The propagation of spark-generated -waves through thermal turbulence into an acoustical shadow zone is experimentally studied at the laboratory scale into a shadow zone obtained using a curved surface. Thousands of waveforms are recorded in different regions, including the shadow zone. Statistics are described using a generalized gamma distribution. In the illuminated zone, an excellent agreement is obtained with previously published data. On average, in the illuminated zone, thermal turbulence attenuates the peak pressure by a factor of approximately 0.8, with random amplification or attenuation. Without turbulence, the pressure level rapidly vanishes in the shadow zone. Waveforms are well described using the linear analytical solution. With turbulence, a systematic amplification of the peak pressure by a factor of up to 8 is observed in the shadow zone, which is not the case in the illuminated zone. A doubling of the pressure level is a common event, with a probability of about 70%. With turbulence, the shadow zone is dominated by pressure waves previously scattered from the illuminated zone by turbulence. An increase in the surface area of maximum sound exposure is therefore observed.
Laboratory-Scale Experiment to Study -Wave Propagation into a Shadow Zone with Turbulence
AIAA Journal ; 1-9
01.06.2025
Aufsatz (Konferenz) , Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch
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