气液耦合涡流的动力学建模与振动演化机理  

Dynamic modeling and vibration evolution mechanism of the gas-liquid coupled vortex flow

作　　者：方可沁 蔡建平 FANG Keqin;CAI Jianping(College of Electrical and New Energy,China Three Gorges University,Yichang 443002,China;Zhejiang Zheneng Huaguangtan Hydroelectric Power Generation Co.,Ltd.,Hangzhou 311322,China;College of Electrical Engineering,Zhejiang University of Water Resources and Electric Power,Hangzhou 310018,China)

机构地区：[1]三峡大学电气与新能源学院,湖北宜昌443002 [2]浙江浙能华光潭水力发电有限公司,浙江杭州311322 [3]浙江水利水电学院电气工程学院,浙江杭州310018

出　　处：《宁波大学学报(理工版)》2025年第1期45-53,共9页Journal of Ningbo University:Natural Science and Engineering Edition

摘　　要：潮汐能电站运行过程中水电能量转换的稳定性至关重要.低水头水电站容易产生气液耦合涡流(Gas-liquidCouplingVortexFlow,GCVF),形成不规则的随机激波振动,严重破坏水轮机的性能和输入流的稳定性.GCVF临界贯穿状态识别对于提高水电转换效率和设备寿命至关重要,但是由于气液耦合输运和流体非线性激励,GCVF冲击振动特征检测仍面临重大挑战.为此,提出一种基于水平集和Flügge壳体理论的流固耦合建模与求解方法,揭示GCVF临界贯穿状态下的冲击振动演化机理.基于水平集方法和Flügge双向流固耦合原理,建立GCVF冲击振动动力学模型,并结合动态网格技术优化流固耦合求解过程,探究GCVF临界贯穿过程的输运规律和振动演变机理.结果表明,该模型能够较好地揭示GCVF临界贯穿状态下的动态演化规律,GCVF冲击振动表现出随机能量峰值和复杂的非线性脉冲特征.To meet the increasing electricity demand,hydropower energy conversion stability is essential in the operation process of tidal power plants.A low-head hydropower station can easily produce gas-liquid coupling vortex flow(GCVF)and form irregular shock wave vibrations,seriously damaging turbine performance and input flow stability.Identifying the critical penetration state is crucial to improving the hydropower conversion efficiency and equipment lifetime.However,the detection of GCVF shock vibration characteristics still faces significant challenges due to the gas-liquid coupled transport and the nonlinear excitation of fluid.To solve the above problems,this paper proposes a fluid-structure coupling modeling and solution method,based on the level set and Flügge shell theory,to reveal the GCVF shock vibration evolution mechanism under the critical penetration state.Based on the level set method and Flügge bidirectional fluid-structure coupling principle,the GCVF shock vibration dynamic model is set up.Dynamic mesh technology is utilized to optimize the fluid-structure coupling solution process,based on which the transport law and vibration evolution mechanism of the GCVF critical penetration process are obtained.Research results demonstrate that the proposed model and method can well reveal the GCVF evolution regularities in the critical penetration state,and the GCVF shock vibration is capable of showing the energy peak and complex nonlinear pulse characteristics.

关 键 词：气液耦合涡流 流固耦合 振动特征 临界贯穿状态 水电能源转换 

分 类 号：TV744[水利工程—水利水电工程]