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首页> 外文期刊>Applied Acoustics >Damping of flexural vibrations in turbofan blades using the acoustic black hole effect
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Damping of flexural vibrations in turbofan blades using the acoustic black hole effect

机译：利用声学黑洞效应抑制涡轮风扇叶片的弯曲振动

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摘要

The results of the experimental study into the damping of flexural vibrations in turbofan blades with trailing edges tapered according to a power-law profile are reported. Trailing edges of power-law profile (wedges), with small pieces of attached absorbing layers, materialise one-dimensional acoustic black holes for flexural waves that can absorb a large proportion of the incident flexural wave energy. The experiments were carried out on four model blades made of aluminium. Two of them were twisted, so that a more realistic fan blade could be considered. All model blades, the ones with tapered trailing edges and the ones of traditional form, were excited by an electromagnetic shaker, and the corresponding frequency response functions have been measured. The results show that the resonant peaks are reduced substantially once a power-law tapering is introduced to the blade. An initial study into the aerodynamic implications of this method has been carried out as well, using measurements in a closed circuit wind tunnel. In particular, the effects of the trailing edge of power-law profile on the airflow-excited vibrations of the fan blades have been investigated. It has been demonstrated that trailing edges of power-law profile with appropriate damping layers are efficient in reduction of the airflow-excited vibrations of the fan blades. The obtained results demonstrate that power-law tapering of trailing edges of turbofan blades can be a viable method of reduction of blade vibrations.
机译：报道了对后缘根据幂律曲线渐缩的涡轮风扇叶片的弯曲振动进行阻尼的实验研究结果。幂律轮廓的后缘（楔形物）带有一小片附着的吸收层，形成了挠曲波的一维声学黑洞，可以吸收大部分入射挠曲波能量。实验是在四个铝制模型叶片上进行的。它们中的两个被扭曲了，因此可以考虑使用更逼真的风扇叶片。所有型号的叶片（具有锥形后缘的叶片和传统形式的叶片）均由电磁振动器激发，并测量了相应的频率响应函数。结果表明，一旦将幂律渐缩引入到叶片，共振峰就会大大降低。还使用闭路风洞中的测量值对该方法的空气动力学含义进行了初步研究。特别地，已经研究了幂律轮廓的后缘对风扇叶片的气流激发的振动的影响。已经证明，具有适当的阻尼层的幂律轮廓的后沿在减小风扇叶片的气流激发的振动方面是有效的。获得的结果表明，涡轮风扇叶片后缘的幂律逐渐减小可能是减少叶片振动的可行方法。

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  • 来源
    《Applied Acoustics》 |2014年第2期|359-365|共7页
  • 作者

    E.P. Bowyer; V.V. Krylov;

  • 作者单位

    Department of Aeronautical and Automotive Engineering, Loughborough University, Loughborough, Leicestershire LE11 3TU, UK;

    Department of Aeronautical and Automotive Engineering, Loughborough University, Loughborough, Leicestershire LE11 3TU, UK;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Vibration damping; Turbofan blades; Acoustic black hole effect; Wedges of power-law profile;

    机译：减振;涡轮风扇叶片;声学黑洞效应;幂律轮廓的楔形;

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