流体介质作用下新制三偏心真空蝶阀阀体动态失稳临界载荷分析

doi:10.13385/j.cnki.vacuum.2026.03.15

摘要/Abstract

摘要： 在真空系统中介质压力脉动与阀板开度的动态耦合会严重威胁系统的真空密封性,加剧阀体的应力分布不均匀及变形,进而降低阀体的失稳载荷。因此,文章分析了流体介质作用下新制三偏心真空蝶阀阀体动态失稳临界载荷。基于ANSYS Workbench平台,建立三维参数化模型,进行真空/低压流体介质（150℃水蒸气,克努森数范围0.003~0.1,滑移流区）非定常流动与阀体结构间的双向流固耦合（FSI）计算。在流体域中,采用k-ω SST湍流模型精确模拟复杂流动特性,计算流体作用力分布。在结构域中,基于弧长法进行几何非线性屈曲分析,精准捕捉阀体在流体作用力下的失稳行为,绘制位移-载荷曲线,确定介质压力脉动与阀板开度动态耦合下的失稳临界载荷。结果表明：300 Hz介质压力脉动与阀板90°开度耦合工况下,阀体动态失稳临界载荷最低,仅为3×10³ Pa,失稳风险最高,容易导致密封失效和真空度破坏。

关键词: 真空密封, 新制三偏心真空蝶阀, 最大失稳载荷, k-ω SST湍流模型, 弧长法

Abstract: The dynamic coupling effect of medium pressure pulsation and valve plate opening in vacuum systems seriously threatens the vacuum sealing integrity of the system, exacerbates the uneven stress distribution and deformation of the valve body, and thereby affects the instability load of the valve body. Therefore, the critical load of dynamic instability of the newly made three eccentric vacuum butterfly valve body is analyzed under the action of fluid medium. Based on the ANSYS Workbench platform, a three-dimensional parametric model is established to perform bidirectional fluid structure coupling (FSI) calculations between the unsteady flow of vacuum/low-pressure fluid medium (150℃ water vapor, Knudsen number 0.003-0.1, slip flow zone) and the valve body structure. In the fluid domain, the k-ω SST turbulence model is used to accurately simulate complex flow characteristics and calculate the distribution of fluid forces. In the structural domain, geometric nonlinear buckling analysis is performed based on the arc length method to accurately capture the instability behavior of the valve body under fluid forces, draw displacement load curves, and determine the critical load of instability under the dynamic coupling of medium pressure pulsation and valve plate opening. The results show that, under the dynamic coupling condition of 300 Hz medium pressure pulsation and valve plate 90° opening, the critical load for dynamic instability of the valve body is the worst, only 3×10³ Pa, and the risk of instability is the highest, which can easily lead to seal failure and vacuum degree damage.

Key words: vacuum sealing, triple eccentric vacuum butterfly valve, maximum unstable load, k-ω SST turbulence model, arc-length method

中图分类号: TP53.27

付炎杰, 闵林锋. 流体介质作用下新制三偏心真空蝶阀阀体动态失稳临界载荷分析[J]. 真空, 2026, 63(3): 104-110.

FU Yanjie, MIN Linfeng. Critical Load Analysis of Dynamic Instability of Valve Body for a Newly Made Three Eccentric Vacuum Butterfly Valve Under the Action of Fluid Medium[J]. VACUUM, 2026, 63(3): 104-110.

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