| 冯志鹏,齐欢欢,蔡逢春.基于流管模型的流动扰动数值表征及流弹失稳预测[J].计算力学学报,2025,42(2):322~328 |
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| 基于流管模型的流动扰动数值表征及流弹失稳预测 |
| Numerical characterization of flow perturbation and prediction of fluidelastic instability based on flow cell model |
| 投稿时间：2023-09-16 修订日期：2023-12-06 |
| DOI：10.7511/jslx20230916003 |
| 中文关键词: 流致振动 流弹失稳 流管模型 流动扰动 管束结构 |
| 英文关键词:flow induced vibration fluid-elastic instability flow cell model flow perturbation tube bundle |
| 基金项目:四川省自然科学基金(2022NSFSC1182)资助项目. |
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| 摘要点击次数: 8 |
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| 中文摘要: |
| 为了提升流管模型的预测能力和适用范围,获得能定量表征其众多流动扰动参数的通用方法,通过理论推导建立经典流管模型的动力学方程,基于二维流固耦合模拟发展流动扰动参数辨识方法,研究流管的面积分布、速度分布、压力分布(均包括稳态项、相位差、扰动项)规律,然后以相位差函数为例,将其数学表达式作为流管模型的基本输入参数进行集成,预测管束结构的流弹失稳行为。结果表明,本文方法成功获得了众多流动扰动参数与曲线坐标及时间的关系,流动扰动参数的稳态项与曲线坐标的函数为正弦形式,相位差与曲线坐标的函数关系为线性形式;预测的临界流速与实验值吻合良好,证明了结合流动扰动数值表征和流管模型基本假设预测流弹失稳的可行性,为流弹失稳预测模型的开发提供了可行途径。 |
| 英文摘要: |
| In order to improve the predictive ability and applicability of the flow-cell model,and obtain a universal method that can quantitatively characterize its numerous flow perturbation parameters,the dynamic equation of the classical flow-cell model is established through theoretical derivation.Based on two-dimensional fluid-structure interaction simulation,a flow perturbation parameter identification method is developed to study the area perturbation,velocity perturbation,and pressure perturbation(including steady-terms,phase difference,and perturbation terms) of the flow-cell.Then,taking the phase difference function as an example,its mathematical expression is integrated as the basic input parameter of the flow-cell model to predict the fluidelastic instability behavior of the tube bundle.The results show that the proposed method has successfully obtained the relationships between flow perturbation parameters and curve coordinates and time.The steady-terms of the flow perturbation with the curvilinear coordinates are in sine form,and the relationship between the phase difference and the curvilinear coordinates is in linear form.The predicted critical velocity is in good agreement with the experimental values,proving the feasibility of combining numerical characterization of flow perturbation and basic assumptions of flow-cell models to predict fluid-elastic instability,and providing a feasible approach for the development of fluidelastic instability models. |
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