Suppression of pressure oscillations in an open cavity by passive pneumatic control

Chokani, Ndaona; Kim, I.

doi:10.2514/6.1991-1729

Cited by 28 publications

(6 citation statements)

References 1 publication

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“…The second category on the other hand is controlling cavity oscillations passively by means of adding geometric modifications at the cavity edges. For example, rounding (Pereira & Sousa, 1994), ramps (Janzen et al, 2007 andKnotts &Selamet, 2003), spoilers (Bruggeman et al 1991, Karadogan & Rockwell 1983, and a passive bleed system (Chokani & Kim, 1991). Cattafesta (2008 ) also arranged the active group into two more branches, open-loop and closed-loop.…”

Section: Suppression Methodsmentioning

confidence: 99%

Effect of Upstream Edge Geometry on the Trapped Mode Resonance of Ducted Cavities

Bolduc

Elsayed

Ziada

2013

Volume 4: Fluid-Structure Interaction

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Gas flow over ducted cavities can excite strong acoustic resonances within the confined volumes housing the cavities. When the wavelength of the resonant acoustic modes is comparable to, or smaller than, the cavity dimensions, these modes are referred to as trapped acoustic modes. The excitation mechanism causing the resonance of these trapped modes in axisymmetric shallow cavities has been investigated experimentally in a series of papers by Aly & Ziada [1–3]. In this paper, the same experimental set-up is used to investigate the effect of the upstream edge geometry on the acoustic resonance of trapped modes. The investigated geometries include sharp and rounded cavity corners, chamfering the upstream edge, and spoilers of different types and sizes. Rounding off the cavity edges is found to increase the pulsation amplitude substantially, but the resonance lock-on range is delayed, i.e. it is shifted to higher flow velocities. Similarly, chamfering the upstream corner delays the onset of resonance, but does not increase its intensity. Spoilers, or vortex generators, added at the upstream edge have been found to be the most effective means to suppress the resonance. However, the minimum spoiler size which is needed to suppress the resonance increases as the cavity size becomes larger.

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Section: Suppression Methodsmentioning

confidence: 99%

Effect of Upstream Edge Geometry on the Trapped Mode Resonance of Ducted Cavities

Bolduc

Elsayed

Ziada

2013

Volume 4: Fluid-Structure Interaction

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“…He found that the slanted trailing edge was very effective in controlling the cavity tones but the leading-edge spoilers were not fully successful. Chokani and Kim [8] studied computationally to determine the effectiveness of a passive suppression technique in suppressing the oscillations in a cavity exposed to a supersonic flow. They found not only the suppression of oscillations but also some useful attenuations of cavity resonant drag in their investigation.…”

Section: Introductionmentioning

confidence: 99%

“…For these reasons the area of cavity flow has attracted the researchers for years. In spite of numerous research investigations [1][2][3][4][5][6][7][8][9][10][11][12], the understanding of the flow physics governing behavior of cavity flow and the practical methods of suppressing cavity-induced pressure oscillations have not been studied adequately.…”

Section: Introductionmentioning

confidence: 99%

A computational investigation on the control of cavity-induced pressure oscillations using sub-cavity

et al. 2006

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A computational investigation has been conducted to determine the effectiveness of a passive control technique of attenuating cavity-induced pressure oscillations in a confined two-dimensional supersonic flow. The passive control technique is achieved by fitting two flat plates near the front wall of a square cavity at Mach number 1.83 at the cavity entrance. The results showed that the flat plates attached near the front wall of the cavity, discouraged the formation of feedback loop which is widely believed to be the reason of cavity resonance. The resultant amount of attenuation of pressure oscillations was also dependent on the length of the flat plate used as an oscillation suppressor.

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“…Active control provides external energy (e.g., mechanical or electrical) input to an adjustable actuator to control the flow, while passive control techniques do not. Passive control of cavity oscillations has been successfully implemented via geometric modifications using, for example, fixed fences, spoilers, ramps, Bliss, 1975 andShaw, 1979) and a passive bleed system (Chokani and Kim, 1991). Note that some control devices considered passive by this classification extract energy from the flow itself and have been called 'active' by other researchers.…”

Section: Control Of Cavity Flowsmentioning

confidence: 99%

On the Flow Physics of Effectively Controlled Open Cavity Flows

Ukeiley¹,

Cattafesta²

2013

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Standard Form 298 (Rev. 8/98) REPORT DOCUMENTATION PAGEPrescribed by ANSI Std. Z39.18 Form Approved OMB No. 0704-0188The public reporting burden for this collection of information is estimated to average 1 hour per response, including the time for reviewing instructions, searching existing data sources, gathering and maintaining the data needed, and completing and reviewing the collection of information. Send comments regarding this burden estimate or any other aspect of this collection of information, including suggestions for reducing the burden, to the Department of Defense, Executive Services and Communications Directorate (0704-0188). Respondents should be aware that notwithstanding any other provision of law, no person shall be subject to any penalty for failing to comply with a collection of information if it does not display a currently valid OMB control number.

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Suppression of pressure oscillations in an open cavity by passive pneumatic control

Cited by 28 publications

References 1 publication

Effect of Upstream Edge Geometry on the Trapped Mode Resonance of Ducted Cavities

Effect of Upstream Edge Geometry on the Trapped Mode Resonance of Ducted Cavities

A computational investigation on the control of cavity-induced pressure oscillations using sub-cavity

On the Flow Physics of Effectively Controlled Open Cavity Flows

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