On the near Field Pressure of a Transonic Axisymmetric Jet

Ukeiley, Lawrence; Ponton, Michael K.

doi:10.1260/147547204323022257

Cited by 62 publications

(42 citation statements)

References 34 publications

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“…A value of 0.69 was also reported for a Mach 0.85 jet. 14 Figure 5(a) presents the power spectral density (PSD) plots for the unforced jets measured at x = 4D. A good collapse of the data is observed with the scaling using Strouhal number and the nozzle exit dynamic head.…”

Section: A Experimental Observationsmentioning

confidence: 77%

The impulse response of a high-speed jet forced with localized arc filament plasma actuators

et al. 2012

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Experimental study of planar opposed jets with acoustic excitation Phys. Fluids 25, 014108 (2013) Similarity analysis of the momentum field of a subsonic, plane air jet with varying jet-exit and local Reynolds numbers Phys. Fluids 25, 015115 (2013) Electrohydrodynamic printing under applied pole-type nozzle configuration Appl. Phys. Lett. 102, 024101 (2013) Effects of fluid properties and laser fluence on jet formation during laser direct writing of glycerol solution J. Appl. Phys. 112, 083105 (2012) We present experimental and theoretical analyses of the response of high-speed, highReynolds-number, round jets to impulsive forcing with arc-filament-plasma actuators. The impulse response is obtained with forcing Strouhal numbers, based on the nozzle exit diameter and exit center line velocity, less than 0.1. The resulting phase-averaged near-field pressure signature displays a compact wave with a positive peak preceding a negative one, indicative of a large scale structure in the shear layer of the jet. Scaling laws derived by operating the jet at four subsonic Mach numbers are used to distinguish this hydrodynamic component of the phase-averaged jet response from the direct actuator noise. As the forcing frequency increases, the compact waves in the near-field pressure signal overlap each other, indicating interaction of the growing seeded structures. For this regime, the phase-averaged response is approximately replicated by linear superposition of the impulse response, thereby demonstrating the quasi-linearity of structure interaction. A novel application of linear parabolized stability theory yields a successful model of the impulse response. C 2012 American Institute of Physics. [http://dx

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Section: A Experimental Observationsmentioning

confidence: 77%

The impulse response of a high-speed jet forced with localized arc filament plasma actuators

et al. 2012

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“…The magnitude of the aerodynamic pressure however decreases rapidly with the radial distance from the jet axis. Measurements of near-field pressure reported in the literature [28,29] for Mach 0.5 and 0.85 jets suggest for instance that aerodynamic pressure is not predominant at r = 15r 0 , for x ≤ 30r 0 . Arndt et al [30] also noticed that the near-field pressure fluctuations are acoustic for wave numbers kr > 2.0.…”

Section: Definition Of the Observation Pointsmentioning

confidence: 99%

“…The possible sound sources located near the nozzle exit are consequently lacking. However, as shown by near-field pressure measurements [28,29], these sources generate high-frequency noise (typically at St ≥ 2). They are thus expected not to contribute significantly to the range of noise spectra, St < 2, calculated in the present simulations, where the predominant components of jet noise are observed.…”

Section: Definition Of the Simulationsmentioning

confidence: 99%

Investigation of downstream and sideline subsonic jet noise using Large Eddy Simulation

Bogey

Bailly

2006

Theor. Comput. Fluid Dyn.

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The sound fields radiated by Mach number 0.6 and 0.9, circular jets with Reynolds numbers varying from 1.7 × 10 3 to 4 × 10 5 are investigated using Large Eddy Simulations. As the Reynolds number decreases, the properties of the sound radiation do not change significantly in the downstream direction, whereas they are modified in the sideline direction. At low Reynolds numbers, for large angles downstream from the jet axis, the acoustic levels are indeed remarkably lower and a large high-frequency part of the sound spectra vanishes. For all Reynolds numbers, the downstream and the sideline sound spectra both appear to scale in frequency with the Strouhal number. However their peak amplitudes vary following two different velocity exponents according to the radiation direction. The present observations suggest the presence of two sound sources: a Reynolds number-dependent source, predominant for large radiation angles, connected to the randomlydeveloping turbulence, and a deterministic source, radiating downstream, related to a mechanism intrinsic to the jet geometry, which is still to be comprehensively described. This view agrees well with the experimental results displaying two distinguishable components in turbulent mixing noise [1,2]. Keywords

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“…These spectra are plotted for the range [0. [2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20].…”

Section: Far Field Pressurementioning

confidence: 99%

“…Several authors such as Ukeiley and Ponton [16], Suzuki and Colonius [17], Muller et al [19], Fayard et al [20], or Hall et al [21] highlighted the importance of the low order azimuthal modes particularly for position close to the potential core end. Previously, Lorteau et al [22] performed an analysis of the near field pressure from an experimental database of an isothermal and a hot subsonic jet.…”

Section: Introductionmentioning

confidence: 99%