Flow regimes associated with yawed rectangular cavities

Czech, Michael; Savory, Eric; Toy, N.; Mavrides, T.

doi:10.1017/s0001924000092046

Cited by 8 publications

(3 citation statements)

References 20 publications

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“…The two microphones used for analysis were located at the centre of the cavity base and on the working section surface 126 mm upstream of the cavity centre to be used as a reference signal for tunnel noise. Previous studies by Johnston et al [13] and Czech et al [14] have shown that this type of microphone can be successfully used to analyse the frequency spectrum of the fluctuating pressure field when mounted flush with the surface.…”

Section: Microphone Measurementsmentioning

confidence: 99%

An experimental investigation of turbulent boundary layer flow over surface-mounted circular cavities

Dybenko

Savory

2008

Proceedings of the Institution of Mechanical Engineers, Part G:

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Turbulent boundary layer flow over cavities of circular planform has been measured experimentally by examining pressures at the cavity surfaces and velocity and turbulence in the cavity wake for cavity depths ( h) of 0.20, 0.47, and 0.70 D (cavity diameter). Tests were conducted at a constant Mach number of 0.08 resulting in Re X = 7.3 × 106 and ReD = 1.3 × 105. Velocity measurements acquired in the cavity wake, using hot-wire anemometry, suggest the existence of an asymmetric trailing vortex for h/D ≍ 0.5. The increased amplitude of broadband low-frequency pressure oscillations observed at h/ D ≍ 0.5 may be a result of the high level of flow asymmetry and cavity drag observed for this depth and not for other depths tested. Also, a faint peak is seen in the power spectrum for this depth at a Strouhal number related in previous work to cavity feedback resonance. Contours of fluctuation pressures at the cavity surfaces are also presented. Details of a flow-switching control mechanism for the asymmetric trailing vortex noted for h/D ≍ 0.5 are also presented herein. Good agreement was noted between the present results and those from previous investigations.

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Section: Microphone Measurementsmentioning

confidence: 99%

An experimental investigation of turbulent boundary layer flow over surface-mounted circular cavities

Dybenko

Savory

2008

Proceedings of the Institution of Mechanical Engineers, Part G:

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“…As discussed in detail in Chapters 3 and 4, experimental measurements of the flow field [50], [71], [72], and [73].…”

Section: Discussionmentioning

confidence: 99%

Experimental and Numerical Study of Flow Structures Associated With Low Aspect Ratio Elliptical Cavities

Khadivi¹,

Savory

2013

Journal of Fluids Engineering

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The flow regimes associated with a 2:1 aspect ratio, elliptical planform cavity in a turbulent flat plate boundary layer have been systematically examined for various depth/width ratios (0.1 to 1.0) and yaw angles (0° to 90°), using a combination of wind tunnel experiments (involving Particle Image Velocimetry and helium bubble visualization) and Computational Fluid Dynamics (CFD) simulations (employing threedimensional steady calculations with the Reynolds Stress model turbulence closure).Satisfactory agreement has been found between the results using the two methods, indicating that the steady numerical simulations can be a cost-effective tool to predict the mean flow features.The flow has been found to be highly dependent on yaw angle and cavity depth. For each of the three broad flow categories specified according to yaw angle, which include the symmetric flow regime (yaw angle = 0°), the straight vortex regime (yaw angle = 90°) and the asymmetric flow regime (15° ≤ yaw angle ≤ 60°) different regimes are found to exist, depending on cavity depth. For each combination of yaw angle and depth, the flow has been analyzed through investigation of shear layer parameters, the three-dimensional vortex structure, pressure distribution and drag, wake flow, and vortex oscillations.While the elliptical cavity flows have been found to have some similarities with those of nominally two-dimensional and rectangular cavities, the three-dimensional effects due to the low aspect ratio and curvature of the walls give rise to features exclusive to low aspect ratio elliptical cavities, including formation of cellular structures at intermediate depths and unique vortex structures within and downstream of the cavity.The three-dimensional flow structure of the flow is most pronounced in the asymmetric regimes with large yaw angles (45° and 60°). The dominant feature in this regime is the formation of a trailing vortex that is associated with high drag and flow oscillations within the cavity.iv Keywords

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“…A yawed rectangular cavity means the flow are parallel to the planform of a cavity, but the chordwise direction of the cavity has an angle, β , with respect to the freestream direction [7]. An asymmetric flow pattern inside the cavity was observed [8]. Lada & Kontis [9] showed the yaw angle either disturbs the shear layer or changes the flow type, resulting in attenuation of self-sustained oscillations.…”

Section: Introductionmentioning

confidence: 99%

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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Flow regimes associated with yawed rectangular cavities

Cited by 8 publications

References 20 publications

An experimental investigation of turbulent boundary layer flow over surface-mounted circular cavities

An experimental investigation of turbulent boundary layer flow over surface-mounted circular cavities

Experimental and Numerical Study of Flow Structures Associated With Low Aspect Ratio Elliptical Cavities

Self Sustained Oscillations for Square Cavities at Yaw

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