提高壁面剪切作用和局部湍流动能，但固体热阻和流动阻力也随之增大。不同几何构型对孔隙率变化的敏感性不同，这一结果表明，孔隙率的选择需要综合考虑流动阻力与换热效率的平衡。本研究揭示了Gyroid与FKS两种TPMS构型在不同孔隙率下氦氙工质的流动换热规律，可以为氦氙TPMS增材制造换热器设计提供定量指导和选型建议。更多还原

【Abstract】 Additive manufacturing enables precise fabrication of complex topological heat transfer structures, supporting compact and lightweight heat exchanger design. Triply Periodic Minimal Surfaces(TPMS) offer smooth channels, high surface area, and self-supporting geometry, which are advantageous for advanced nuclear systems. The effects of geometry and porosity on helium-xenon heat transfer remain unclear. A turbulence Prandtl number model suitable for low-Prandtl-number helium-xenon flow was developed from experimental data. Single-channel models of Gyroid(G) and Fischer-Koch S(FKS) structures were constructed to study flow and heat transfer behavior under different porosities. Numerical results showed that, at the same porosity, the FKS structure had an over 70% larger surface area and over 25% higher heat transfer efficiency than the G structure. Increasing porosity enlarged the channels and reduced pressure loss but weakened convection, while decreasing porosity enhanced shear and turbulence but increased resistance. The results clarify how TPMS geometry and porosity influence thermal performance and provide guidance for additive-manufactured heat exchanger design.更多还原