Suppression of cavity resonance using high frequency forcing - The characteristic signature of effective devices

Stanek, M.; Raman, Ganesh; Kibens, Valdis; Ross, John; Odedra, Jessaji; Peto, James

doi:10.2514/6.2001-2128

Cited by 47 publications

(21 citation statements)

References 12 publications

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“…Increasing effort is now being directed towards the hybrid method first proposed by Strelets (6) and known as detached eddy simulation (DES). This paper compares the use of URANS and DES for an empty rectangular cavity at Mach number 0·85 corresponding to the M219 configuration used in experiments by QinetiQ (7,8,9) . Some supporting evidence for the unsuitability of URANS for this particular configuration can be obtained through a spectral analysis of the LES data generated at ONERA and analysed in great detail in (Refs 4,5).…”

Section: Introductionmentioning

confidence: 99%

Prediction of acoustic resonance phenomena for weapon bays using detached eddy simulation

Ashworth

2005

Aeronaut. j.

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It is argued that acoustic resonance phenomena in open cavities such as weapons bays cannot be adequately predicted through numerical solution of Reynolds averaged Navier-Stokes (RANS) equations. The requirement to resolve the growth of the shear layer instability from the lip of the cavity inevitably implies that turbulence further downstream is resolved while also being modelled thus making RANS over dissipative. Large eddy simulation (LES) models only unresolved scales and a hybrid method combining RANS near walls with LES in the cavity appears a practical alternative to pure RANS. This paper compares computations of the M219 cavity configuration made with unsteady RANS and with the hybrid method known as detached eddy simulation (DES). It is shown that whilst unsteady RANS and DES give very similar predictions for the 1 st and 3 rd modes of the acoustic resonance the 2 nd mode (which is dominant near the centre of the cavity) is absent in the RANS results but well predicted by DES. The 2 nd mode is thought to arise from an interaction with vortical structures in the shear layer which are suppressed in the highly dissipative RANS method. The 4 th mode, which is much weaker than the other three modes, is over-predicted by DES and under-predicted by a smaller amount in RANS.

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Section: Introductionmentioning

confidence: 99%

Prediction of acoustic resonance phenomena for weapon bays using detached eddy simulation

Ashworth

2005

Aeronaut. j.

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“…2). A powered resonance-tube bank (PRTB) was developed 17 and was subsequently tested by Stanek et al 18,19 Later Cain et al 20 also studied the highfrequency excitation phenomenon through simulations of a plane transitional wake. In addition, illustrative flow-visualization images of the functioning of PRT devices is shown in the paper by Kastner and Samimy.…”

Section: Search For a High-frequency Excitation Devicementioning

confidence: 99%

Development of Powered Resonance-Tube Actuators for Aircraft Flow Control Applications

Raman

Mills

Kibens

2004

Journal of Aircraft

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The present paper addresses both active-flow-control actuator technology development and the demonstration of the effectiveness of actuators that could be easily integrated into practical aircraft applications. The actuator used is an adaptation of the Hartmann oscillator. Demonstration experiments that illustrate the effectiveness of this actuator include cavity tone suppression at transonic speeds and the reduction of jet-impingement tones. The actuator concept is based on a high-speed jet aimed at the mouth of a cylindrical tube closed at the other end. The result is a high-amplitude self-sustaining fluctuating field accompanied by an intense narrowband tone, all in the region between the supply jet and the resonance tube. Using unsteady pressure sensors and flow visualization, we explored the effect of varying actuator parameters such as the spacing between the power jet and the resonance tube, supply pressure, resonance-tube depth, diameter, shape, and lateral spacing. By varying the depth of the tube, the frequency could be varied from about 1.6 kHz to over 10 kHz and amplitudes as high as 156 dB (microphone location dependent) were obtained in the vicinity of actuation. To integrate this concept into practical aircraft applications, two generations of a more complex version of this device known as the powered resonance-tube bank (PRTB) were developed and demonstrated. Results indicate that by using high-frequency excitation at 5-kHz suppression levels in excess of 20 dB were consistently obtained over a range of operating conditions in both cavity and impingement flow situations. Based on our results, we have grounds to believe that a properly designed PRTB has significant advantages over conventional actuators such as acoustic, piezo, and oscillatory microstructures. Introduction I N this paper we describe the development of novel powered resonance-tube actuators. The actuators operate over a range of frequencies and produce high amplitudes of pressure fluctuations. Such actuators are attractive alternatives to conventional electromagnetic and piezoelectric actuators. The conventional actuators are fragile and have high power and maintenance requirements. This paper describes our attempts to harness the oscillatory field of the Hartmann oscillator by suitable adaptation and integration. The final result is a high-frequency actuator with no moving parts that can inject high-amplitude fluctuations into a flow that we wish to control. Such actuators could eventually replace steady mass-addition methods with oscillatory addition of fluid at lower mass-flow (bleed) levels. Two examples of applications (cavity and impinging jet) that demonstrate the effectiveness of this type of actuator are also provided.The role of an actuator is to inject perturbations at a prescribed frequency, amplitude, and mode (spanwise or azimuthal) at locations where the flow is most receptive to these inputs. The actuation then leverages or disrupts the flow to bring about a desired effect. An example of leveraging is the excitation ...

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“…Other examples of fl ow control by high-frequency excitation include the development by of the powered resonance tube actuator to suppress jet impingement tones, and the work of Stanek et al (2001) on suppressing resonant tones in cavities. These experiments demonstrated that open-loop, low-amplitude actuation could be effective in controlling the large-scale features of a shear-layer fl ow.…”

Section: B Modern Afc In Canonical Flowsmentioning

confidence: 99%

Fundamentals and Applications of Modern Flow Control

Joslin¹,

Miller²,

Miller³

2009

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Suppression of cavity resonance using high frequency forcing - The characteristic signature of effective devices

Cited by 47 publications

References 12 publications

Prediction of acoustic resonance phenomena for weapon bays using detached eddy simulation

Prediction of acoustic resonance phenomena for weapon bays using detached eddy simulation

Development of Powered Resonance-Tube Actuators for Aircraft Flow Control Applications

Fundamentals and Applications of Modern Flow Control

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