Sensitivity of sonic boom propagation throughout a turbulent atmosphere

Leconte, Roman; Marchiano, Régis; Chassaing, Jean-Camille; Coulouvrat, François

doi:10.1121/1.5136635

Cited by 2 publications

(1 citation statement)

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“…Turbulence is represented as both temperature and wind fluctuations, usually taken from measurements or inferred. In [72], the great influence of atmospheric turbulence parameters on both classic N-waves (on which turbulence has greater influence) and low boom pressure signatures at the ground is shown, highlighting the need of stochastic studies. Another important phenomenon that needs to be carefully predicted and simulated is focused booms.…”

Section: Advances In Pressure Propagationmentioning

confidence: 99%

Review of Sonic Boom Prediction and Reduction Methods for Next Generation of Supersonic Aircraft

Bonavolontà,

Lawson,

Riaz

2023

Aerospace

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The reduction of sonic boom levels is the main challenge but also the key factor to start a new era of supersonic commercial flights. Since 1970, a FAA regulation has banned supersonic flights overland for unacceptable sonic booms at the ground, and many research studies have been carried out from that date to understand sonic boom generation, propagation and effects, both on the environment and communities. Minimization techniques have also been developed with the attempt to reduce sonic boom annoyance to acceptable levels. In the last 20 years, the advances in both knowledge and technologies, and companies and institutions’ significant investments have again raised the interest in the development of new methods and tools for the design of low boom supersonic aircraft. The exploration of unconventional configurations and exotic solutions and systems seems to be needed to effectively reduce sonic boom and allow supersonic flight everywhere. This review provides a description of all aspects of the sonic boom phenomenon related to the design of the next generation of supersonic aircraft. In particular, a critical review of the prediction and minimization methods found in the literature, aimed at identifying their strengths, limitations and gaps, is made, along with a complete overview of disruptive unconventional aircraft configurations and exotic active/passive solutions to boom level reduction. The aim of the work is to give a clear statement of state-of-the-art sonic boom prediction methods and possible reduction solutions to be explored for the design of next low-boom supersonic aircraft.

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Section: Advances In Pressure Propagationmentioning

confidence: 99%

Review of Sonic Boom Prediction and Reduction Methods for Next Generation of Supersonic Aircraft

Bonavolontà,

Lawson,

Riaz

2023

Aerospace

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Numerical prediction of loudness metrics for N-waves and shaped sonic booms in kinematic turbulence

Carr

Lonzaga

Miller

2022

The Journal of the Acoustical Society of America

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The effects of a kinematic field of velocity fluctuations on the loudness metrics of two waveforms are examined with a three-dimensional one-way propagation solver. The waveforms consist of an N-wave and a simulated low-boom from NASA's X-59 QueSST aircraft. The kinematic turbulence is generated using a von Kármán composite spectrum, which is dependent on a root mean square (rms) velocity and outer scale of the turbulence. A length scale is proposed to account for the effect of the rms velocity and integral scale on the focusing and defocusing of the sonic boom waveform. The probability density function of the location of the first caustic attains a maximum value when the propagation distance is equal to the proposed length scale. Simulation results indicate that for small values of the nondimensional propagation distance, the standard deviation of the loudness metrics increases linearly. The loudness metrics follow a normal distribution within a given range of the nondimensional propagation distance. Results indicate the potential to parameterize the loudness metric distributions by the rms velocity and integral length scale.

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Sensitivity of sonic boom propagation throughout a turbulent atmosphere

Cited by 2 publications

References 0 publications

Review of Sonic Boom Prediction and Reduction Methods for Next Generation of Supersonic Aircraft

Review of Sonic Boom Prediction and Reduction Methods for Next Generation of Supersonic Aircraft

Numerical prediction of loudness metrics for N-waves and shaped sonic booms in kinematic turbulence

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