流体机械

2017, v.45;No.542(08) 19-23

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基于流固耦合的风力机叶片裂纹扩展机理研究
Study on Crack Growth Mechanism of Wind Turbine Blade Based on Fluid Solid Coupling

周勃;张亚楠;王琳琳;陈长征;
ZHOU Bo;ZHANG Ya-nan;WANG Lin-lin;CHEN Chang-zheng;Shenyang University of Technology;Liaoning Engineering Center for Vibration and Noise Control;

摘要(Abstract):

针对风力机工作环境的恶劣性以及风力机叶片裂纹扩展的复杂性,本文利用计算流体力学(CFD)和断裂力学仿真分析,以风力载荷作为裂纹扩展的主要载荷,利用流固耦合界面的数据传递对风力机叶片裂纹扩展机理进行仿真分析。在叶根表面嵌制一不同初始尺寸的半椭圆型三维裂纹,并在不同风速的条件下计算三维裂纹应力强度因子,分析不同初始尺寸裂纹在不同风速下的动态裂纹扩展机理。结果表明,裂纹的初始尺寸与风力载荷的大小均对叶片的裂纹扩展速率与方向产生影响,且在高风速下裂纹发生失稳扩展的几率增大。
In view of the severity of wind turbine working environment and the complexity of wind turbine blade crack growth. In this paper, by using computational fluid dynamics(CFD) and fracture mechanics simulation analysis, wind load is used as the main load of crack propagation, the mechanism of wind turbine blade crack propagation was simulated by data transfer problem of fluid solid coupling interface. A semi elliptical three-dimensional crack with different initial dimensions is embedded on the surface of the blade, and the stress intensity factor of three dimensional crack under different wind speeds is calculated. Dynamic crack growth mechanism of crack at different initial sizes under different wind speeds is analyzed. The results show that the initial size of the crack and the size of the wind load have effects on the crack propagation rate and direction of the blade, and the unsteady probability of crack growth under high wind speed increases.

关键词(KeyWords): 风力机叶片;流固耦合;三维裂纹;裂纹扩展
wind turbine blade;fluid structure interaction;three dimensional crack;crack propagation

Abstract:

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基金项目(Foundation): 国家自然科学基金项目(51575361);; 中国博士后科学基金项目(2014M560220);; 辽宁省百千万人才工程项目(2015049)

作者(Author): 周勃;张亚楠;王琳琳;陈长征;
ZHOU Bo;ZHANG Ya-nan;WANG Lin-lin;CHEN Chang-zheng;Shenyang University of Technology;Liaoning Engineering Center for Vibration and Noise Control;

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