...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Fuel >Effect of a cross-flow on spray impingement with port fuel injection systems for HCCI engines
【24h】

Effect of a cross-flow on spray impingement with port fuel injection systems for HCCI engines

机译：HCCI发动机用进气道燃油喷射系统产生的横流对喷雾冲击的影响

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

The use of multipoint injection systems for HCCI engines requires a mixture composition precisely controlled in order to obtain the optimum auto-ignition timing. The most favorable injection timing to achieve it is when the intake valve is open, in which case the fuel spray interacts with the air flow and impacts onto interposed surfaces where it may form a liquid film, especially at engine cold-start, and eventually generate smaller droplets by mechanisms of secondary atomization. An accurate description of the physics of spray-wall impact under cross flow conditions and of the effects of the latter on secondary atomization are key issues to devise appropriate strategies to optimize the injection system and to control mixture preparation. This is the aim of the work reported here. The experiments consider overlapping Mie and Shadowgraph visualization techniques and using a phase-Doppler interferometer to visualize and quantify the effects of a cross-flow on spray impact and secondary droplets. Furthermore, the experiments are conducted for well-defined boundary conditions, thus provide results useful for the development spray/wall interaction models. Analysis show that: the cross-flow decelerates the axial velocity of impinging droplets, thus decreasing the energy available at impact; because drag is more efficient on droplets more prone to adhere to the wall, the net effect is the formation of thinner films; this, in turn, enhances the generation of secondary drops which are then dragged away from re-impacting onto the wall.
机译：将多点喷射系统用于HCCI发动机需要精确控制混合气成分，以获得最佳的自动点火正时。最理想的喷射正时是在进气门打开时，在这种情况下，燃油喷雾与空气流相互作用并撞击到可能会形成液膜的夹层表面上，尤其是在发动机冷启动时，并最终产生通过次级雾化的机制产生较小的液滴。准确描述喷流在横流条件下的冲击物理性质及其对二次雾化的影响，是设计适当策略优化注射系统和控制混合物制备的关键问题。这就是本文报道的目的。实验考虑了重叠的Mie和Shadowgraph可视化技术，并使用相位多普勒干涉仪来可视化和量化错流对喷​​雾冲击和次级液滴的影响。此外，针对定义明确的边界条件进行了实验，从而为开发喷雾/墙体相互作用模型提供了有用的结果。分析表明：横流会降低撞击液滴的轴向速度，从而降低撞击时的可用能量。因为阻力对更易于附着在壁上的液滴更有效，所以最终效果是形成了更薄的薄膜；这反过来又增强了第二滴的生成，然后将其从重新撞击到墙上的过程中拖走。

著录项

  • 来源
    《Fuel》 |2013年第4期|249-257|共9页
  • 作者

    Miguel R. Oliveira Panao; Antonio LN. Moreira; Diamantino F.G. Durao;

  • 作者单位

    IN+, Center for Innovation, Technology and Policy Research, Institute Superior Tecnico, Technical University of Lisbon, Lisbon, Portugal;

    IN+, Center for Innovation, Technology and Policy Research, Institute Superior Tecnico, Technical University of Lisbon, Lisbon, Portugal;

    Lusiada University, Rua da Junqueira 188-198, 1349-001, Lisboa, Portugal;

  • 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

    HCCI; PFI; phase-doppler; secondary atomization;

    机译：HCCI;PFI;相位多普勒二次雾化;

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号