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采用旋转机械应力应变无线遥测技术,在直流式低速风洞开口段对风力机叶片运行状态中的应力应变特性进行了实验研究,结果表明:在相同尖速比下,叶片各截面沿展向向外位置增加应变值逐渐减小,随着风速的增加,压力面的应变值增加幅度大于吸力面,叶根处应变增加幅度大于叶尖,并在0.55R到0.75R段应变拟合曲线略微凸起,主要是气动力在该截面区作用的效果;在相同风速下,叶片各截面沿展向向外位置增加应变值逐渐减小,且各截面的应变值随着尖速比的增加而增大,叶根较叶尖增加幅值更明显,叶根部位所受离心力增加较快;相同翼面处前缘点的应变值大于后缘点的应变值。为开展大型风力发电机组叶片动态应变检测积累了可鉴借的经验。
The stress-strain wireless telemetry technology of rotating machinery is used to study the stress-strain characteristics of wind turbine blades in the open section of the low-speed direct-flow wind tunnel. The results show that under the same tip speed ratio, As the wind speed increases, the strain of the pressure surface increases more than that of the suction surface. The increase of strain at the blade root is larger than that of the blade tip. The curve of strain at 0.55R to 0.75R is slightly convex The effect of aerodynamic forces acting on the cross-section is mainly attributed to the fact that the strain values of each cross-section of blades along the outward direction increase gradually with the same wind speed, and the strain values of each cross-section increase with the increase of tip speed ratio The root and root amplitude increased more obviously than the blade tip, and the centrifugal force at the blade root increased rapidly. The strain at the front edge of the same airfoil was greater than that at the trailing edge. In order to carry out large-scale wind turbine blade dynamic strain detection can learn from the experience of Kam.