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Velocity and surface pressure measurements in an open cavity
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TLDR
In this article, particle image velocimetry (PIV), surface pressure measurements, and hot-wire measurements were combined with quadratic stochastic estimation to predict the time-dependent behavior of the velocity field.Abstract:
Subsonic flow of approximately Mach 0.2 over cavities with L/D ratios of 5.16 and 1.49 were studied experimentally using particle image velocimetry (PIV), surface pressure measurements, and hot-wire measurements. The incoming boundary layer was turbulent in both cases. The PIV data was analyzed to yield mean flow characteristics, vorticity field information, and two-point statistics for the velocity field. The hot-wire data was combined with surface pressure measurements to detail the correlations between velocity and pressure fluctuations. An analysis of the correlation between surface pressure measurements shows contrasting characteristics for the two cavity aspect ratios. The PIV data was combined with surface pressure measurements through the application of quadratic stochastic estimation to predict the time-dependent behavior of the velocity field. An examination of the results supports the existence of different cavity flow modes, as has been suggested in much of the literature.read more
Citations
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Supersonic Cavity Flows and Their Control
TL;DR: A detailed experimental study of supersonic, Mach 2, flow over a three-dimensional cavity was conducted using shadowgraph visualization, unsteady surface pressure measurements, and particle image velocimetry as discussed by the authors.
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Feedback control of subsonic cavity flows using reduced-order models
TL;DR: In this article, a reduced-order model-based feedback control of subsonic shallow cavity flows is presented and the results of reducedorder model based feedback control are presented and discussed.
Journal ArticleDOI
Suppression of Pressure Loads in Cavity Flows
TL;DR: In this article, a leading edge fence along with a cylindrical rod, suspended in the approaching boundary layer parallel to the leading edge of the cavity, was examined and the overall pressure levels along with the spectral distribution of the surface pressure in the cavity were shown to he altered in a favorable manner by both of these devices.
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Stochastic estimation of a separated-flow field using wall-pressure-array measurements
TL;DR: In this paper, the authors investigated the evolution of coherent structures in the flow field by employing proper orthogonal decomposition (POD) and multipoint, linear, stochastic estimation (mLSE) analysis techniques.
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Multi-time-delay LSE-POD complementary approach applied to unsteady high-Reynolds-number near wake flow
TL;DR: In this paper, the authors compared the performance of single and multi-time-delay linear stochastic estimation-proper orthogonal decomposition (LSE-POD) methods in the temporal domain.
References
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Wind tunnel experiments on the flow over rectangular cavities at subsonic and transonic speeds
TL;DR: 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.
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Review—Self-Sustaining Oscillations of Flow Past Cavities
Donald Rockwell,E. Naudascher +1 more
Wind-Tunnel Experiments on the Flow over Rectangular Cavities at Subsonic and Transonic Speeds
TL;DR: In this paper, 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.
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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.