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Blade loads on tidal turbines in planar oscillatory flow

机译：平面振荡流中潮汐涡轮机的叶片载荷

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摘要

Characterisation of the unsteady hydrodynamic loads is essential for accurate predictions of the fatigue life and ultimate loads of tidal turbine blades. This paper analyses a set of experimental tests of the hydrodynamic blade root out-of-plane bending moment response to planar oscillatory motion, chosen as an idealised representation of the unsteadiness imparted by waves and turbulence. Phenomena associated with dynamic stall are observed which are sensitive to the oscillatory frequency and velocity amplitude. Flow separation is shown to result in loads significantly greater in magnitude than that for steady flow. Following flow reattachment, the load cycles compare relatively well with Theodorsen's theory for a two-dimensional foil oscillating in heave, suggesting that circulation due to the shed wake dominates the unsteadiness in phase with acceleration, over added mass effects. For attached flow, the effect of unsteadiness is comparatively much smaller. At low frequencies a phase lead over the velocity is observed, compared to a lag at higher frequencies. Multiple frequency oscillations are also briefly considered. Reconstruction of the multi-frequency response using both the steady flow measurements, and the single frequency measured response, is shown to offer a relatively good fit when the flow is attached, for lower frequency combinations.
机译：非稳态流体动力载荷的表征对于准确预测潮汐涡轮机叶片的疲劳寿命和极限载荷至关重要。本文分析了一组流体动力学叶片根部平面外弯矩对平面振荡运动的响应的实验测试，被选作波浪和湍流所赋予的不稳定性的理想表示。观察到与动态失速相关的现象，该现象对振荡频率和速度振幅敏感。流动分离被显示出导致载荷的大小明显大于稳定流动的载荷。重新流动之后，载荷周期与Theodorsen的关于二维箔片在波浪中振荡的理论相对比较好，这表明，由于脱落的尾流而引起的循环在增加质量效应的基础上与加速度的相位不稳定。对于附加流，不稳定的影响相对要小得多。在低频下，观察到速度上的相位超前，而在高频下则出现滞后。还简要考虑了多频振荡。使用固定流量测量值和单频测量响应值来重建多频响响应，显示出在连接流量时相对较低的频率组合具有相对较好的拟合度。

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  • 来源
    《Ocean Engineering》 |2013年第1期|163-174|共12页
  • 作者

    I.A. Milne; A.H. Day; R.N. Sharma; R.G.J. Flay;

  • 作者单位

    Department of Mechanical Engineering, The University of Auckland, Private Bag 92019, Auckland Mail Centre, Auckland 1142, New Zealand;

    Department of Naval Architecture and Marine Engineering, University of Strathclyde, Henry Dyer Building, 100 Montrose Street, Glasgow G4 012, UK;

    Department of Mechanical Engineering, The University of Auckland, Private Bag 92019, Auckland Mail Centre, Auckland 1142, New Zealand;

    Department of Mechanical Engineering, The University of Auckland, Private Bag 92019, Auckland Mail Centre, Auckland 1142, New Zealand;

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  • 原文格式 PDF
  • 正文语种 eng
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  • 关键词

    tidal turbine; unsteady hydrodynamics; dynamic stall; added mass; rotor aerodynamics;

    机译：潮汐涡轮机不稳定的流体动力学动态失速增加质量转子空气动力学;

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