马创, 黄江涛, 刘刚, 等. 超声速飞行器近场声爆信号反演技术[J]. 空气动力学学报, 2023, 41(4): 1−10. doi: 10.7638/kqdlxxb-2021.0411
引用本文: 马创, 黄江涛, 刘刚, 等. 超声速飞行器近场声爆信号反演技术[J]. 空气动力学学报, 2023, 41(4): 1−10. doi: 10.7638/kqdlxxb-2021.0411
MA C, HUANG J T, LIU G, et al. Inversion technology of near-field sonic boom signal of supersonic aircraft[J]. Acta Aerodynamica Sinica, 2023, 41(4): 1−10. doi: 10.7638/kqdlxxb-2021.0411
Citation: MA C, HUANG J T, LIU G, et al. Inversion technology of near-field sonic boom signal of supersonic aircraft[J]. Acta Aerodynamica Sinica, 2023, 41(4): 1−10. doi: 10.7638/kqdlxxb-2021.0411

超声速飞行器近场声爆信号反演技术

Inversion technology of near-field sonic boom signal of supersonic aircraft

  • 摘要: 超声速民机是新一代民机的重要发展方向,其独有的声爆现象是制约其在陆地上空进行超声速飞行的最关键因素。对超声速飞行器的气动外形进行反设计是声爆抑制的有效途径。基于等效面积分布开展反设计,需要远场感知声压级作为直接指导。为此,提出了逆向传播分别与本征正交分解(proper orthogonal decomposition, POD)及伴随方程结合,根据远场声爆信号反演近场声爆信号的方法。采用第二届声爆会议(SBPW)提供的LM1021标模算例,并从远场频域内声压级、响度级和感觉噪声级进行反演可信度评估。结果表明,对于给定的任意远场声爆信号,基于逆向传播结果进行POD反演及伴随方程反演,都可以得到较为准确的近场过压信号,且伴随方程反演方法具有更优的高频信号即局部激波信号反演能力,远场感知声压级更精准。反演结果相应的等效面积分布与参考值高度吻合,表明此方法能够为等效面积指导的低声爆气动优化设计提供基础。

     

    Abstract: Supersonic civil aircraft is an important development direction of the aviation industry; its unique sonic boom phenomenon is the most significant factor restricting its supersonic flight over land. The inverse design of the aerodynamic shape of supersonic aircraft is an effective way to suppress the sonic boom. In order to get more accurate design results, the inverse design based on equivalent area distribution needs the direct guidance of far-field perceived sound pressure level. For this reason, methods combining reverse propagation with POD and adjoint equation gradient optimization are proposed to inverse the near-field sonic boom signals from the far-field ones. We use the standard model LM1021 provided by SBPW for calculation. The accuracy is evaluated from far-field sonic boom signals’ sound pressure and loudness levels in the frequency domain. The results show that POD optimization and adjoint equation gradient optimization based on the reverse propagation results can obtain a more accurate near-field overpressure signal for an arbitrary far-field sonic boom signal. Of these two methods, the adjoint equation inversion method has a better inversion ability for high-frequency shock signals, yielding more accurate far-field sound pressure levels. Furthermore, the equivalent area distribution is highly consistent with the reference value. This method can provide a solid basis for the aerodynamic optimization design of low sonic explosion guided by equivalent area.

     

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