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Numerical study on the operating characteristics of cryogenic loop heat pipes based on a one-dimensional heat leak model

机译：基于一维热泄漏模型的低温回路热管运行特性的数值研究

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摘要

The cryogenic loop heat pipe is an effective and reliable heat transfer system in the space technology. A global model of cryogenic loop heat pipe is developed by full consideration of the subcooled effect and the mass flow rate variation of the working fluid along the evaporator core. The heat leak is calculated on the basis of onedimensional temperature distributions in the evaporator core. The calculation of the proposed model improves the prediction accuracy relative to traditional zero-dimensional models. The effects of filling pressure, parasitic heat load, auxiliary heat load, and use of bayonet on the CLHP performance are investigated. A normal "U shape" of the evaporating temperature curve appears at a low filling pressure (1.45 MPa). At moderate and high filling pressures (1.465 MPa and 1.5 MPa, respectively), two new evaporating temperature curves with "flat bottom U-shape" and "L-shape", which shows the unique operating characteristics of cryogenic loop heat pipes, are found, The two new profiles are attributed to the coupling of mass and energy between gas reservoir and primary compensation chamber. The determinant factor for the minimum working heat load is the void fraction of the primary compensation chamber. By contrast, the maximum working heat load is determined by the void fraction at a low filling pressure (below 1.4 MPa) and the maximum capillary pressure at a high filling pressure (above 1.4 MPa). The use of a bayonet can decrease the maximum vapor quality in the evaporator core and effectively avoid burnout.
机译：低温回路热管是航天技术中有效而可靠的传热系统。通过充分考虑过冷效应和沿蒸发器芯的工作流体的质量流量变化，开发了低温回路热管的全局模型。根据蒸发器芯中的一维温度分布来计算热泄漏。相对于传统的零维模型，所提出模型的计算提高了预测精度。研究了填充压力，寄生热负荷，辅助热负荷以及刺刀的使用对CLHP性能的影响。在较低的填充压力（1.45 MPa）下，蒸发温度曲线呈正常的“ U形”。在中等和较高的填充压力（分别为1.465 MPa和1.5 MPa）下，发现两条新的蒸发温度曲线，分别为“平底U形”和“ L形”，显示了低温回路热管的独特工作特性。 ，这两个新的轮廓归因于储气罐和主补偿腔之间的质量和能量耦合。最小工作热负荷的决定因素是主补偿室的空隙率。相反，最大工作热负荷由低填充压力（低于1.4 MPa）下的空隙率和高填充压力（高于1.4 MPa）下的最大毛细管压力决定。使用刺刀会降低蒸发器芯中的最高蒸汽质量，并有效避免燃尽。

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  • 来源
    《Energy Conversion & Management》 |2018年第9期|485-496|共12页
  • 作者

    Qu Z. G.; Chen G.; Zhou L.; Miao J. Y.;

  • 作者单位

    Xi An Jiao Tong Univ, Sch Energy & Power Engn, MOE Key Lab Thermal Fluid Sci & Engn, Xian 710049, Shaanxi, Peoples R China;

    Xi An Jiao Tong Univ, Sch Energy & Power Engn, MOE Key Lab Thermal Fluid Sci & Engn, Xian 710049, Shaanxi, Peoples R China;

    Xi An Jiao Tong Univ, Sch Energy & Power Engn, MOE Key Lab Thermal Fluid Sci & Engn, Xian 710049, Shaanxi, Peoples R China;

    Beijing Inst Spacecraft Syst Engn, Beijing Key Lab Space Thermal Control Technol, Beijing 100094, Peoples R China;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Cryogenic loop heat pipe; Heat leak; Operating characteristics; Bayonet;

    机译：低温回路热管;热泄漏;运行特性;卡口;

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