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Rupture de jet

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Atomisation

Principes - modélisation

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Pressure-Swirl Atomization in the Near Field

David P. Schmidt, Idriss Nouar, P. K. Senecal, Jeff Hoffman, C. J. Rutland, J. Martin, R. D. Reitz

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On spray formation

By P. MARMOTTANT AND E. VILLERMAUX

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Atomisateurs & Pulvériateurs

• Pressure Jet Atomization

• Pressure-Swirl Atomization

• Two-Fluid Atomization

• Fan Spray Atomization

• Rotary Atomization

• Effervescent Atomization

• Electrostatic Atomization

• Vibration Atomization

• Whistle Atomization

Injecteurs « classiques » Injecteurs « assistés-air»

Pulvérisateurs industriels (peinture..)

Injecteurs « pré-mélange »

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Formation de gouttes

(a) Liquid dripping – Goutte à goutte

(b) Liquid column/jet breakup – Rupture de jet

(c) Liquid ligament breakup – Rupture de ligament

(d) Liquid sheet/film breakup – Rupture de nappe

(e) Liquid free-surface breakup – Arrachement de surface libre

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Rupture de jet

• Rayleigh (non visqueux)

• Weber (visqueux)

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(a) Je < 0.1: Goutte à goutte

(b) Je ≈ 0.1–10: Rupture en gouttes par oscillations longitudinales

(c) Je ≈ 10–500: Rupture par oscillation latérales et frottement aérodynamique

(d) Je > 500: Rupture par formation de membranes ou ligaments

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ts

Nappes coniques :

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Liu and Reitz, 1993

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Liu

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: Équilibre de la goutte sans effets visqueux

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Rupture de jet

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Rupture de cône (swirl atom.)

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Assistance air

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dms

dms dms

dms

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Ref.

SCIENCE AND ENGINEERING OFDROPLETS, Fundamentals and Applications, Huimin Liu, NOYES PUBLICATIONS

Internal Combustion Engines Fundamentals, D. Heywood, Mc Graw- Hill

Reitz, R. D., Atomization and Other Breakup Regimes of a Liquid Jet, Ph.D. Thesis, Princeton University, Princeton, NJ, USA, September (1978)

A NEW MODEL FOR CAVITATION INDUCED PRIMARY BREAK-UP OF DIESEL SPRAYS, C. Baumgarten, J. Stegemann and G. P.

Merker, ILASS-2002

On spray formation, P. MARMOTTANT, E. VILLERMAUX, J. Fluid Mech. (2004), vol. 498, pp. 73–111

Pressure-Swirl Atomization in the Near Field, David P. Schmidt, Idriss Nouar, P. K. Senecal, Jeff Hoffman, C. J. Rutland, Jay

Martin, R. D. Reitz, SAE 99

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