L. <i>On the action of sonorous vibrations on gaseous and liquid jets</i>

Tyndall,

doi:10.1080/14786446708639803

Cited by 18 publications

(8 citation statements)

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“…Leconte's (1858) studies of the sensitivity of flames to sound, Tyndall's (1867) bifurcating smokestack plumes, and Brown's (1935) experiments on control of jet spreading by acoustic interaction, are among the oldest related literature. Research in the modern era was stimulated greatly by the work on large-scale structures in turbulent mixing layers by Brown & Roshko (1974), after which the Caltech group continued to make important contributions.…”

Section: Related Fundamental Researchmentioning

confidence: 99%

BIFURCATING AND BLOOMING JETS

Reynolds

Parekh

Juvet

et al. 2003

Annu. Rev. Fluid Mech.

182

106

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It is classically assumed that the far field of a round turbulent jet discharging into quiescent fluid has a unique behavior characterized only by its momentum flux. However, there is now considerable evidence that different discharge conditions at the jet nozzle exit can give rise to very different far-field flows. Perhaps the most striking examples of these are the bifurcating and blooming jets produced by appropriate combinations of controlled axial and circumferential excitations at the nozzle exit. With the right excitations, a jet can be made to divide into two separate jets (bifurcating jet), each of which carries half the axial momentum and spreads in a manner similar to a single jet. Trifurcating jets can also be produced. Other excitations can produce blooming jets, in which the jet explodes into a shower of vortex rings, producing a far-field flow that is quite unlike a normal unexcited jet. Bifurcating and blooming jets exhibit much greater mixing than normal jets, suggesting possible applications in flow control. This article summarizes our work on bifurcating and blooming jets, which began with our discovery of them in the early 1980s and continued through the mid1990s. One of us (D.E.P.) continued exploration of flow control using excited jets, first at the McDonnell Douglas Corporation, and more recently at the Georgia Institute of Technology. The key to flow control is the manipulation of the large vortical structures in the near field of the jet. Ultimately this work, and that of others, led to full-scale testing of jet engine exhaust mixing control. There it was shown that the jet temperature downstream of the engine can be very significantly reduced by application of well-designed and easily implemented excitation at the engine discharge, thereby solving problems encountered during ground operations. Related jet control work by other investigators is included in this review.

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Section: Related Fundamental Researchmentioning

confidence: 99%

BIFURCATING AND BLOOMING JETS

Reynolds

Parekh

Juvet

et al. 2003

Annu. Rev. Fluid Mech.

182

106

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“…A characteristic of resonant flows is their tendency to exhibit "staging" behaviour, whereby small changes in operating conditions can produce large jumps in the frequency of the tone associated with the resonance loop. This was explained by Powell as a consequence of the need to simultaneously satisfy equations (1) and (2): since N must be an integer value, and as at least some of the terms in equation (2) are frequency dependent, at some conditions a maximization of equation (2) will be achieved by a change in N, and thus a step change in frequency according to equation (1). An example of staging behaviour as observed in a screeching elliptical jet is provided in Figure 4, where discontinuous changes in tone frequency are observable at M j ¼ 1.06, 1.4, and 1.45.…”

Section: Introductionmentioning

confidence: 99%

Aeroacoustic resonance and self-excitation in screeching and impinging supersonic jets – A review

Edgington-Mitchell

2019

International Journal of Aeroacoustics

172

104

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Supersonic jets, particularly shock-containing jets, often exhibit high-intensity, discrete-frequency acoustic tones. These tones are the signature of an aeroacoustic resonance loop established by the flow. This paper considers two of the classical forms of supersonic jet resonance: screech in shock-containing free jets and tones generated by the impingement of a jet against a surface. The first half of the paper provides a historical perspective on research into both forms of resonance, ranging from the seminal works of Alan Powell to recent contributions from high-fidelity numerical simulation, experiment, and stability theory. The second half of the paper provides a critical assessment of current understanding around the four processes that characterize jet resonance: a downstream propagation of energy, an acoustic generation mechanism, an upstream propagation of energy, and a receptivity mechanism.

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“…This instability is called the Kelvin-Helmholtz instability, with an essentially inviscid mechanism. Interestingly, although the rigorous analysis of instability in FSL did not begin until the 1960s, it had been noticed in gaseous and liquid jets in the second half of the 19th century [9][10][11]. The second discovery was the existence of coherent LSS in FSL, even at relatively high Reynolds number.…”

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confidence: 99%

Excitation of Free Shear-Layer Instabilities for High-Speed Flow Control

2018

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Free shear layers are building blocks of many flows of interest in applications, including jets, cavity flows, and separated flows. It was found several decades ago that free shear layers are unstable to small perturbations over a wide range of frequencies, that they are dominated by coherent large-scale structures (even at high Reynolds numbers), and that the dynamics of these structures dominate important processes: entrainment, mixing, momentum transport, and noise generation. These findings motivated extensive research activities to actively control their development using excitation of instabilities, but early experimental research focused primarily on the control of low-speed, low-Reynolds-number free shear layers. This extensive body of the literature is briefly reviewed. The authors' recent work using localized arc filament plasma actuators in jets shows that free shear layers respond to the excitation over a large range of conditions that have been explored: jet Mach number (up to 1.65), convective Mach number (up to 1), and Reynolds number (up to 1.65 × 10 6). However, the nature of large-scale structures, shear-layer growth rate, and generation of Mach waves all depend on the jet Mach number and compressibility level. The results clearly demonstrate the similarity of instability processes and development of large-scale structures in free shear layers, regardless of the Mach or Reynolds numbers. Nomenclature

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L. On the action of sonorous vibrations on gaseous and liquid jets

Cited by 18 publications

References 0 publications

BIFURCATING AND BLOOMING JETS

BIFURCATING AND BLOOMING JETS

Aeroacoustic resonance and self-excitation in screeching and impinging supersonic jets – A review

Excitation of Free Shear-Layer Instabilities for High-Speed Flow Control

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