Structural analysis and multi-objective optimization of sealing structure for cryogenic liquid hydrogen triple-offset butterfly valve
Year: 2025
Type: article
Abstract: 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 D e , third offset angle α , sealing surface width B , and sealing surface interference T . The optimization objectives are the maximum contact stress P 1max and average contact stress P 1ave during forward sealing, and the maximum contact stress P 2max and average contact stress P 2ave 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.
Source: Scientific Reports
Authors: Shuxun Li, Bojiang Yin, Cong Wei, Wei Li, Lingxia Yang
Institution: Lanzhou University of Technology
Language: English
Subfield: Aerospace Engineering
Field: Engineering
Domain: Physical Sciences
Open Access status: gold
Estimated APC paid: $2,690
Award: 高压降多级降压疏水阀流体激振与内部非定常流动机理研究
OpenAlex ID: W4415248292