Some interaction properties between a turbulent jet and a pure tone excitation

Bechert, D. W.; Pfizenmaier, E.; Michel, U.

doi:10.1007/bfb0012627

Cited by 2 publications

(1 citation statement)

References 9 publications

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“…21,29,30 Therefore, the theory presented above which is based on the diffraction solution can be partly verified by means of careful far field measurements. 21,31 In the present work azimuthal decomposition technique (ADT) 32 was used for the far-field verification of the theory. The measurements described in Ref.…”

Section: Experimental Validation Of Single Instability Wave Far Fmentioning

confidence: 99%

Instability Wave Control in Turbulent Jet

Zaitsev¹,

Faranosov²,

Kopiev³

et al. 2013

19th AIAA/CEAS Aeroacoustics Conference

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This paper presents experimental investigations of possibility of instability waves acoustic control in jet shear layer. Basic possibility of artificial hydrodynamic instability wave suppression in turbulent jet by external acoustic action, which was predicted theoretically, is demonstrated in experiment. Two jet velocities are considered for control demonstration -50 m/s and 280 m/s. This result may be used for designing jet noise active control system. Nomenclature A = amplitude of the control action B = amplitude of the initial excitation c = sound speed h = normal interface displacement k = real positive wavenumber M = Mach number V 0 = mean flow velocity α = complex wavenumber ϕ = velocity potential θ = grazing angle of the acoustic plane wave ω = circular frequency

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Section: Experimental Validation Of Single Instability Wave Far Fmentioning

confidence: 99%

Instability Wave Control in Turbulent Jet

Zaitsev¹,

Faranosov²,

Kopiev³

et al. 2013

19th AIAA/CEAS Aeroacoustics Conference

View full text Add to dashboard Cite

show abstract

Noise Control of a High Reynolds Number High Speed Heated Jet Using Plasma Actuators

Kearney-Fischer¹,

Kim²,

Samimy³

2011

International Journal of Aeroacoustics

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Localized arc filament plasma actuators (LAFPAs) have been used to control the flow and farfield acoustics of high Reynolds number, high-speed unheated jets at the Gas Dynamics and Turbulence Laboratory. The jet facility consists of an axisymmetric jet of exit diameter 2.54 cm with different nozzle blocks and variable jet temperature in an anechoic chamber. The focus of this paper is on the effect of control on far-field noise in a high subsonic (M j = 0.9) jet over a wide range of temperatures. A total of sixteen combinations of forcing azimuthal modes (m = 0, 1, 3, and ±4) and temperature ratios (T o /T a = 1.0, 1.5, 2.0, and 2.5) at a wide range of forcing frequencies were utilized to explore LAFPAs' effect on far-field noise. LAFPAs show significant noise reduction around the peak frequency in shallow angles and a small increase in higher frequencies. The level of reduction is lower and the level of increase is higher towards the sideline. Consistent with previous works, the results show that forcing with higher azimuthal modes produces greater noise reduction. LAFPAs produce large amplitude narrowband tones in this small jet that are believed to be less significant in larger jets. The impact of these forcing tones is isolated and discussed. Across the range of temperatures explored, the effectiveness of LAFPAs improves as temperature increases. Possible reasons for the increase in effectiveness are discussed.

show abstract

Some interaction properties between a turbulent jet and a pure tone excitation

Cited by 2 publications

References 9 publications

Instability Wave Control in Turbulent Jet

Instability Wave Control in Turbulent Jet

Noise Control of a High Reynolds Number High Speed Heated Jet Using Plasma Actuators

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