Suppression of Cavity Loads Using Leading-Edge Blowing

Arunajatesan, Srinivasan; Kannepalli, Chandrasekhar; Sinha, Neeraj; Sheehan, Michael; Alvi, Farrukh S.; Shumway, George; Ukeiley, Lawrence

doi:10.2514/1.38211

Cited by 50 publications

(16 citation statements)

References 16 publications

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“…10 The fluctuating values also appear to be slightly increased from the baseline case, which is consistent with the results of Arunajatesan et al (2009). Again, the effect is less evident for the 5-slot case, but the trends are still present.…”

Section: Streamwise-aligned Velocity Measurement Planessupporting

confidence: 89%

“…One aim of the current work is to confirm this hypothesis through velocity field measurements. The experimental study reported in Ukeiley et al (2008) was followed up by a numerical study of similar conditions reported in Arunajatesan et al (2009). There, the surface pressure reductions and some of the effects of the control on the flow in the cavity shear layer were reported.…”

Section: Introductionmentioning

confidence: 91%

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Leading edge slot blowing on an open cavity in supersonic flow

2012

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Supersonic flow over an open cavity can create intense pressure loads on the surfaces within the cavity. In order to combat these loads, the development of a control scheme to reduce them is becoming increasingly important for many engineering applications. The present study implements steady leading edge blowing through various configurations of spanwise-aligned rectangular leading edge slots. The effects of this control on the flow field were examined to determine the suppression mechanisms exploited by the leading edge blowing. The cavity studied here had a length-to-depth ratio of 6 and was placed in a freestream flow with a Mach number of 1.4. Actuators with one continuous slot and three and five segmented slots spanning the width of the cavity were installed at the leading edge. Surface pressure reductions of nearly 45% were achieved on the aft wall of the cavity using the 5-slot configuration. Velocity field measurements acquired through 2-component (streamwise-aligned measurement plane) and 3-component stereoscopic (cross-stream-aligned measurement plane) particle image velocimetry revealed the presence of streamwise-aligned vortices created by the segmented slots. These act to significantly alter the shear layer formed at the mouth of the cavity creating highly three-dimensional flow field features.

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Section: Streamwise-aligned Velocity Measurement Planessupporting

confidence: 89%

Section: Introductionmentioning

confidence: 91%

Leading edge slot blowing on an open cavity in supersonic flow

2012

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“…Fluids 25, 086101 (2013) 19 2.54 1.0 1.8 5.18 × 10 6 /m Two perforated plates with 175 holes Wilcox 20 4-18 1.6-2.86 6.56 × 10 6 /m Mass transport through a porous cavity floor Lamp and Chokani 23 4.33 2D c 1.75 5.58 × 10 7 /m A steady or pulsed jet placed within the cavity below the front cavity lip Bueno et al 24 5-9 3 2 3.0 × 10 7 /m Six high frequency pulsed jets located just upstream of LE b Rizzetta and Visbal 25 5 0.5 1. 19 2 × 10 5 (L) Pulsed jet at a very high frequency located at LE b Ukeiley et al 26 5.5 3 1.5 1.0 × 10 5 (δ) Microjets and rectangular slot jets spaced along LE b Zhuang et al 6 5.16 0.87 2 2.8 × 10 6 (L) An array of supersonic microjets spaced along LE b Arunajatesan et al 27 5.6 0.55 1.5 1.0 × 10 5 (δ) A set of three slots spanning LE b Lusk et al 29 Among various active noise control methods, fluid mass injection is a promising candidate. Here a brief review is presented (Table I).…”

Section: -2mentioning

confidence: 98%

“…The microjet noise control led to reductions of up to 20 dB in the cavity tones and reductions of more than 9 dB in the overall sound pressure levels. Arunajatesan et al 27 did hybrid RANS/LES simulations, and stated that the primary mechanism for the noise reduction was the breakup of spanwise coherence in the shear layer into smaller vortical structures, thus reducing the shear layer flapping and leading to a smaller pressure imprint on the downstream cavity wall. Using a cavity acoustics model developed by Sahoo and Annaswamy, 28 the role of microjets in cavity noise suppression was explained and predicted for a given noise control input.…”

Section: -2mentioning

confidence: 98%

Mechanism of controlling supersonic cavity oscillations using upstream mass injection

Nonomura

Fujii

2013

Physics of Fluids

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The mechanism of controlling supersonic cavity oscillations using upstream mass injection is investigated by implicit large-eddy simulations of a turbulent flow (M∞ = 2.0, ReD = 105) past a rectangular cavity with a length-to-depth ratio of 2. The mass injection is simulated by specifying a vertical velocity profile of a jet ejecting steadily through a slot placed at the upstream of the cavity leading edge. The results show that the steady upstream mass injection produces significant attenuation of the cavity oscillations, and two primary mechanisms are demonstrated to be directly responsible for the noise suppression: lifting up of the cavity shear layer, and damping of the shear-layer instability. It is found that the case of low mass flow injection investigated is more effective in stabilizing the cavity shear layer than the high mass flow injection. A transition stage might exist between two well-developed oscillating modes, but “mode-switching” is not observed.

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“…Even today, the complete understanding of flow physics remains elusive and modeling of cavity flows to calculate frequencies and amplitudes of the oscillations continues to be a challenging task. Several control techniques (Vakili and Guthier 1994;Cattafesta et al 1999;Zhuang et al 2006;Ukeiley et al 2002;Stanek et al 2003;Bueno et al 2002;Sarno and Franke 1994;Sarohia and Massier 1977;Sahoo et al 2005;Arunajatesan et al 2009) have been examined and employed in the past to control the cavity oscillations. These include both passive and active control methods.…”

Section: List Of Symbols Lmentioning

confidence: 99%

Nonlinear aspects of supersonic flow past a cavity

Vikramaditya

Kurian

2012

Exp Fluids

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Study of supersonic flow over wall-mounted cavities for two different length/depth (L/D) ratios is carried out experimentally. Unsteady pressure measurements were made on the front and aft walls of the cavity. Data analysis was performed on the experimental results so obtained. Spectra of the unsteady pressure data exhibit multiple tones. Higher-order spectral technique is implemented on the unsteady pressure data to ascertain whether these multiple tones are due to possible nonlinear interactions between the primary cavity modes (Rossiter modes) or not. Significant nonlinear interactions in the form of both sum and difference frequencies between the cavity modes are observed in both the cavities. The spectra of the cavity with L/D ratio 2 show distinct peaks due to nonlinear interactions while the cavity with L/D ratio 3 does not exhibit observable peaks in the spectra. The spectra of both the cavities show presence of low-frequency peaks of significant amplitudes. These low-frequency modes interact with the primary cavity modes to produce significant bicoherence values. The reasons for their existence could not be predicted. It is identified that the dominant mode in the spectra of the cavities is critical for most of the interactions observed.

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Suppression of Cavity Loads Using Leading-Edge Blowing

Cited by 50 publications

References 16 publications

Leading edge slot blowing on an open cavity in supersonic flow

Leading edge slot blowing on an open cavity in supersonic flow

Mechanism of controlling supersonic cavity oscillations using upstream mass injection

Nonlinear aspects of supersonic flow past a cavity

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