Modulation of a Liquid-Fuel Jet in an Unsteady Cross-Flow

Anderson, Torger J.; Proscia, W.M.; Cohen, Jeffrey M.

doi:10.1115/2001-gt-0048

Cited by 9 publications

(8 citation statements)

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“…( 0 represents the bulk velocity) is equal to about 35% in the work by Anderson et al [19], whereas values between 5% and 20% are reported by Song et al [21]. Whereas Anderson et al [19] obtained a huge oscillation of the liquid column linked with an influence on the spatial distribution of the spray particle number density, Song et al [21] observed very little influence of the excitation on the jet trajectory but a periodic variation of the droplet size distribution. More recently, Sharma and…”

Section: Simulation Des Instabilités De Combustion Générées Dans Les mentioning

confidence: 86%

Characterization of Confined Liquid Jet Injected into Oscillating Air Crossflow

Bodoc

Desclaux

Gajan

et al. 2019

Flow Turbulence Combust

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The aim of this work is to study the role of the liquid phase in the thermo-acoustic coupling that leads to combustion instabilities. In multipoint injection systems, the liquid fuel is injected through orifices as jets which are destabilized by the high-speed air flowing in a transverse direction. This paper is focused on the effect of an acoustic excitation imposed on the air flow on the various liquid features observed in actual fuel injection systems. This concerns the initial jet trajectory, its breakup, the formation and transport of the resulting spray, the liquid film formation on walls and its final atomization at the outlet of the injection system. Experimental investigations were performed on a simplified geometry designed to reproduce these main phenomena. Phaseaveraged processing of the experimental data is used to analyze the relationship between the acoustic excitation and the liquid phase behavior. In particular, the phase delays imposed by the various processes involved are analyzed. The processing of high-speed video recordings reveals harmonic oscillation of the liquid column which periodically breaks into a spray structure or impacts the opposite wall, forming a liquid film. Using PDA measurements, it is shown that the resulting two-phase flow consists of alternating dense and diluted zones transported by the air flow. At the end of the channel, the liquid film flowing on the wall opposite the liquid jet is periodically atomized through the oscillating shear forces imposed by the air flow.

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Section: Simulation Des Instabilités De Combustion Générées Dans Les mentioning

confidence: 86%

Characterization of Confined Liquid Jet Injected into Oscillating Air Crossflow

Bodoc

Desclaux

Gajan

et al. 2019

Flow Turbulence Combust

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“…Depending on the amplitude and frequency of the air velocity oscillations and the averaged momentum flux ratio q between the two fluids, the liquid jets may cyclically impact the inner or the upper wall of the injection system forming a liquid film which is re-atomized at the edge of the diffuser. Such coupling between the air crossflow and the atomization of a liquid jet was shown by Anderson et al (Anderson, Proscia & Cohen 2001), Song and Lee (Song, Ramasubramanian & Lee 2013) and Sharma and Lee (Sharma & Lee 2018).…”

Section: Introductionmentioning

confidence: 64%

Experimental and Numerical Characterization of a Liquid Jet Injected into Air Crossflow with Acoustic Forcing

Desclaux

Thuillet

Zuzio

et al. 2020

Flow Turbulence Combust

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This paper focus on the dynamic of a spray issued from the shearing of a liquid jet injected in an air crossflow submitted to high acoustic perturbations. Experimental and numerical approaches are used. Characterization of the liquid jet close to the injection location is obtained from high speed visualizations performed with a back lighting technique. Phase Doppler Anemometry gives useful information on the spray dynamics. The phase-averaged post processing method is chosen to describe the flow oscillations during the excitation cycle. The numerical simulation is performed with the multi-scale LES approach. This method couples a multi-fluid solver for the liquid jet body with a dispersed phase solver dealing with the atomized spray. The experimental results show a swigging phenomenon of the liquid jet and the existence of velocity and concentration waves travelling downstream of the liquid jet. Coupled phenomena between the crossflow, the atomization of the liquid jet and the transport of droplets are observed, revealing different wave transport velocities. The numerical simulation is able to capture the global swinging phenomenon of the liquid jet main body as well. A very good agreement is obtained for the jet trajectories oscillations obtained either by the simulation or from the experiment during the whole excitation cycle.

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“…The actuator used to force the jet is a spinning valve developed at UTRC [1]. Air supply is provided to a plenum inside a rotating drum (which is connected to a motor spool) with 40 holes around the periphery; see schematic in Fig.…”

Section: Spinning-valve Actuator and Azimuthal Mode Generationmentioning

confidence: 99%

“…The experiments reported in this paper were performed in two campaigns. In the first one, the actuator system was reused from the original development [1] so that its utility for jet noise mitigation could be established preliminarily. In particular, the injector was essentially a flattened tube with the flat edge aligned parallel to the nozzle trailing edge (see Fig.…”

Section: Spinning-valve Actuator and Azimuthal Mode Generationmentioning

confidence: 99%

“…In this paper, we present results from the application of a spinningvalve actuator for steady or pulsed air injection close to the nozzle lip with the purpose of supersonic jet noise mitigation. This spinning valve was developed at United Technologies Research Center (UTRC) [1], and its use was previously demonstrated in active control of combustion instabilities [2,3]. Extensive diagnostics deployed in the present experiments allowed a detailed analysis of the mechanism of jet noise reduction.…”

Section: Introductionmentioning

confidence: 99%

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Active Control of Noise from Hot Supersonic Jets

Sinha¹,

Towne²,

Colonius³

et al. 2018

AIAA Journal

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This paper presents diagnostic experiments aimed at understanding and mitigating supersonic jet noise from the coherent wave-packet structures that are the source of peak aft-angle mixing noise. Both isothermal and heated, nearly perfectly expanded, Mach 1.5 jets were forced in the near-nozzle region with air injection generated by a spinning-valve device designed to excite the jet at frequencies approaching those of the dominant turbulent structures. Substantial reductions in the peak aft-angle radiation were achieved with steady blowing at amplitudes corresponding to 2-6% of the mass flow rate of the primary jet. The noise benefit saturated at mass flow rates above 4%, with as much as a 6 dB reduction in overall sound pressure level at aft angles. Increasing the mass flow rates yielded a monotonically increasing high-frequency noise penalty at the sideline, where noise levels in the natural jet were already 15 dB lower than the aft-angle peak, so that the penalty due to actuation was minor. Although both steady and periodic unsteady mass injections were produced by the spinning valve when it rotated, it was calibrated to hold the steady mass flow rate constant as the frequency of unsteady blowing was changed. In this way, the effect of steady and unsteady blowings on the acoustic field could be decoupled. It is shown that the noise benefit was uniquely associated with the steady component of blowing, whereas the unsteady component resulted in additive tones in the spectra. This implied linearity is consistent with theory and experiments showing that the wave-packet structures, which give rise to the dominant aft-angle radiation, evolve in the turbulent mean flowfield in a nearly linear fashion from their origin in the near-nozzle region. The interpretation of noise reduction is that the steady component of blowing spreads the mean flow more rapidly, resulting in weaker wave packets. Periodic unsteady blowing forces coherent wave packets that are largely uncorrelated from the random natural ones, which then leads to the observed additive tones.

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Modulation of a Liquid-Fuel Jet in an Unsteady Cross-Flow

Cited by 9 publications

References 0 publications

Characterization of Confined Liquid Jet Injected into Oscillating Air Crossflow

Characterization of Confined Liquid Jet Injected into Oscillating Air Crossflow

Experimental and Numerical Characterization of a Liquid Jet Injected into Air Crossflow with Acoustic Forcing

Active Control of Noise from Hot Supersonic Jets

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