平面声波扰动大气湍流非柯尔莫哥洛夫谱折射率功率谱分布

Non-Kolmogorov Refractive Index Power Spectral Distribution of Atmospheric Turbulence Perturbed by Plane Acoustic Waves

  • 摘要: 本文基于声波能量和湍流能量平衡方程, 推导在平面声波扰动下各向同性和各向异性Non-Kolmogoro(非柯尔莫哥洛夫谱)折射率功率谱函数的表达式, 数值仿真在不同声源功率和频率下, 平面声源激发产生的声场能量分布。计算声源参数一定时, 不同功率谱幂律和各向异性因子下的Non-Kolmogorov折射率功率谱函数的分布情况。结果表明: 在声波传输距离一定时, 各向同性Non-Kolmogorov折射率功率谱随功率谱幂律的增大呈整体下降趋势; 各向异性Non-Kolmogorov折射率功率谱随各向异性因子的增大呈整体上升状态; 在空间波数一定时, Non-Kolmogorov折射率功率谱随声波传输距离的增大呈现极大值和极小值交替变化。

     

    Abstract: As mechanical waves with energy, acoustic waves interact with the atmosphere during propagation and disturb the spatial and temporal distribution characteristics of atmospheric turbulence. Based on the equations of acoustic energy and turbulent energy equilibrium, the expression of the power spectrum function of the isotropic and anisotropic Non-Kolmogorov refractive index under the plane acoustic wave disturbance is derived, and the energy distribution of the sound field generated by the excitation of the plane sound source under different sound source powers and frequencies is numerically simulated, and the distribution of the non-Kolmogorov refractive index power spectrum function under different power spectral power laws and anisotropy factors is further calculated when the acoustic source parameters are fixed. The results show that when the acoustic wave transmission distance is fixed, the isotropic non-Kolmogorov refractive index power spectrum shows an overall decreasing trend with the increase of the power spectrum power law. The anisotropic Non-Kolmogorov refractive index power spectrum increased as a whole with the increase of the anisotropic factor. When the spatial wavenumber is constant, the power spectrum of the Non-Kolmogorov refractive index alternately changes with the increase of the acoustic wave transmission distance.

     

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