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Influence of jet-jet interactions on the lift-off length in an optical heavy-duty DI diesel engine

机译：喷气相互作用对光学重型DI柴油机升空长度的影响

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摘要

Several investigations have reported that the lift-off length on diesel jets depends strongly on the ambient temperature. The spacing between adjacent jets is thereby expected to influence the lift-off length, as it affects the amount of hot, burned gases present between the jets. Measurements on an 8-hole nozzle in an optical diesel engine showed that the lift-off length can be transient at all times between the start and end of injection. This is attributed to varying in-cylinder temperature and especially to the presence of hot combustion products in the gases entrained into the jets. The effect of inter-jet angle on lift-off length was investigated using symmetric and asymmetric nozzle cups. Decreasing the inter-jet angle produces shorter lift-off length. The lift-off length showed a weaker dependence on the ambient temperature in the engine than predicted by an empirical expression established in a constant-volume combustion vessel. These findings indicate that experiments in such vessels may not capture all features of the conditions in engines. The lift-off length tended to be 15% shorter on the downswirl (leeward) side of the jet. A strong interaction between the effects of the inter-jet spacing and the inlet temperature on the lift-off length was found. All these effects are attributed to the presence of hot gases between the jets.
机译：几项研究报告说，柴油喷气机的升空长度在很大程度上取决于环境温度。因此，预计相邻喷嘴之间的间隔会影响升起长度，因为它会影响喷嘴之间存在的热，燃烧气体的量。在光学柴油发动机的8孔喷嘴上进行的测量表明，在喷射开始和结束之间的所有时间，升程长度都是瞬态的。这归因于缸内温度的变化，尤其是归因于夹带在喷嘴中的气体中存在热燃烧产物。使用对称和不对称喷嘴杯研究了喷射角度对升起长度的影响。减小喷嘴间夹角会缩短升空长度。升程长度显示出对发动机环境温度的依赖性比恒定体积燃烧容器中建立的经验表达式所预测的弱。这些发现表明，在此类容器中进行的实验可能无法捕获发动机状况的所有特征。在射流的向下旋流（下风）侧，升起长度往往短15％。发现喷射间隔和进气温度对升空长度的影响之间有很强的相互作用。所有这些影响归因于射流之间存在热气体。

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  • 来源
    《Fuel》 |2013年第10期|311-318|共8页
  • 作者

    Clement Chartier; Ulf Aronsson; Oeivind Andersson; Rolf Egnell; Bengt Johansson;

  • 作者单位

    Division of Combustion Engines, Lund University, P.O. Box 118, SE-221 00 Lund, Sweden;

    Division of Combustion Engines, Lund University, P.O. Box 118, SE-221 00 Lund, Sweden;

    Division of Combustion Engines, Lund University, P.O. Box 118, SE-221 00 Lund, Sweden;

    Division of Combustion Engines, Lund University, P.O. Box 118, SE-221 00 Lund, Sweden;

    Division of Combustion Engines, Lund University, P.O. Box 118, SE-221 00 Lund, Sweden;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Lift-off length; Jet-jet interactions; Optical engine; Diesel; Sprays;

    机译：提离长度;喷射相互作用光学引擎;柴油机;喷雾剂;

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