绕水翼空化流动及振动特性的试验与数值模拟
发布时间：2019-04-10 11:56
【摘要】：采用试验与数值模拟相结合的方法,对不同材质水翼的空化水弹性响应及其振动特性进行了分析.试验中,采用高速摄像技术观测不同空化阶段的空穴形态,应用多普勒激光测振仪测量水翼的振动速度.采用k-ωSST湍流模型和Zwart空化模型对流场进行数值模拟,并建立两自由度结构模型,基于混合耦合算法实现流固耦合数值模拟计算.试验结果表明,水翼的振动幅度在云状空化阶段达到最大,水翼的振动主频与空泡脱落频率一致,并随空化数减小而降低.数值预测结果与试验结果吻合较好,能较准确地捕捉附着型空穴的生长、脉动以及云状空穴的断裂脱落过程,主要振动频率与相应空泡脱落频率一致.受水翼弹性变形和结构水弹性响应的影响,弹性材料水翼吸力面的空泡发展更为复杂,空泡脱落过程伴随着大尺度空泡团的二次附着与脱落,且空泡团容易发生破碎,形成水气混合状,其结构振动特性和流激振动频谱成分也更加复杂.
[Abstract]:The cavitation hydroelastic response and vibration characteristics of hydrofoil with different materials are analyzed by means of experiment and numerical simulation. In the experiment, high-speed camera technology was used to observe the shape of holes in different cavitation stages, and Doppler laser vibrometer was used to measure the vibration velocity of hydrofoil. The k-蠅-SST turbulence model and the Zwart cavitation model are used to simulate the flow field, and the two-degree-of-freedom structure model is established. The fluid-solid coupling numerical simulation is realized based on the hybrid coupling algorithm. The experimental results show that the vibration amplitude of the hydrofoil reaches its maximum in the cloud cavitation stage. The main vibration frequency of the hydrofoil is consistent with that of the cavitation shedding frequency, and decreases with the decrease of the cavitation number. The numerical prediction results are in good agreement with the experimental results, and can accurately capture the growth, pulsation and fracture and shedding processes of the attached holes, and the main vibration frequencies are consistent with the corresponding cavitation shedding frequencies. Influenced by the elastic deformation of hydrofoil and the hydroelastic response of the structure, the development of cavitation on the suction surface of hydrofoil is more complicated. The process of cavitation shedding is accompanied by the secondary attachment and shedding of large-scale bubble clusters, and the cavitation clusters are prone to fragmentation. The structure vibration characteristics and flow-induced vibration spectrum components are more complex because of the formation of water-gas mixture.
【作者单位】： 北京理工大学机械与车辆学院;
【基金】：国家自然科学基金资助项目(51306020) 四川大学水力学与山区河流开发保护国家重点实验室开放课题
【分类号】：O35
，
本文编号：2455776
[Abstract]:The cavitation hydroelastic response and vibration characteristics of hydrofoil with different materials are analyzed by means of experiment and numerical simulation. In the experiment, high-speed camera technology was used to observe the shape of holes in different cavitation stages, and Doppler laser vibrometer was used to measure the vibration velocity of hydrofoil. The k-蠅-SST turbulence model and the Zwart cavitation model are used to simulate the flow field, and the two-degree-of-freedom structure model is established. The fluid-solid coupling numerical simulation is realized based on the hybrid coupling algorithm. The experimental results show that the vibration amplitude of the hydrofoil reaches its maximum in the cloud cavitation stage. The main vibration frequency of the hydrofoil is consistent with that of the cavitation shedding frequency, and decreases with the decrease of the cavitation number. The numerical prediction results are in good agreement with the experimental results, and can accurately capture the growth, pulsation and fracture and shedding processes of the attached holes, and the main vibration frequencies are consistent with the corresponding cavitation shedding frequencies. Influenced by the elastic deformation of hydrofoil and the hydroelastic response of the structure, the development of cavitation on the suction surface of hydrofoil is more complicated. The process of cavitation shedding is accompanied by the secondary attachment and shedding of large-scale bubble clusters, and the cavitation clusters are prone to fragmentation. The structure vibration characteristics and flow-induced vibration spectrum components are more complex because of the formation of water-gas mixture.
【作者单位】： 北京理工大学机械与车辆学院;
【基金】：国家自然科学基金资助项目(51306020) 四川大学水力学与山区河流开发保护国家重点实验室开放课题
【分类号】：O35
，
本文编号：2455776
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