提高柴油发动机性能的外围燃料喷射实验研究

IF 2.2 4区 工程技术 Q2 ENGINEERING, MECHANICAL International Journal of Engine Research Pub Date : 2024-02-21 DOI:10.1177/14680874241232007
Edward F Bogdanowicz, Allen Loper, Joshua Bittle, Ajay K Agrawal
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引用次数: 0

摘要

在传统的柴油燃烧(CDC)中,位于中心的多孔喷油器向外径向供应燃料。本研究介绍并探讨了外围燃料喷射(PeFI)的概念,即使用多个单孔喷射器从燃烧室顶部的多个位置供应燃料。PeFI 概念旨在消除火焰壁和喷射壁之间的相互作用,并在理想情况下产生不受任何干扰的独立火焰。PeFI 还旨在增加近场的空气夹带,从而降低升空长度处的等效比和随后的烟尘形成。与 CDC 相比,PeFI 可减少壁面传热,但本研究并未考虑这一特点。在非反应光学室中,通过对射流的高速成像对两种燃料喷射方法进行了比较。在发动机相关环境密度为 23.0 和 18.5 公斤/立方米的条件下,将供应压力为 1500 巴的庚烷燃料注入充满氮气的试验室。试验采用了四种配置,包括一个六孔中央喷射器和六个单孔 PeFI 喷射器,喷射器的喷射孔布局角分别为 0°、15° 和 30°,布局角定义为燃料喷射中心与试验室半径之间的夹角。流动可视化显示,PeFI 在较小的布局角度下会产生喷射到喷射之间的相互作用,但当布局角度增加到 30° 时,几乎不会产生喷射到喷射之间(或喷射到喷射壁之间)的干扰。图像分析显示,与中央喷射器相比,PeFI 的喷射速度更快、喷射穿透长度更长、喷射顶端附近的宽度更大、喷射体积更大。总之,结果表明 PeFI 具有同时提高柴油发动机燃油效率和减少排放的潜力。
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Experimental study of peripheral fuel injection for higher performance in diesel engines
In conventional diesel combustion (CDC), a centrally located multi-hole injector supplies fuel radially outwards. This study introduces and explores the concept of peripheral fuel injection (PeFI) to supply fuel from multiple locations on top of the combustion chamber using several single-hole injectors. The PeFI concept is designed to eliminate flame-wall and jet-wall interactions, and, ideally, to produce independent flames without any interference. PeFI is also intended to increase air entrainment in the near field and thus, reduce equivalence ratio at the lift-off length and subsequent soot formation. PeFI reduces wall heat transfer compared to CDC although this feature is not considered in the present study. The two methods of fuel injection are compared in a non-reacting optical chamber via high-speed imaging of the jets. N-heptane fuel at 1500 bar supply pressures is injected into a test chamber filled with nitrogen at engine relevant ambient densities of 23.0 and 18.5 kg/m3. Four configurations are trialed including a six-hole central injector and six, single-hole PeFI injectors with holes oriented at a layout angle, defined as the angle between the center of the fuel jet and chamber radius, of 0°, 15°, and 30°. Flow visualizations show jet-to-jet interactions at small layout angles for PeFI, but little to no jet-to-jet (or jet-wall) interference as the layout angle increases to 30°. Image analysis reveals that PeFI provides faster rate of injection, longer jet penetration length, greater width near the jet tip, and larger jet volume compared to those for the central injector. Overall, results demonstrate the potential of PeFI to simultaneously improve fuel efficiency and reduce emissions in diesel engines.
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来源期刊
International Journal of Engine Research
International Journal of Engine Research 工程技术-工程:机械
CiteScore
6.50
自引率
16.00%
发文量
130
审稿时长
>12 weeks
期刊介绍: The International Journal of Engine Research publishes high quality papers on experimental and analytical studies of engine technology.
期刊最新文献
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