Abstract
Entropy image analysis of primary atomization for a coaxial airwater jet submitted to acoustics at variable ambient pressure.
Highlights
Thermoacoustic instabilities in liquid rocket engines represent a big challenge to overcome in new rocket design
The present works aim to analyse the influence of the gas density on a coaxial jet water/air atomization submitted to acoustics
It can be seen on this figure that as qualitatively observed, the variation of the ambient pressure P does nearly not affect the jet expansion or the primary atomization area, confirming that the atomization is mainly controlled by Rel and Weg values
Summary
Thermoacoustic instabilities in liquid rocket engines represent a big challenge to overcome in new rocket design. The actual approach covers a large range of two phase flows regimes, going from low Weber number (Rayleigh regime) up to high Weber number (fiber regime) adding the effect of the ambient gas pressure. To perform this experimental study, an original acoustic cavity (MARACA: Moderate Ambient pRessure Acoustic Chamber) was developed at CORIA lab. Characterization of cylindrical liquid jets flattening and deviation as well as of single droplets deviation was studied by [2] and [4] They implemented a description of the modification of the whole spray assembly by the acoustics by means of statistical methods showing droplets clustering in the acoustic field.
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