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<p>Addressing the issue of sealing failure in liquid hydrogen triple-offset butterfly valves within rocket fuel delivery systems under ultra-low temperature conditions due to insufficient cold shrinkage compensation capability, this paper first proposes a soft-sealing elastic compensation structure. Its sealing performance is evaluated using a thermo-mechanical coupling method. Secondly, sensitivity analysis using the Spearman method identifies key optimization variables: radial offset distance <i>D</i><sub><i>e</i></sub>, third offset angle <i>α</i>, sealing surface width <i>B</i>, and sealing surface interference <i>T</i>. The optimization objectives are the maximum contact stress <i>P</i><sub>1max</sub> and average contact stress <i>P</i><sub>1ave</sub> during forward sealing, and the maximum contact stress <i>P</i><sub>2max</sub> and average contact stress <i>P</i><sub>2ave</sub> during reverse sealing. Finally, an optimal Latin hypercube sampling method is used to construct the sample space, and a high-precision RBF surrogate model combined with the NSGA-II algorithm is employed to find excellent Pareto front solutions. After optimization, the Maximum contact stress of the butterfly valve sealing structure during forward sealing decreased by 23.43%, and the average contact stress decreased by 22.41%; during reverse sealing, the Maximum contact stress increased by 51.07%, and the average contact stress increased by 48.83%. The optimized butterfly valve sealing structure achieves reliable bidirectional sealing under liquid hydrogen ultra-low temperature conditions.</p>

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Structural analysis and multi-objective optimization of sealing structure for cryogenic liquid hydrogen triple-offset butterfly valve

  • 期刊论文

  • 出版模式：

    开放获取

  • 发表日期：

    2025年10月15日

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  • Shuxun Li,
  • Bojiang Yin,
  • Cong Wei,
  • Wei Li,
  • Lingxia Yang

摘要

Addressing the issue of sealing failure in liquid hydrogen triple-offset butterfly valves within rocket fuel delivery systems under ultra-low temperature conditions due to insufficient cold shrinkage compensation capability, this paper first proposes a soft-sealing elastic compensation structure. Its sealing performance is evaluated using a thermo-mechanical coupling method. Secondly, sensitivity analysis using the Spearman method identifies key optimization variables: radial offset distance De, third offset angle α, sealing surface width B, and sealing surface interference T. The optimization objectives are the maximum contact stress P1max and average contact stress P1ave during forward sealing, and the maximum contact stress P2max and average contact stress P2ave during reverse sealing. Finally, an optimal Latin hypercube sampling method is used to construct the sample space, and a high-precision RBF surrogate model combined with the NSGA-II algorithm is employed to find excellent Pareto front solutions. After optimization, the Maximum contact stress of the butterfly valve sealing structure during forward sealing decreased by 23.43%, and the average contact stress decreased by 22.41%; during reverse sealing, the Maximum contact stress increased by 51.07%, and the average contact stress increased by 48.83%. The optimized butterfly valve sealing structure achieves reliable bidirectional sealing under liquid hydrogen ultra-low temperature conditions.