Communication Dans Un Congrès Année : 2025

Addressing the transcritical spray injection through experimental velocity measurements and numerical simulations

Résumé

The transition between subcritical two-phase atomization and supercritical single-phase mixing is still poorly understood: so far, there exists no consensus in the literature on its governing mechanisms and key parameters. Indeed, high-pressure complexifies considerably the physics of liquid injection, particularly when exceeding the thermodynamical critical point, as the distinction between the liquid and the gas states becomes much less straightforward. These phenomena are all the more complicated when studying multispecies cases. Moreover, building a fully controlled set-up able to achieve and maintain high-pressure and high-temperature conditions while collecting data within such extreme conditions remains highly challenging, which induces a lack of quantitative experimental results in the literature. To reduce this gap, Image Correlation Velocimetry (ICV) is applied to a realistic set-up, a shear coaxial injector (similar to a liquid rocket engine injector) evolving at sub-, trans-and supercritical conditions. The injection consists of an ethane inner jet assisted by a gaseous nitrogen annular flow. Ambient pressure, ambient and outer temperature, inner jet mass flowrate and momentum flux ratio are systematically varied. Time-averaged velocity fields and profiles are obtained for a large set of experimental cases (420). Results show important velocity variations and a clear dependence on pressure and temperature, which might be explained by transcritical effects. Some limits of the velocimetry method are underlined and accounted for an appropriate analysis. Finally, Large-Eddy Simulations are run with the compressible CFD code SiTCom-B for the supercritical case to assess the modelling strategy.

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hal-05263416 , version 1 (16-09-2025)

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  • HAL Id : hal-05263416 , version 1

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Téodor Chazelle, Florian Lespinasse, Said Idlahcen, Jean-Bernard Blaisot, Benoît Barviau, et al.. Addressing the transcritical spray injection through experimental velocity measurements and numerical simulations. 33rd Conference on Liquid Atomization and Sprays (ILASS 2025), ILASS-Europe, Aug 2025, Lund, Sweden. ⟨hal-05263416⟩
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