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首页> 外文期刊>Fuel >Optical diagnostics on the effects of fuel properties and coolant temperatures on combustion characteristic and flame development progress from HCCI to CDC via PPC
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Optical diagnostics on the effects of fuel properties and coolant temperatures on combustion characteristic and flame development progress from HCCI to CDC via PPC

机译：光学诊断对燃料特性和冷却剂温度对通过PPC到CDC的燃烧特性和火焰显影进展的影响

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摘要

The effects of fuel properties and coolant temperatures on combustion characteristic and flame development progress were investigated in an optical engine. The combustion mode was transited from homogeneous charge compression ignition (HCCI) to conventional diesel combustion (CDC) via partially premixed combustion (PPC) by changing the start of injection (SOI) timings from early to late injections. The main fuel properties were separated by using diesel, n-heptane, iso-octane, n-butanol and their mixtures. Diagnostics included conventional in-cylinder pressure and heat-release analysis, high-speed imaging and the spatially integrated flame luminosity intensity. The results show that the variation of combustion phasing (CA50) is more sensitive to the variation of fuel properties of cetane number, latent heat and atomic oxygen at all tested combustion modes. However, fuel physical properties such as dilution, viscosity and volatility only have significant effects at HCCI, while minor effects at PPC and CDC. Fuel properties have minor effects on flame development progress, but significant effects on maximum value of natural flame luminosity intensity. At SOI-15, the main factor to reduce the maximum value of natural flame luminosity intensity is the dilution, viscosity and volatility (40%) followed by the latent heat and the atomic oxygen (18.5%) and cetane number (1.6%). At SOI-5, the main factor is the cetane number (44.1%) followed by the latent heat and the atomic oxygen (36.2%) and dilution, viscosity and volatility (2.4%). Coolant temperature significantly influences combustion phasing and peak in-cylinder pressure and heat release rate at early injection timings, but these effects weaken at late injection timings.
机译：在光学发动机中研究了燃料特性和冷却剂温度对燃烧特性和火焰显影进展的影响。通过从早期从早期注射到晚期注射的注射开始（SOI）定时通过部分预混合的燃烧（PPC）从均匀电荷压缩点火（HCCI）转变为常规柴油燃烧（CDC）。通过使用柴油，正庚烷，异辛烷，正丁醇及其混合物来分离主要燃料。诊断包括常规的缸内压力和热释放分析，高速成像和空间集成的火焰亮度强度。结果表明，燃烧相位（CA50）的变化对所有测试的燃烧模式的十六烷数，潜热和原子氧的燃料特性的变化更敏感。然而，诸如稀释，粘度和挥发性的燃料物理性质仅对HCCI具有显着影响，而PPC和CDC的次要影响。燃料特性对火焰开发进展具有轻微影响，对天然火焰亮度强度的最大值影响显着。在SOI-15中，降低天然火焰亮度强度的最大值的主要因素是稀释，粘度和挥发性（40％），然后是潜热和原子氧（18.5％）和十六烷数（1.6％）。在SOI-5，主要因素是十六烷值（44.1％），然后是潜热和原子氧（36.2％）和稀释，粘度和挥发性（2.4％）。冷却剂温度显着影响燃烧阶段和汽缸峰值压力和早期注射时机的热释放速率，但在晚期注射时间内这些效果削弱。

著录项

  • 来源
    《Fuel》 |2020年第1期|117441.1-117441.19|共19页
  • 作者

    Cui Yanqing; Liu Haifeng; Geng Chao; Tang Qinglong; Feng Lei; Wang Yu; Yi Wentao; Zheng Zunqing; Yao Mingfa;

  • 作者单位

    Tianjin Univ State Key Lab Engines Tianjin 300072 Peoples R China;

    Tianjin Univ State Key Lab Engines Tianjin 300072 Peoples R China;

    Tianjin Univ State Key Lab Engines Tianjin 300072 Peoples R China;

    King Abdullah Univ Sci & Technol Clean Combust Res Ctr Thuwal 239556900 Saudi Arabia;

    Tianjin Univ State Key Lab Engines Tianjin 300072 Peoples R China;

    Tianjin Univ State Key Lab Engines Tianjin 300072 Peoples R China;

    Tianjin Univ State Key Lab Engines Tianjin 300072 Peoples R China;

    Tianjin Univ State Key Lab Engines Tianjin 300072 Peoples R China;

    Tianjin Univ State Key Lab Engines Tianjin 300072 Peoples R China;

  • 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

    Fuel properties; Coolant temperatures; Different combustion modes; Optical diagnostic;

    机译：燃料特性;冷却剂温度;不同的燃烧模式;光学诊断;

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