Experimental investigation of the flow characteristics within a shallow wall cavity for both laminar and turbulent upstream boundary layers

Grace, Sheryl M.; Dewar, William Gary; Wróblewski, D.

doi:10.1007/s00348-003-0761-3

Cited by 70 publications

(38 citation statements)

References 16 publications

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“…The effect of / H δ was also noted by Sinha et al [10]. A laminar incoming boundary layer generates strong vortex inside the cavity and the vortex is a more localized phenomenon near the rear face [11].…”

Section: Introductionsupporting

confidence: 53%

Self Sustained Oscillations for Square Cavities at Yaw

Chung¹

2017

AAOAJ

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An experimental study was conducted to determine the characteristics for a compressible turbulent flow over square cavities at yaw. Flush-mounted dynamic pressure transducers for mean and fluctuating pressure measurements were installed along the chordwise direction. The self-sustained oscillation phenomenon was examined by spectral density function. For a fixed yaw angle, the ratio of the incoming boundary layer thickness to the depth of the cavity has an evident influence near the rear corner of cavity, including the trailing-edge expansion and the maximum pressure fluctuations.

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Section: Introductionsupporting

confidence: 53%

Self Sustained Oscillations for Square Cavities at Yaw

Chung¹

2017

AAOAJ

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“…The ratio of the boundary layer thickness and the cavity depth was d/H = 1.125 and was deemed to be large to produce a regular vortex shedding due to shear layer instabilities (see Grace et al 2004). An important parameter which determines the occurrence of oscillations in a cavity is the ratio of the cavity length (respectively diameter) D over the boundary layer momentum thickness h. This ratio is here 14, which is low with respect to values found in literature for rectangular cavities, above which cavity flow oscillations are expected (see Grace et al 2004). These experimental conditions were chosen to be as similar as possible to the ones of Dybenko et al (2006) to maximize the possibility to reproduce the reported asymmetric flow pattern.…”

Section: Methodsmentioning

confidence: 99%

Investigation of the flow in a circular cavity using stereo and tomographic particle image velocimetry

2008

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The turbulent flow over a circular cavity with an aspect ratio of D/H = 2 is investigated by multi-planar stereoscopic particle image velocimetry and with tomographic particle image velocimetry (PIV). The main aim of the study is the flow topology and the turbulent structure of the asymmetrical flow pattern that forms inside the cavity at these specific conditions. The flow field is measured in the vertical symmetry plane to describe the overall recirculation pattern in the cavity and the turbulent shear layer developing from the separation point. In this specific regime the shear layer fluctuations are recognized as those caused by instabilities together with the effect of the incoming boundary layer turbulence. Additional observations performed at several wall-parallel planes at different height inside the cavity allow to further evaluate the secondary flow circulation generated by this asymmetric regime. The observed flow pattern consists of a steady vortex, occupying the entire cavity volume and placed diagonally inside the cavity such to entrain the external flow from one side, capture it into a circulatory motion and eject it from the opposite side of the cavity. The spatial distribution of the turbulent fluctuations also reveals the same structure. The tomographic PIV measurement returns a visual inspection to the instantaneous three-dimensional structure of the turbulent fluctuations, which at the investigated height exhibit a low level of coherence with slightly elongated vortices in the recirculating flow inside the cavity.

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“…Also few experiments have managed to obtain satisfactory simultaneous measurements of both spatial and temporal variations in a cavity. They have usually been confined to single-point time-resolved measurements or full-field PIV imaging at low speeds, (Ahuja and Mendoza 1995;Block 1976;Grace et al 2004;Tam and Block 1978). Some more recent attempts, such as that of Haigermoser et al (2008) and Haigermoser (2009), have performed time-resolved PIV measurements, in water flows and at low free-stream velocity.…”

Section: Introductionmentioning

confidence: 99%

High speed PIV applied to aerodynamic noise investigation

et al. 2010

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In this paper, we study the acoustic emissions of the flow over a rectangular cavity. Especially, we investigate the possibility of estimating the acoustic emission by analysis of PIV data. Such a possibility is appealing, since it would allow to directly relate the flow behavior to the aerodynamic noise production. This will help considerably in understanding the noise production mechanisms and to investigate the possible ways of reducing it. In this study, we consider an open cavity with an aspect ratio between its length and depth of 2 at a Reynolds number of 2.4 9 10 4 and 3.0 9 10 4 based on the cavity length. The study is carried out combining high speed two-dimensional PIV, wall pressure measurements and sound measurements. The pressure field is computed from the PIV data. Curle's analogy is applied to obtain the acoustic pressure field. The pressure measurements on the wall of the cavity and the sound measurements are then used to validate the results obtained from PIV and check the range of validity of this approach. This study demonstrated that the technique is able to quantify the acoustic emissions from the cavity and is promising especially for capturing the tonal components on the sound emission.

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Experimental investigation of the flow characteristics within a shallow wall cavity for both laminar and turbulent upstream boundary layers

Cited by 70 publications

References 16 publications

Self Sustained Oscillations for Square Cavities at Yaw

Self Sustained Oscillations for Square Cavities at Yaw

Investigation of the flow in a circular cavity using stereo and tomographic particle image velocimetry

High speed PIV applied to aerodynamic noise investigation

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