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流固耦合输流管系统的动力学分析及参数影响

Keywords: 流固耦合,输流管,模态,固有频率,非定常流动

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Abstract:

为了探究航天器供能系统中输流管系统的动力学问题,建立了输流弯管的有限元模型,并进行流固耦合模态分析,研究了输流管壁厚、管径及弯角角度对其固有频率的影响.另一方面,选取星载质子交换膜燃料电池系统中的一段输流管,进行非定常流输流管动力学响应分析,研究了阀门安装位置和壁厚对管道动位移和应力值的影响.数值结果表明:流固耦合作用降低了输流管的固有频率,随着输流管壁厚的增大,输流管固有频率逐渐增大,输流管管径和弯角角度对输流管的低阶固有频率影响较小,但对高阶固有频率有较大影响;流体的非定常流动会导致管壁动位移值和应力值产生突变,管道动位移幅值和应力幅值受阀门安装位置影响很小,但出现应力极值的位置随其变化而变化;随着输流管壁厚的增加,输流管动位移幅值和应力幅值减小.

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