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雾化与喷雾

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ISSN 打印: 1044-5110

ISSN 在线: 1936-2684

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EMBEDDED DNS CONCEPT FOR SIMULATING THE PRIMARY BREAKUP OF AN AIRBLAST ATOMIZER

卷 26, 册 3, 2016, pp. 187-215
DOI: 10.1615/AtomizSpr.2014011019
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摘要

The primary breakup represents the initial step of the liquid atomization process and is still not well understood. Prefilming airblast atomizers are utilized in aircraft engines to atomize the liquid fuel. The geometries of airblast atomizers are complex; the operating conditions are characterized by high Reynolds and Weber numbers. The investigation of airblasted sheets lack experimental data due to the limited accessibility of the prefilmer geometry. Numerical experiments represent an alternative. This paper introduces the embedded direct numerical simulation (DNS) concept that aims to fill this gap. The concept consists of three steps: a geometry simplification, the generation of inflow boundary conditions for the embedded domain, and the two-phase flow DNS of the breakup region. The annular airblast atomizer geometry is simplified to a planar configuration. A zonal large eddy simulation of the turbulent channel flow is performed prior to the DNS. The inflow paramters are mapped to the inlet of the embedded domain. The results from the turbulent channel flow computations illustrate a good agreement with DNS data. The primary breakup of an airblasted sheet is simulated by using the volume-of-fluid method. Two different grid resolutions are utilized. Qualitative studies show a good agreement of the liquid deformations and the dominant primary atomization mechanism with experimental results. Quantitative results discuss the resulting droplet distributions, the grid resolutions related to the representation of small structures and turbulence, and the breakup length and time scales. It is confirmed that the fine grid improves the resolution of small droplets due to the further breakup of already separated structures. The majority of the liquid mass instead is associated with the irregular appearing large scales, which are already resolved using the coarse grid. This paper proves the applicability of the embedded DNS approach for understanding the primary breakup of prefilming airblast atomizers.

对本文的引用
  1. Warncke K., Gepperth S., Sauer B., Sadiki A., Janicka J., Koch R., Bauer H.-J., Experimental and numerical investigation of the primary breakup of an airblasted liquid sheet, International Journal of Multiphase Flow, 91, 2017. Crossref

  2. Braun Samuel, Wieth Lars, Holz Simon, Dauch Thilo F., Keller Marc C., Chaussonnet Geoffroy, Gepperth Sebastian, Koch Rainer, Bauer Hans-Jörg, Numerical prediction of air-assisted primary atomization using Smoothed Particle Hydrodynamics, International Journal of Multiphase Flow, 114, 2019. Crossref

  3. Driscoll James F., Chen Jacqueline H., Skiba Aaron W., Carter Campbell D., Hawkes Evatt R., Wang Haiou, Premixed flames subjected to extreme turbulence: Some questions and recent answers, Progress in Energy and Combustion Science, 76, 2020. Crossref

  4. Giusti A., Mastorakos E., Turbulent Combustion Modelling and Experiments: Recent Trends and Developments, Flow, Turbulence and Combustion, 103, 4, 2019. Crossref

  5. Dauch T. F., Chaussonnet G., Keller M. C., Okraschevski M., Ates C., Koch R., Bauer H.-J., 3D Predictions of the Primary Breakup of Fuel in Spray Nozzles for Aero Engines, in High Performance Computing in Science and Engineering '20, 2021. Crossref

  6. Asuri Mukundan Anirudh, Ménard Thibaut, Brändle de Motta Jorge César, Berlemont Alain, Detailed numerical simulations of primary atomization of airblasted liquid sheet, International Journal of Multiphase Flow, 147, 2022. Crossref

  7. Palanti L., Puggelli S., Langone L., Andreini A., Reveillon J., Duret B., Demoulin F.X., An attempt to predict spray characteristics at early stage of the atomization process by using surface density and curvature distribution, International Journal of Multiphase Flow, 147, 2022. Crossref

  8. An Xiang, Dong Bo, Zhang Yajin, Wang Yong, Zhou Xun, Li Weizhong, Influence of the wettability on the liquid breakup in planar prefilming airblast atomization using a coupled lattice Boltzmann–large eddy simulation model, Physics of Fluids, 34, 5, 2022. Crossref

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