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Description of coherent structures in the atmospheric boundary layer by model reduction of the surface pressure

机译：通过表面压力模型降低描述大气边界层中的相干结构

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摘要

The flow of coherent turbulent structures into a wind turbine is associated with vibrational blade excitation. Successful forecasting of such turbulent events for control system input would increase the lifetime of turbine components. The coherence of these features suggests description by model reduction. To this end, an array of pressure transducers was deployed on the ground at Reese Technology Center in Lubbock, Texas, and the pressure fluctuations were recorded over nearly two diurnal cycles. A program for computation of the dynamic mode decomposition was developed with special consideration for the case of a non-stationary, nonlinear system. A simulated surface-pressure perturbation was first decomposed, to inform the interpretation of experimental data. Several sets of surface-pressure data were decomposed for various meteorological conditions. The resulting dynamic modes and eigenvalues describe the spatial and temporal coherence of local features in the atmospheric boundary layer. In each case, modes were identified that can be associated with wave-like pressure fluctuations that propagate either at convective or acoustic speeds.
机译：相干湍流结构进入风力涡轮机的过程与振动叶片的激振有关。对于控制系统输入，成功预测此类湍流事件将增加涡轮机组件的使用寿命。这些特征的一致性建议通过模型简化来描述。为此，在德克萨斯州拉伯克市里斯技术中心的地面上部署了一系列压力传感器，并记录了近两个昼夜周期的压力波动。开发了用于动态模式分解的计算程序，其中特别考虑了非平稳非线性系统的情况。首先将模拟的表面压力扰动分解，以提供对实验数据的解释。针对各种气象条件，分解了几组表面压力数据。所产生的动态模式和特征值描述了大气边界层中局部特征的空间和时间连贯性。在每种情况下，都可以识别出与以对流或声速传播的波浪状压力波动相关的模式。

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  • 作者

    Lyons, Gregory William.;

  • 作者单位

    The University of Mississippi.;

  • 授予单位 The University of Mississippi.;
  • 学科 Atmospheric sciences.
  • 学位 M.S.
  • 年度 2012
  • 页码 58 p.
  • 总页数 58
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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