Journal of Shandong University(Engineering Science) ›› 2025, Vol. 55 ›› Issue (6): 69-75.doi: 10.6040/j.issn.1672-3961.0.2024.327

• 能动工程——热管理专题 • Previous Articles     Next Articles

Numerical investigation on the operating instability of neon charged cryogenic loop heat pipes

HE Falong1,2, DU Wangfang2,3*, MIAO Jianyin4, ZHANG Hongxing4, HE Jiang4, LIU Sixue4, LIU Chang4, ZHAO Jianfu2,3   

  1. HE Falong1, 2, DU Wangfang2, 3*, MIAO Jianyin4, ZHANG Hongxing4, HE Jiang4, LIU Sixue4, LIU Chang4, ZHAO Jianfu2, 3(1. School of Energy and Safety Engineering, Tianjin Chengjian University, Tianjin 300384, China;
    2. Key Laboratory of Microgravity, Institute of Mechanics, Chinese Academy of Sciences, Beijing 100190, China;
    3. School of Engineering Science, University of Chinese Academy of Sciences, Beijing 100049, China;
    4. National Key Laboratory of Spacecraft Thermal Control(Beijing Institute of Spacecraft System Engineering), Beijing 100094, China
  • Published:2025-12-22

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Abstract: Cryogenic loop heat pipes(CLHPs), as efficient two-phase heat transfer systems for the cryogenic temperature range, have been widely used in many engineering applications both on the ground and in space. The operational stability of CLHPs directly influenced the performance of the thermal control system. In this study, a system-level transient model was employed to conduct transient simulations on the operational stability of a neon-charged CLHP(Ne-CLHP). The phenomena and causes of pressure and operating temperature oscillations in the Ne-CLHP were simulated and investigated. The gas-liquid distribution characteristics inside the key components of the system during the instability process were analyzed in detail. Combined with the temperature-pressure drop phase diagram, the instability mechanism was examined, which revealed four distinct operating states—stable operation, oscillation attenuation, oscillation amplification, and periodic oscillation—that occurred under different operating conditions of the CLHP.

Key words: cryogenic temperature, loop heat pipe, temperature oscillation, instability, transient model

CLC Number: 

  • TK121
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