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Atomization and Sprays
Fator do impacto: 1.262 FI de cinco anos: 1.518 SJR: 0.814 SNIP: 1.18 CiteScore™: 1.6

ISSN Imprimir: 1044-5110
ISSN On-line: 1936-2684

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Atomization and Sprays

DOI: 10.1615/AtomizSpr.v19.i7.10
pages 597-619

COMPREHENSIVE COLLISION MODEL FOR MULTIDIMENSIONAL ENGINE SPRAY COMPUTATIONS

Achuth Munnannur
Cummins Emission Solutions, Stoughton, Wisconsin 53589, USA
Rolf D. Reitz
Engine Research Center, University of Wisconsin-Madison, Rm 1018A, 1500 Engineering Drive, Madison, Wisconsin 53706, USA

RESUMO

A new collision model with improved physical accuracy and reduced numerical dependency has been developed and is used for engine spray calculations. A radius-of-influence of collisional interaction approach was employed along with dynamic discrete particle resolution improvement to reduce numerical dependency. The collision outcomes considered include bounce, coalescence, and fragmenting and nonfragmenting separation processes. The improved collision probability and outcome predictions were coupled to form a comprehensive model that was used to simulate nonvaporizing diesel sprays produced under conditions relevant to common-rail diesel injection systems. Spray penetration results from visualization studies, and drop-size and velocity data from phase Doppler particle analyzer measurements were used to assess the capability of the model for different injection pressures and various chamber densities. The predictions were reasonably good, indicating that the present improvements to collision modeling have increased the fidelity of spray modeling predictions, and are consequently expected to help improve the accuracy of multiphase flow simulations.


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