| 王明军,杜桂中,张佳琳,吴小虎.声波扰动近地面边界层湍流脉动特性*[J].,2024,43(6):1181-1192 |
| 声波扰动近地面边界层湍流脉动特性* |
| The turbulent pulsation characteristics in the near-surface boundary layer disturbed by acoustic waves |
| 投稿时间：2023-07-11 修订日期：2024-10-29 |
| 中文摘要: |
| 声波是具有能量的机械波，在大气湍流传输时会改变其物理特征参数，从而影响湍流的时空结构演化。该文基于声波特性和大气湍流理论，结合湍流脉动流速与大气物理特征参数之间的关系式，通过理论建模和数值模拟，分析了声波扰动下近地面边界层湍流脉动特性及流速变化，进一步探索声压级的空间分布与大气湍流基本特征参数之间的关系，并对近地面区域内的声压级分布及流速变化进行了实验验证。结果表明：在边界层距离声源较近的区域，声场强度越大，对湍流的扰动作用越强，湍流脉动流速变化越快，表明声源会破坏边界层内大气湍流的初始流动状态，影响湍流的时空结构演化，然而改变声源频率，对湍流脉动速度的影响并不是特别的明显。该文主要研究地空链路声波特性与大气湍流结构时空演化物理特性之间的变化规律，数值计算结果可为地空链路光电对抗中大气湍流环境光传输信道特性的改善和干扰提供理论依据。 |
| 英文摘要: |
| Acoustic waves are mechanical waves with energy, which change their physical characteristic parameters when transmitted in atmospheric turbulence, thus affecting the spatial and temporal structure evolution of turbulence. In this paper, based on the characteristics of acoustic waves and atmospheric turbulence theory, the relationship between turbulent pulsation velocity and atmospheric physical characteristic parameters is combined with theoretical modeling and numerical simulation to analyze the turbulent pulsation characteristics and flow velocity changes in the near-surface boundary layer under acoustic disturbance, further explores the relationship between the spatial distribution of the sound pressure level and the basic atmospheric turbulence parameters, and experimentally validates the distribution and flow velocity changes of the turbulent sound pressure level in the near-surface area after the acoustic wave perturbation. The results show that in the region where the boundary layer is closer to the acoustic source, the greater the intensity of the acoustic field, the stronger the perturbation effect on the turbulent flow and the faster the change of turbulent pulsation flow velocity, indicating that the acoustic source will destroy the initial flow state of the turbulent flow in the boundary layer and affect the spatial and temporal structure evolution of the turbulent flow, however, changing the frequency of the acoustic source does not have a particularly obvious effect on the turbulent pulsation velocity. This paper focuses on the variation law between the acoustic properties of ground-space links and the physical properties of the spatio-temporal evolution of atmospheric turbulence structure, and the numerical calculation results can provide a theoretical basis for the improvement of the optical transmission channel characteristics of atmospheric turbulence environment and interference in the ground-space link photoelectric countermeasures. |
| DOI：10.11684/j.issn.1000-310X.2024.06.001 |
| 中文关键词: 声波特性 近地面层湍流 湍流脉动特性 大气特征参数 |
| 英文关键词: Acoustic properties Near-surface layer turbulence Turbulent pulsation characteristics Atmospheric characteristic parameters |
| 基金项目:国家自然科学基金重大研究计划培育项目(92052106), 国家自然科学基金项目(61771385), 陕西省重点领域创新团队(2024RS-CXTD-12), 陕西省高校创新团队、西安市重点产业链关键核心技术攻关项目(103-433023062), 咸阳市重点研发计划(L2023-ZDYF-QYCX-025), 河南省可见光通信重点实验室基金项目(HKLVLC2023-B05) |
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