本文从传热传质和流体压降的角度开展了液氢供给系统中的空温式换热器设计计算和流动换热性能数值仿真。构建了跨临界换热过程换热及压降关联式，提出空温式换热器的温度区间离散设计新方法，在设计工况及相关约束条件下完成空温式换热器整体结构参数设计。建立了换热器三维流动传热数值仿真模型，对模型进行合理简化，开展不同工况下空温式换热器模拟仿真研究，获得空温式换热器换热过程中流体温度、压降及换热管路温度等参数的变化规律。结果表明，在空温式换热器实际运行工况下，本文所设计空温式换热器能够完成液氢工质的自增压及气化需求，通过将设计计算工况与实际运行工况进行对比，发现换热器中自增压器和汽化器的翅片之间存在换热干涉现象，为空温式换热器的实际工程设计提供指导。

The ambient temperature heat exchanger within the liquid hydrogen supply system underwent a comprehensive analysis encompassing heat exchanger design calculations and numerical simulations targeting heat and mass transfer dynamics alongside fluid pressure drop characteristics. In the domain of heat exchanger design, we established a correlation between heat transfer phenomena and pressure drop behaviors pertinent to transcritical heat transfer processes. An innovative discrete temperature interval design methodology was introduced for ambient temperature heat exchangers, culminating in the holistic determination of structural parameters under designated conditions and constraints. Leveraging the outcomes of the heat exchanger design calculations, a judicious simplification of the model was conducted, paving the way for the establishment of a three-dimensional numerical simulation model elucidating fluid flow heat transfer dynamics. This computational framework facilitated simulation studies encompassing various operational scenarios of ambient temperature heat exchangers and water bath gasifiers, thereby elucidating the temporal evolution of key parameters such as fluid temperature, fluid pressure drop, and heat exchanger tube temperature during heat transfer processes. Analysis of the results revealed that the designed ambient temperature heat exchanger effectively fulfills requirements pertaining to self-pressurization and gasification under real-world operating conditions. Furthermore, comparative analyses between design calculation scenarios and actual operational conditions unveiled instances of heat transfer interference between the ambient temperature self-pressurizer and the fins of the ambient temperature gasifier, thereby offering invaluable insights for the practical engineering refinement of ambient temperature heat exchanger designs.

TK02

国家重点研发计划(No.2021YFB4001605)