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Atomization and Sprays

Publication de 12  numéros par an

ISSN Imprimer: 1044-5110

ISSN En ligne: 1936-2684

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Indexed in

TRANSIENT MULTIDIMENSIONAL MODELING OF AIR-BLAST ATOMIZERS

Volume 13, Numéro 4, 2003, pp. 373-394
DOI: 10.1615/AtomizSpr.v13.i4.30
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RÉSUMÉ

A group of models for representing air-blast atomization were tested together and compared to experimental data. A primary atomization model, known as the linearized instability sheet atomization (LISA) model, which was designed and validated for pressure-swirl atomization, has now been extended to air-blast atomizers. That model, presented and tested by Schmidt et al. [1], has been slightly modified in light of recent discoveries. Existing models for secondary breakup, droplet collision, and turbulent dispersion were used. None of these models was adjusted for better results, but they were instead tested for their predictive ability. The calculations were validated with two gas-turbine airblast atomizers. The models were first applied to an injector typical of those used in small gas-turbine engines, for which both light-diffraction droplet-size distribution data and fuel flux distribution data were measured. Subsequently, the model was applied to simulate the flow from a fuel injector typical of those used in mid-thrust engines. In this case, laser velocimetry data were available for the gas phase, as well as drop size and mass flux data for the liquid phase. The laser velocimetry data provided a means to determine whether the underlying gas flow field was computed correctly, which is essential for modeling the spray accurately. Sensitivity to inputs and convergence criteria were also investigated. The agreement of the spray predictions with the experimental data was encouraging, which suggests that these models have general applicability for atomization. However, the results also indicate areas where the gas-phase calculation and spray models are lacking.

CITÉ PAR
  1. Frain Matt, Schmidt David P., Pan Yong-Le, Chang Richard K., Selective Deflection and Localization of Flowing Aerosols onto a Substrate, Aerosol Science and Technology, 40, 3, 2006. Crossref

  2. Ibrahim A.A., Jog M.A., Nonlinear instability of an annular liquid sheet exposed to gas flow, International Journal of Multiphase Flow, 34, 7, 2008. Crossref

  3. Mostafa Abdu, Characteristics of Sprays Produced by a High Shear Atomizer, 40th AIAA/ASME/SAE/ASEE Joint Propulsion Conference and Exhibit, 2004. Crossref

  4. Tharakan T. John, Mukhopadhyay Achintya, Datta Amitava, Jog Milind A., Trends in Comprehensive Modeling of Spray Formation, International Journal of Spray and Combustion Dynamics, 5, 2, 2013. Crossref

  5. Yan Kai, Jog Milind A., Ning Zhi, Nonlinear spatial instability of an annular swirling viscous liquid sheet, Acta Mechanica, 224, 12, 2013. Crossref

  6. Irannejad Abolfazl, Jaberi Farhad, Large eddy simulation of turbulent spray breakup and evaporation, International Journal of Multiphase Flow, 61, 2014. Crossref

  7. Chatterjee Souvick, Mukhopadhyay Achintya, Sen Swarnendu, A Comprehensive Model for Estimation of Spray Characteristics, in Droplets and Sprays, 2018. Crossref

  8. Apte S. V., Moin P., Spray Modeling and Predictive Simulations in Realistic Gas-Turbine Engines, in Handbook of Atomization and Sprays, 2011. Crossref

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