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Study on the Ignition, Combustion and Emissions of HCCI Combustion Engines Fueled With Primary Reference Fuels
Technical Paper
2005-01-0155
ISSN: 0148-7191, e-ISSN: 2688-3627
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English
Abstract
This article investigates the basic combustion parameters including start of ignition, combustion duration, and CO, UHC, and NOx emissions of HCCI combustion engines fueled with primary reference fuels and their mixtures. A single-cylinder HCCI combustion engine, which was converted from a four-cylinder high-speed diesel engine, was used to the tests. Two primary reference fuels, n-heptane and iso-octane, and their mixtures including RON25, RON50, RON75, and RON90 were evaluated. In addition, the effects of cooled EGR on the HCCI combustion and emissions were also studied.
The experimental results shown that, in the first-stage combustion, with the increase of the research octane number, the start of ignition retards, the combustion duration shortens, and the pressure rising and the temperature rising during the first-stage combustion decrease. Furthermore, the cumulative heat release in the first stage is strongly dependent on the concentration of n-heptane in the mixtures. The start of ignition of the second-stage combustion is linear with the start of the ignition of the fist stage. The combustion duration of the second stage decreases with the increase of the equivalence ratio and the decrease of the research octane number.
The EGR tests indicated that the combustion phasing of the first-stage and second-stage combustion retard, and the combustion duration prolongs with the introduction of cooled EGR. At the same time, a higher EGR rate can be tolerated for the HCCI combustion using a high cetane number fuels, such as n-heptane and RON25, but only 45% EGR rate for RON75 at 1800r/min. Furthermore, there is a moderate effect of EGR rate on CO and UHC emissions for HCCI engines fueled with n-heptane and RON25, but a distinct effect on emissions for higher octane number fuels
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Authors
- Xing-cai Lü - School of Mechanical & Power Engineering, Shanghai Jiaotong University
- Wei Chen - School of Mechanical & Power Engineering, Shanghai Jiaotong University
- Yu-chun Hou - School of Mechanical & Power Engineering, Shanghai Jiaotong University
- Zhen Huang - School of Mechanical & Power Engineering, Shanghai Jiaotong University
Topic
Citation
Lü, X., Chen, W., Hou, Y., and Huang, Z., "Study on the Ignition, Combustion and Emissions of HCCI Combustion Engines Fueled With Primary Reference Fuels," SAE Technical Paper 2005-01-0155, 2005, https://doi.org/10.4271/2005-01-0155.Also In
Homogeneous Charge Compression Ignition (HCCI) Combustion 2005
Number: SP-1963; Published: 2005-04-11
Number: SP-1963; Published: 2005-04-11
Homogeneous Charge Compression Ignition (HCCI) Combustion on CD-ROM from the SAE 2005 World Congress
Number: SP-1982CD; Published: 2005-04-11
Number: SP-1982CD; Published: 2005-04-11
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