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Wind tunnel experiments on the flow over rectangular cavities at subsonic and transonic speeds
TLDR
In this article, measurements have been made of the time average and unsteady pressures acting on the roof and behind a series of rectangular cavities set in the roof of the 2 ft x 1 tr ft transonic tunnel.Abstract:
Measurements have been made of the time average and unsteady pressures acting on the roof and behind a series of rectangular cavities set in the roof of the 2 ft x 1tr ft transonic tunnel.
It was found that the unsteady pressures contain both random and periodic components. The random component predominates in the shallower cavities (length/depth ratio> 4) and is most intense near the rear wall. The periodioc component predominates in the deeper cavities (length/depth ratio < 4) and may form standing wave patterns. It is suggested that the periodic component is due to an acoustic resonance within the cavity excited by a phenomenon similar to th at causing edge-tones. It may be suppressed by fixing a small spoiler at the front of the cavity.read more
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Computational aeroacoustics: progress on nonlinear problems of sound generation
Tim Colonius,Sanjiva K. Lele +1 more
TL;DR: A hierarchy of computational approaches that range from semi-empirical schemes that estimate the noise sources using mean-flow and turbulence statistics, to high-fidelity unsteady flow simulations that resolve the sound generation process by direct application of the fundamental conservation principles is discussed in this paper.
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On self-sustained oscillations in two-dimensional compressible flow over rectangular cavities
TL;DR: In this article, the authors used numerical simulations to investigate the resonant instabilities in two-dimensional flow past an open cavity and showed a transition from a shear-layer mode to a wake mode for longer cavities and higher Mach numbers.
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On the tones and pressure oscillations induced by flow over rectangular cavities
TL;DR: In this paper, a mathematical model of the cavity tones and pressure oscillation phenomenon based on the coupling between shear layer instabilities and acoustic feedback is developed to help in understanding the tone generation mechanism.
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Flow-Induced Pressure Oscillations in Shallow Cavities
TL;DR: In this paper, the results of an experimental wind-tunnel study of flow-induced pressure oscillations in shallow cavities (length-to-depth ratio from 4 to 7) were presented.
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Dynamics and control of high-reynolds-number flow over open cavities
TL;DR: The effects of high-frequency open-loop forcing, fundamental limitations of feedback control for a given configuration of sensors and actuators, and the development of a feedback design methodology that respects the limited range of validity of the available dynamical models are discussed.