Acoustic response of an injection system to high-frequency transverse acoustic fields

Ficuciello, Antonio; Baillot, Françoise; Blaisot, Jean‐Bernard; Richard, Christine; Theron, Marié

doi:10.1177/1756827717735300

Cited by 3 publications

(1 citation statement)

References 16 publications

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“…19 In contrast, the interaction between thermo-acoustic oscillations and liquid fuel sprays has been the subject of many theoretical and experimental studies. [20][21][22][23] These investigations also include the work of Yang and Anderson 24 and Harrje and Reardon 25 on combustion instabilities in a liquid rocket engine.…”

Section: Introductionmentioning

confidence: 99%

Flame response of solid propellant AP/Al/HTPB to a longitudinal acoustic wave

Rezaiguia

Liu

Yang

2017

International Journal of Spray and Combustion Dynamics

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This paper is devoted to an experimental work which consists of the analysis of the flame of a small solid propellant sample, AP/Al/HTPB, subjected to a longitudinal acoustic wave. Experiments were conducted in a closed tube under two mean pressures: 1 and 2.5 MPa. The qualitative and quantitative analysis of the flame snapshots, using a microscope and a high-speed camera, revealed that the acoustic wave created at the end of the chamber by a pulser system strongly affects the flame and the combustion products dynamic above the solid propellant surface, namely, the flame and the hot products oscillate around a line perpendicular to the propellant surface. This dynamic of the hot gas disturbs the local burning rate and the regression surface profile. Thus, the thrust and the burning duration will change, therefore, the flight path of the rocket may shift and can lead to failure of the mission.

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Section: Introductionmentioning

confidence: 99%

Flame response of solid propellant AP/Al/HTPB to a longitudinal acoustic wave

Rezaiguia

Liu

Yang

2017

International Journal of Spray and Combustion Dynamics

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Hydrodynamic response of an annular swirling liquid sheet surrounding a forced gas jet

Sahoo

Gadgil

2022

J. Fluid Mech.

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Gas–liquid coaxial injectors invariably involve a shear layer between a fast-moving gas stream and a slow-moving liquid stream. This shear layer within the confinement of a recess has a region of absolute instability beyond a critical momentum flux ratio. This causes the spray to exhibit self-pulsation at discrete natural frequencies. We apply sinusoidal acoustic forcing to the gas jet over a range of frequencies and amplitudes to explore the frequency response of the spray. The fluctuating spray width near the injector orifice is measured as a time-resolved tracer characteristic, and its power spectral density is used to determine the spectral response of the spray. The non-pulsating spray that involves a primarily convectively unstable shear layer responds unconditionally to all the forcing frequencies. However, for a self-pulsating spray, when the forcing frequency is far from the natural frequency and both are incommensurate, the spectral response involves both the frequencies, their linear combinations and harmonics representing a state of quasi-periodicity. When the forcing frequency is close enough or the amplitude is high enough, 1 : 1 lock-in is observed where the natural mode is suppressed completely and the spray behaves just like the unforced flow with the peak shifted to the forcing frequency. Combining the experimental observations and application of the van der Pol oscillator model, we could demonstrate the analogous behaviour of this multiphase system with other hydrodynamically self-excited systems with external forcing. The results presented here can prove significant in understanding the dynamics of the atomization process in thermoacoustic coupling and possible control of it.

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Spatio-Temporal Analysis of a Self-Pulsating Gas-Centered Swirl Coaxial Injector with Forced Gas Jet

et al. 2023

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The objective of the present work is to examine the effects of the acoustically forced gas jet on self-pulsating sprays generated from a gas-centered swirl coaxial injector. We conduct the experiments on self-pulsating spray by forcing the gas jet over a range of forcing frequencies and amplitudes. Various image processing techniques, including proper orthogonal decomposition (POD), have been employed to characterize the spray response. Our spatial mapping of dominant frequencies from time-resolved spray width reveals that although both natural and forcing frequencies prevail in the primary breakup region, a modulation frequency (corresponding to the double of the beat frequency) outcompetes the others. The spatial influence of the forcing is also evaluated by measuring liquid mass fluctuations and drop size statistics at various downstream locations. The experiments were extended to investigate the role of various geometrical parameters, such as swirl number, recess, and length of the gas line on the spray response. The influence of the forcing was observed to prevail even in the liquid mass shedding zone with the appearance of all dominant frequencies. This may have important consequences on the thermoacoustic stability of the combustor. In any case, far downstream of the nozzle, the influence of acoustic forcing is not significant to alter the droplet statistics.

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Acoustic response of an injection system to high-frequency transverse acoustic fields

Cited by 3 publications

References 16 publications

Flame response of solid propellant AP/Al/HTPB to a longitudinal acoustic wave

Flame response of solid propellant AP/Al/HTPB to a longitudinal acoustic wave

Hydrodynamic response of an annular swirling liquid sheet surrounding a forced gas jet

Spatio-Temporal Analysis of a Self-Pulsating Gas-Centered Swirl Coaxial Injector with Forced Gas Jet

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