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Numerical and experimental investigation of a beveled trailing edge flow and noise field

机译:斜面后缘流场和噪声场的数值和实验研究

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Efficient tools and methodology for the prediction of trailing edge noise experience substantial interest within the wind turbine industry. In recent years, the Lattice Boltzmann method has received increased attention for providing an efficient alternative for the numerical solution of complex flow problems. Based on the fully explicit, transient, compressible Lattice Boltzmann solution in combination with the Ffowcs Williams and Hawking analogy, an estimation of the acoustic emission in the far field is obtained. To validate this methodology for the prediction of trailing edge noise, the flow around a plate with an asymmetric 25 degree beveled trailing edge in low Mach number flow is analyzed. Flow field dynamics are compared to experimental data obtained from Particle Image Velocimetry measurements and show similar trends and behavior for both the mean and fluctuating velocity. Results of the acoustic prediction are compared to acoustic measurements obtained through phased array beamforming in combination with a source power integration technique. Vortex shedding is captured, broadband noise is present on both the experimental and numerical obtained noise spectra and a typical cardioid-like directivity behavior is found.
机译:预测后缘噪声的有效工具和方法在风力涡轮机行业中引起了极大的兴趣。近年来,格子Boltzmann方法越来越受到关注,因为它为复杂流动问题的数值解提供了一种有效的替代方法。基于完全明确的,瞬态的,可压缩的Lattice Boltzmann解,与Ffowcs Williams和Hawking的类比相结合,获得了对远场声发射的估计。为了验证该方法对后缘噪声的预测,分析了低马赫数流中具有不对称25度斜面后缘的板周围的流动。将流场动力学与从“粒子图像测速”测量获得的实验数据进行比较,并显示出均值和脉动速度的相似趋势和行为。将声学预测的结果与通过相控阵波束成形结合源功率集成技术获得的声学测量结果进行比较。捕获了涡旋脱落,在实验和获得的数值噪声频谱上都存在宽带噪声,并且发现了典型的心形指向性行为。

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