均匀各向同性大气湍流对声爆传播特性的影响

doi:10.7527/S1000-6893.2019.23290

Abstract

Abstract: Based on the finite sum of discrete Fourier modes and the modified waveform parameter method, the effect of homogeneous isotropic atmospheric turbulence on sonic boom propagation is studied. The model used during CFD simulation is a self-generated simplified supersonic business aircraft. First, the flow field is obtained by solving the three dimensional Navier-Stokes equations using ARI_Overset in-house CFD solver developed by AVIC Aerodynamics Research Institute, and the near-field pressure is then extracted from the CFD results. Second, based on the Von Karman energy spectrum, a random velocity field of homogeneous isotropic atmospheric turbulence is calculated from the finite sum of discrete Fourier modes. Finally, the sonic boom signature on the ground is calculated by the modified waveform parameter method. The results indicated that the atmospheric turbulence has a marked influence on sonic boom overpressure during its propagation to the ground. The sonic boom increased in 55% of the cases and decreased in 45% of the cases. Compared to the no-turbulence condition, the turbulence seems to favor an increase rather than a decrease in boom overpressure. Although the turbulence has a small effect on the propagation path from the flight altitude to the ground, it may result in a variability of the point where the sonic boom reaches on the ground.

Key words: supersonic aircraft, sonic boom, far-field propagation, atmospheric turbulence effect, homogeneous isotropic turbulence

CLC Number:

V211.3

LENG Yan, QIAN Zhansen, YANG Long. Homogeneous isotropic atmospheric turbulence effects on sonic boom propagation[J]. ACTA AERONAUTICAET ASTRONAUTICA SINICA, 2020, 41(2): 123290-123290.

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Homogeneous isotropic atmospheric turbulence effects on sonic boom propagation

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