A Parametric Study of Low-Temperature, Late-Injection Combustion in a HSDI Diesel Engine(<Special Issue>Advanced Combustion Technology in Internal Combustion Engines)

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概要

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• A parametric study of automotive diesel combustion in a low-temperature, late-injection combustion regime is described. Injection pressure was varied from 600-1200 bar, swirl ratio from 1.44-7.12, and intake temperature from 30-110℃. In-cylinder pressure records, heat release analysis, spatially-integrated soot luminosity, and images of the spatial distribution of combustion luminosity are employed to study the influence of these parameters on the combustion and soot formation/oxidation processes. Load points of 3 and 6 bar gross IMEP at 1500 RPM and an O_2 concentration of 0.15 are considered. Increased injection pressure is found to enhance the early mixture formation process, resulting in increased peak apparent heat release, generally decreased soot luminosity, and modestly increased light-load soot oxidation rates. At lower injection pressures, more soot luminosity is observed from the squish volume. In contrast, variation of flow swirl impacts the latter half of the combustion process, and affects the initial combustion only slightly. An optimum Ricardo swirl ratio of roughly 3 is found for best moderate-load efficiency and soot oxidation. A marked reduction in early heat release rates and peak soot luminosity is observed with decreased intake temperature. Nevertheless, significant in-cylinder soot luminosity is observed even at the lowest intake temperatures, indicating that complete suppression of in-cylinder soot formation is difficult with the fuel injection and combustion system characteristics employed.

• 一般社団法人日本機械学会の論文
• 2005-11-15

著者

• Choi Dae

  Sandia Lab

• Choi Dae

  Sandia National Laboratories-combustion Research Facility

• MILES Paul

  Sandia National Laboratories-Combustion Research Facility

• YUN Hanho

  Delphi Research Labs

• REITZ Rolf

  University of Wisconsin-Engine Research Center

• Miles Paul

  Sandia National Laboratories

関連論文

• 1737 直噴式ディーゼル機関における混合気形成過程に及ぼす燃料液滴挙動の解析
• A Parametric Study of Low-Temperature, Late-Injection Combustion in a HSDI Diesel Engine(Advanced Combustion Technology in Internal Combustion Engines)
• A Parametric Study of Low-Temperature, Late-Injection Combustion in an HSDI Diesel Engine(Diesel Engines, Performance and Emissions, Thermal Efficiency)
• (3-28) Measurement and Modeling of Large-Scale Flow Structures and Turbulence in a High-Speed Direct-Injection Diesel Engine((DE-5)Diesel Engine Combustion 5-Heat Transfer and Fluid Flow)
• MD3-3: Distribution of Unburned Hydrocarbons for Low Temperature Light-Duty Diesel Combustion(MD: Measurement and Diagnostics,General Session Papers)
• MS3-2: Comparison of Measured and Simulated In-Cylinder Flow Fields in an Optical Diesel Engine(MS: Modeling and Simulation,General Session Papers)

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