| Project/Area Number |
07651119
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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 |
Aerospace engineering
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| Research Institution | University of Tokyo |
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Principal Investigator |
WADA Yoshiyuki University of Tokyo School of Engineering Research associate, 大学院・工学系研究科, 助手 (20011158)
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| Project Period (FY) |
1995 – 1996
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| Project Status |
Completed (Fiscal Year 1996)
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| Budget Amount *help |
¥2,200,000 (Direct Cost: ¥2,200,000)
Fiscal Year 1996: ¥600,000 (Direct Cost: ¥600,000)
Fiscal Year 1995: ¥1,600,000 (Direct Cost: ¥1,600,000)
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| Keywords | Internal Combustion Engine / Combustion / NOx |
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| Research Abstract |
The objective of the present study was to investigate the possibility of the control of combustion and pollutant emission characteristics using the variable-shaped combustion chamber. At the first stage of this study, the flame propagation behavior was observed for closed vessels with various shape using the schlieren photography. The variation of the chamber pressure with time was also measured. The results showed that the flame propagation behavior and pressure history were affected largely by the shape of the closed vessel. It was suggested that the shape of the flame front was one of dominant factors of the combustion characteristics. To explore the effect of the heat loss on the combustion and pollutant emission characteristics, the variation of the chamber pressure with time and NO concentration were measured with the artificial heat loss in the flame propagation. The results showed that the artificial heat loss at the early stage of the combustion leads to about 40% reduction of NO concentration, while it has little effect on the maximum chamber pressure, which is closely related to the thermal efficiency. This result indicates that the decrease in the temperature of the burned gas which due to the heat loss leads to the reduction of NO concentration. To investigate effects of gas motion and turbulence on combustion and pollutant emission characteristics, the combustion experiments of the methane jets in high temperature environments were made. The atttention was paid to the effect of the arrangement of injectors on the combustion. It was found that the NO concentration for opposed jets is lower than that for single jet. This result may be caused by the difference between mixing and combustion processes for opposed jets and single jet.
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