Sound generation by a ring vortex-shock wave interaction

Szumowski, A. P.; Sobieraj, G.

doi:10.2514/3.13332

Cited by 7 publications

(4 citation statements)

References 5 publications

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“…Though direct information on the acoustic sound generated by the interaction was not provided, the mechanism of the shock wave-vortex ring interaction observed by Minota may be closely related to the sound generation. Similar experimental results for a shock wave-vortex ring interaction have also been reported by Szumowski & Sobieraj (1996).…”

Section: Introductionsupporting

confidence: 88%

Sound generation by shock–vortex interactions

1999

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Two-dimensional, unsteady, compressible flow fields produced by the interactions between a single vortex or a pair of vortices and a shock wave are simulated numerically. The Navier–Stokes equations are solved by a finite difference method. The sixth-order-accurate compact Padé scheme is used for spatial derivatives, together with the fourth-order-accurate Runge–Kutta scheme for time integration. The detailed mechanics of the flow fields at an early stage of the interactions and the basic nature of the near-field sound generated by the interactions are studied. The results for both a single vortex and a pair of vortices suggest that the generation and the nature of sounds are closely related to the generation of reflected shock waves. The flow field differs significantly when the pair of vortices moves in the same direction as the shock wave than when opposite to it.

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Section: Introductionsupporting

confidence: 88%

Sound generation by shock–vortex interactions

1999

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“…This is another origin of the asymmetry of the scattered waves. The scattered waves generated by the interaction between a vortex ring and a shock wave have been observed mainly by the optical method so far (Minota, 1993;Szumowski and Sobieraj 1995;Tokugawa et al, 1997). Owing to the three-dimensional structure of the interaction, it is di cult to measure the density ÿeld optically.…”

Section: Introductionmentioning

confidence: 99%

Scattered waves generated by shock wave and vortex ring interaction

2000

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Scattered waves generated by interaction of a vortex ring and a shock wave are studied experimentally and theoretically. Acoustic pressure is detected by microphones. A polar diagram of the acoustic pressure (with respect to time) constructed from the detected signals shows the waves clearly and the angular distribution of the acoustic pressure is captured visually. Mechanism of noise generation is also investigated. Theoretical formulation for sound scattering by vortex ÿeld is applied to describe shock-vortex interaction. Forms of the waves generated by the interaction are calculated by using the velocity ÿeld of a typical incident spherical shock wave and compared with the experimental data. Sound scattering by the density inhomogeneity inside a vortex core is also estimated. Some characteristic features of the scattered waves are described.

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“…This e!ect, which appears when the sound wave crosses the vortex core, is discussed in detail in Reference [7].…”

Section: Vortex}shock Wave Interactionmentioning

confidence: 99%