摘要
鉴于研究水翼的流固耦合过程可为水力机械动态特性预测提供基础,通过workbench软件中的SYSTEM COUPLING模块对水翼模型进行双向流固耦合模拟。结果表明,流速达到"锁止区"前后固有频率的跳跃性变化在不同区域存在不同的线性关系;对比圆拟合法与尖峰法求得的阻尼比,发现模型的锁止区流速在10~12m/s之间,而固有频率和阻尼比的变化规律与试验结果基本吻合;同时研究了水翼攻角变化时的激振特点,当攻角超过10°时,会产生明显的尾流旋涡现象。
The study of fluid-solid coupling process of hydrofoil can provide a basis for predicting dynamic characteristics of hydraulic machinery.In this paper,the system coupling module in the workbench was employed to simulate twoway fluid-solid coupling of the hydrofoil model.The results show that there are different linear relationships in different regions when the velocity of flow approaches the’lock zone’.By comparing the damping ratio obtained by circle fitting method and spike method,it is found that the locking region of the model is between the flow velocity region of 10~12 m/s,and the variation of natural frequency and damping ratio is basically consistent with the experimental results.Meanwhile,the characteristics of hydrofoil were studied.When the attack angle exceeds 10°,there will be obvious wake vortex phenomenon.
作者
郭俊勋
周大庆
陈小翠
陈会向
GUO Jun-xun;ZHOU Da-qing;CHEN Xiao-cui;CHEN Hui-xiang(a.College of Energy and Electrical Engineering,Hohai University,Nanjing 211100,China;College of Agricultural Science and Engineering,Hohai University,Nanjing 211100,China)
出处
《水电能源科学》
北大核心
2021年第6期144-148,共5页
Water Resources and Power
基金
国家自然科学基金项目(51979086,51839008)。
关键词
双向流固耦合
阻尼比
固有频率
涡量
two-way fluid-solid coupling
damping ratio
natural frequency
vorticity
