• CN:11-2187/TH
  • ISSN:0577-6686

›› 2011, Vol. 47 ›› Issue (12): 150-155.

• 论文 • 上一篇    下一篇

基于合成湍流来流的相控阵天线风载大涡模拟

杜强;杜平安   

  1. 电子科技大学机电工程学院
  • 发布日期:2011-06-20

Large Eddy Simulation of Wind Loads on Phased Array Antennas Based on Synthetic Turbulent Inflow

DU Qiang;DU Pingan   

  1. School of Mechatronics Engineering, University of Electronic Science and Technology of China
  • Published:2011-06-20

摘要: 风载是大气边界层中相控阵天线的主要载荷。针对Gaussian平稳随机过程理论无法计算横向脉动风载的局限性以及计算流体动力学(Computational fluid dynamics, CFD)中谱方法生成风速脉动的不合理,结合CFD和脉动风场模拟技术,提出一种大气边界层中天线风载的计算方法。根据大气条件下的Kaimal风速谱,采用谐波合成技术模拟出空间相关的顺风向及横向脉动风速,以此为计算边界条件,并采用动力Smagorinsky亚格子应力模式进行大涡模拟,计算出某相控阵天线的风压及风载系数时程。计算结果与具有相同体型的标准模型风洞试验结果及大涡模拟结果进行比较,表明采用合理布置风速模拟点的该方法在各方向上的计算结果均与试验结果比较吻合。该方法实现了对结构风压和风载时程的计算,具有广泛的通用性和重要的工程应用价值。

关键词: 大涡模拟, 风速合成, 风载, 相控阵天线

Abstract: Wind load is a main load on phased array antenna in atmospheric boundary layer. In view of the limitation that Gaussian stationary random process theory is unable to compute the transverse fluctuating wind load, and the unreasonableness that the fluctuating velocity is generated by spectral method in computational fluid dynamics (CFD), a method to compute the wind load on antenna in atmospheric boundary layer is presented by combining CFD and simulation technique of turbulent wind field. Based on the power spectral density function proposed by Kaimal, the longitudinal and transverse fluctuating wind velocity at some points are simulated by using the weighted amplitude wave superposition method, and added to the boundary conditions of computational model. Adopting dynamic Smagorinsky subgrid scale stress model in large eddy simulation, the time histories of wind pressure and wind load on a phased array antenna are computed, and compared with the data of a standard model with the same shape as the antenna which are obtained by numerical simulation and wind tunnel test. The results suggest that the computed results that the places of simulated points are reasonably arranged are in good agreement with the data from wind tunnel test in different directions. The method can be applied to the computation of time-history of wind pressure and wind load on structures in atmospheric boundary layer, thus having a widespread universality and important engineering application value.

Key words: Large eddy simulation, Phased array antennas, Synthesized wind velocity, Wind load

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