Experimental measurement of flow past cavities of different shapes

Özalp, Coşkun; Pınarbaşı, Ahmet; Şahi̇n, Beşi̇r

doi:10.1016/j.expthermflusci.2009.11.003

Cited by 74 publications

(36 citation statements)

References 18 publications

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“…The linear growth of the shear layer thickness in the case of turbulent boundary layer was also confirmed by other studies [23]- [26]. [29]. This behaviour was attributed to the increased energizing effect of the shear layer [27].…”

Section: Cavity Flowssupporting

confidence: 75%

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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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Section: Cavity Flowssupporting

confidence: 75%

“…The circulation of the vortices was found to be larger for vortices with larger cores [27]. Also, velocity fluctuations and Reynolds stress components were found to increase with increasing Reynolds number, and towards the downstream wall [28] and [29].…”

Section: Cavity Flowsmentioning

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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“…Huang et al [9] investigated the effect of the cavity configuration on the combustion flow field performance of the hypersonic vehicle, and they found that the cavity with the sweptback angle 45° could further improve the aero-propulsive performance of the hypersonic vehicle. The characteristics of the cavities with different shapes in the free stream with low velocity were experimentally tested by Ozalp et al [13], and three different Reynolds numbers (1230, 1460, and 1700) were employed. However, so far, in the open literature, the drag force performances of the cavities with the different geometric configurations in the supersonic flow have not been investigated and compared, but it is a critical technique to be solved in the design process of the cavity flame holder [14].…”

Section: Introductionmentioning

confidence: 99%

Drag force investigation of cavities with different geometric configurations in supersonic flow

Luo

Huang

Liu

et al. 2011

Sci. China Technol. Sci.

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In order to prolong the residence time of the flow retaining in the supersonic flow, wall cavity has been widely applied in the scramjet combustor, and this affects the aerodynamic surface and imposes additional drag force on the hypersonic propulsion system. The two-dimensional coupled implicit Reynolds Averaged Navier-Stokes (RANS) equations and the RNG k−ε turbulent model were employed to investigate the flow fields of cavities with different geometric configurations, namely the classical rectangular, triangular and semi-circular, and the cavities with the fixed depth and length-to-depth ratio. At the same time, the drag force performances of the cavities were estimated and compared. The obtained results show that the numerical results are in very good agreement with the experimental data, and the different scales of grid make only a slight difference from the numerical results. The intensity of the trailing shock wave is much stronger than that of the leading one, and the area around the trailing edge of the cavities plays an important role in the chemical reaction in the scramjet combustor. With the fixed depth and length-to-depth ratio, the triangular cavity can strengthen the turbulent combustion in the scramjet combustor further, but impose the most additional drag force on the scramjet engine. The classical rectangular one can impose the least additional drag force on the engine, but the function of strengthening the combustion is the weakest. The influence of the semi-circular one is the moderate, but the machining process is more complex than the other two configurations. aerospace propulsion systems, cavity, drag force, scramjet engine, hypersonic vehicle Citation: Luo S B, Huang W, Liu J, et al. Drag force investigation of cavities with different geometric configurations in supersonic flow.

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“…Kostecki [3] predicted the two-dimensional flow field in the vicinity of an underflow vertical lift gate using numerical combinative modeling of the vortex method and the boundary element method. Ozalp et al [4]'s experiments in a large scale water channel were carried out in order to investigate the flow structure in rectangular, triangular and semi-circular cavity respectively using the PIV technique. In this paper, the mechanism of gate vibration and variation of hydraulic parameters with slot and without slot are studied by analyzing the vortices in the flow field behind plane gate.…”

Section: Introductionmentioning

confidence: 99%

An Experimental Investigation of the Effect of Slot Vortex on Plane Gate Vibration

Shen¹,

He²,

Wang³

et al. 2017

Proceedings of the 2017 6th International Conference on Energy and Environmental Protection (ICEEP 2017)

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Experimental measurement of flow past cavities of different shapes

Cited by 74 publications

References 18 publications

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

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

Drag force investigation of cavities with different geometric configurations in supersonic flow

An Experimental Investigation of the Effect of Slot Vortex on Plane Gate Vibration

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