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Atomization and Sprays
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ISSN Imprimir: 1044-5110
ISSN En Línea: 1936-2684

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Atomization and Sprays

DOI: 10.1615/AtomizSpr.v7.i6.20
pages 581-601

APPLICATION OF THE RNG k-ε MODEL TO THE ANALYSIS OF FLOWS AND SPRAY CHARACTERISTICS

Hei Cheon Yang
Faculty of Mechanical and Automotive Engineering, Yosu National University, 195 Kuk-Dong, Yosu, Chonnam, 150-749, Korea
Hong Sun Ryou
School of Mechanical Engineering, Chung-Ang University, Chung-Ang University 221, HeukSuk Dong, DongJak Ku, Seoul, 156-756, Korea
K. B. Hong
Department of Mechanical Engineering, Aju University, Suwon, Korea
H. S. Kim
Department of Mechanical Engineering, Aju University, Suwon, Korea
Sang Kyoo Park
Faculty of Mechanical and Automotive Engineering, Yosu National University, 195 Kuk-Dong, Yosu, Chonnam, 150-749, Korea

SINOPSIS

This article studies the applicability of the renormalization group (RNG) k-ε model to analysis of flows with spray characteristics. Predicted results using the (RNG) k-ε model of three complex flows, i.e., flow over a backward-facing step and over a blunt flat plate, and flow around a semi-3D model car, are compared with those from the standard k-ε model and experimental data. The results of the spray characteristics in the chamber of a direct-injection model engine are compared with those from the modified k-ε model and experimental data. The results of reattachment length, separated eddy size, and average surface pressure distribution using the RNG k-ε model show more reasonable trends compared with the experimental data than results using the k-ε model. The eddy viscosity predicted using the modified k-ε model in the spray region is significantly larger than that using the RNG k-ε model. Spray tip penetration predicted using the RNG k-ε model is closer to the experimental data than that using the modified k-ε model. The application of the RNG k-ε model seems to have some potential for simulations of spray characteristics, e.g., spray tip penetration, spray tip velocity, and droplet distribution, over the modified k-ε model.


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