| Project/Area Number |
15560179
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Thermal engineering
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| Research Institution | Nagoya Institute of Technology |
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Principal Investigator |
OHTA Yasuhiko Nagoya Institute of Technology, Graduate School of Engineering, Department of Engineering Physics, Electronics and Mechanics, Professor (90024273)
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| Co-Investigator(Kenkyū-buntansha) |
FURUTANI Masahiro Nagoya Institute of Technology, Graduate School of Engineering, Department of Engineering Physics, Electronics and Mechanics, Assistant Professor (50242904)
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| Project Period (FY) |
2003 – 2004
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| Project Status |
Completed (Fiscal Year 2004)
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| Budget Amount *help |
¥3,500,000 (Direct Cost: ¥3,500,000)
Fiscal Year 2004: ¥1,200,000 (Direct Cost: ¥1,200,000)
Fiscal Year 2003: ¥2,300,000 (Direct Cost: ¥2,300,000)
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| Keywords | Internal Combustion Engine / Spontaneous Ignition / Cool Flame / Formaldehyde / Negative Temperature Coefficient Regime / Temperature Measurement / Gas Analysis / Octane Rating / 予混合圧縮自着火 / 着火抑制 / 着火促進 / 添加剤 |
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| Research Abstract |
The low-temperature-ignition classification ; three typical regime, "cool-flame dominant regime, "negative-temperature-coefficient regime" and "blue-flame dominant regime" would be a universal advanced/retarded criterion on ignition of fuel/air mixtures with formaldehyde doping for the ignition timing control in the premixed-compression-ignition engines. The formaldehyde would be a suppressing additive under the cool-flame generating constituents, temperature and pressure conditions, and a promoting additive under the poor cool-flame generating conditions in the cylinder charge during the preflame reactions leading to the ignition. The added formaldehyde is superfluous to the ignition event originally belonging to the cool-flame dominant regime, which would give a suppressing effect. On the other hand, the artificially added formaldehyde could be a starting point of preflame reactions leading to the final hot ignition belonging to the blue-flame-dominant regime, where a few fuel transition and low intermediates appear, and where the high temperature chemistry dominates. It allows a short cut of the preflame induction period, in consequence, a promoting effect for the ignition.
A glow-plug assisted procedure is examined for the cold start of the natural-gas premixed-compression-ignition engine engines. A glow plug installation and formaldehyde addition will raise the load mixture temperature, which will result in the higher local temperature of compressed mixture. Spark-ignition operation for temperature increase would be an alternative starting procedure.
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