A series of full scale experimental wind tunnel tests were performed to determine the aerodynamic loading behaviour on the airfoils of a high solidity, low rotational velocity, 3 bladed H-type vertical axis wind turbine. The primary vibration response was resonance excitation of the dominant whirling mode of the turbine. However, for a significant number of test cases, resonance behaviour was also observed in the bending strains of the airfoil support struts, primarily corresponding to higher natural frequencies. Furthermore, under various test conditions, vibration amplitude within the support struts was observed to change dramatically during a single test run, suggesting that the vibration was jumping between sets of airfoil support struts in a complex beating mode. In order to isolate the numerous vibration excitation and response behaviours, tests were performed over a range of flow velocities from 8 m/s to 11 m/s with two different support shaft end conditions.
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机译：进行了一系列的全面实验风洞试验，以确定高密度，低转速，3叶片H型垂直轴风力涡轮机机翼上的空气动力学载荷行为。主要的振动响应是涡轮机主导旋转模式的共振激励。但是，对于大量的测试案例，在机翼支撑支柱的弯曲应变中也观察到了共振行为，主要对应于较高的固有频率。此外，在各种测试条件下，观察到支撑杆内的振动幅度在一次测试运行中会发生显着变化，这表明振动在机翼支撑杆组之间以复杂的跳动模式跳跃。为了隔离众多的振动激励和响应行为，在两种不同的支撑轴端部条件下，在从8 m / s到11 m / s的流速范围内进行了测试。
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