Published 12 issues per year
ISSN Print: 1044-5110
ISSN Online: 1936-2684
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DIESEL SPRAY CFD SIMULATIONS BASED ON THE Σ-Υ EULERIAN ATOMIZATION MODEL
ABSTRACT
This work presents an implementation and evaluation of the Σ-Υ atomization model for Diesel spray CFD simulations. The Σ-Υ model is based on an Eulerian representation of the spray atomization and dispersion by means of a single-fluid variable density turbulent flow within a RANS framework. The locally homogeneous flow approach has been applied in order to develop a spray vaporization model based on state relationships. A finite-volume solver for model equations has been created using the OpenFOAM CFD open-source C++ library. Model predictions have been compared to experimental data from free Diesel sprays under nonvaporizing and vaporizing conditions. High-speed imaging, PDPA, and Rayleigh-scattering measurements have been used in order to assess the CFD model. Accurate predictions of liquid and vapor spray penetration, as well as axial velocity and mixture fraction profiles, can be simultaneously achieved for a wide range of injection pressure and ambient conditions, despite only having qualitatively correct predictions of droplet size. The success of these predictions supports the mixing-limited vaporization hypothesis. Model accuracy is better for high ambient density and injection pressure conditions. It is proposed that under low ambient density and injection pressure conditions, interfacial dynamics become more important and the single velocity field assumption is less appropriate.
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Xue Qingluan, Battistoni Michele, Som Sibendu, Quan Shaoping, Senecal P. K., Pomraning Eric, Schmidt David, Eulerian CFD Modeling of Coupled Nozzle Flow and Spray with Validation Against X-Ray Radiography Data, SAE International Journal of Engines, 7, 2, 2014. Crossref
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Battistoni Michele, Xue Qingluan, Som Sibendu, Pomraning Eric, Effect of Off-Axis Needle Motion on Internal Nozzle and Near Exit Flow in a Multi-Hole Diesel Injector, SAE International Journal of Fuels and Lubricants, 7, 1, 2014. Crossref
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Pandal A., Payri R., García-Oliver J.M., Pastor J.M., Optimization of spray break-up CFD simulations by combining Σ-Y Eulerian atomization model with a response surface methodology under diesel engine-like conditions (ECN Spray A), Computers & Fluids, 156, 2017. Crossref
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