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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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Indexed in

VAPORIZATION EFFECTS ON TRANSIENT DIESEL SPRAY STRUCTURE

卷 21, 册 5, 2011, pp. 411-426
DOI: 10.1615/AtomizSpr.2011003785
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摘要

This paper examines how the penetration, spreading rate, and entrainment of a vaporizing spray differ from those of a nonvaporizing spray under diesel engine operating conditions, when the injected mass and momentum flow rates are the same for both. Correlations for these parameters derived for nonvaporizing sprays from measurements in a constant-volume chamber are often employed to explain the behavior of vaporizing sprays in diesel engines. In fact, they appear to explain results rather well. Furthermore, vapor jets injected with the same mass and momentum flow rates as the vaporizing sprays have been shown to give penetration and spreading rates which are comparable to those of the sprays, although the latent heat of vaporization has not been included in specifying the internal energy of the vapor. Why? These questions are addressed by carrying out computations in a constant-volume chamber for the Sandia baseline n-heptane spray (http://www.ca.sandia.gov/ecn). This spray has been the subject of a prior study by the authors. Details of vaporizing and nonvaporizing sprays, and corresponding vapor jets, are examined in order to provide insight into the physics whose effects are ultimately reflected in the global parameters such as penetration and spreading. The role that vaporization plays in determining these parameters is a focus of the paper. The influence of drop size and ambient conditions on the conclusions is critically evaluated. The interplay of changes in temperature and density in the core of the spray with momentum exchange and entrainment is discussed as part of the explanation of the observed results.

对本文的引用
  1. Bajaj Chetan, Ameen Muhsin, Abraham John, Evaluation of an Unsteady Flamelet Progress Variable Model for Autoignition and Flame Lift-Off in Diesel Jets, Combustion Science and Technology, 185, 3, 2013. Crossref

  2. Bhattacharjee Subhasish, Haworth Daniel C., Simulations of transient n-heptane and n-dodecane spray flames under engine-relevant conditions using a transported PDF method, Combustion and Flame, 160, 10, 2013. Crossref

  3. Yen May, Abraham John, Computations of Soot and NO in Lifted Flames under Diesel Conditions, SAE Technical Paper Series, 1, 2014. Crossref

  4. Ameen Muhsin M., Abraham John, RANS and LES Study of Lift-Off Physics in Reacting Diesel Jets, SAE Technical Paper Series, 1, 2014. Crossref

  5. Cai Gary, Abraham John, Multidimensional simulations of non-reacting and reacting diesel and biodiesel sprays, Energy, 119, 2017. Crossref

  6. Abraham John, Critical observations on the modeling of nonreacting and reacting diesel sprays, Proceedings of the Institution of Mechanical Engineers, Part D: Journal of Automobile Engineering, 229, 11, 2015. Crossref

  7. Sphicas Panos, Pickett Lyle M, Skeen Scott A, Frank Jonathan H, Inter-plume aerodynamics for gasoline spray collapse, International Journal of Engine Research, 19, 10, 2018. Crossref

  8. Bruneaux Gilles, Causse Mickael, Omrane Alaa, Air Entrainment in Diesel-Like Gas Jet by Simultaneous Flow Velocity and Fuel Concentration Measurements, Comparison of Free and Wall Impinging Jet Configurations, SAE International Journal of Engines, 5, 2, 2011. Crossref

  9. Salehi Fatemeh, Ghiji Mohammadmahdi, Chen Longfei, Large eddy simulation of high pressure spray with the focus on injection pressure, International Journal of Heat and Fluid Flow, 82, 2020. Crossref

  10. Hinrichs Jörn, Shastry Varun, Junk Malte, Hemberger Yasmin, Pitsch Heinz, An experimental and computational study on multicomponent evaporation of diesel fuel droplets, Fuel, 275, 2020. Crossref

  11. Wang Huaiyu, Gan Huibing, Theotokatos Gerasimos, Parametric investigation of pre-injection on the combustion, knocking and emissions behaviour of a large marine four-stroke dual-fuel engine, Fuel, 281, 2020. Crossref

  12. Jebakumar Anand Samuel, Abraham John, Comparison of the structure of computed and measured particle-laden jets for a wide range of Stokes numbers, International Journal of Heat and Mass Transfer, 97, 2016. Crossref

  13. Liu Jie, Guo Qiang, Guo Jiayong, Wang Fan, Optimization of a diesel/natural gas dual fuel engine under different diesel substitution ratios, Fuel, 305, 2021. Crossref

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