| Project/Area Number |
10650225
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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 | NIHON UNIVERSITY |
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Principal Investigator |
UJIIE Yasushige NIHON UNIVERSITY, COLLEGE OF INDUSTRIAL TECHNOLOGY,PROFESSOR, 生産工学部, 教授 (20060197)
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| Co-Investigator(Kenkyū-buntansha) |
NOMURA Hiroshi NIHON UNIVERSITY, COLLEGE OF INDUSTRIAL TECHNOLOGY,ASSOCIATE, 生産工学部, 助教授 (30246847)
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| Project Period (FY) |
1998 – 1999
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| Project Status |
Completed (Fiscal Year 1999)
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| Budget Amount *help |
¥3,300,000 (Direct Cost: ¥3,300,000)
Fiscal Year 1999: ¥1,700,000 (Direct Cost: ¥1,700,000)
Fiscal Year 1998: ¥1,600,000 (Direct Cost: ¥1,600,000)
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| Keywords | Spark Ignition / Combustible Mixture / Spark Electrode / Spark Energy / Flanged Electrode / Gasoline Engine / Shock Wave / Turbulence |
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| Research Abstract |
Spark ignition characteristics of flanged electrodes have been studied experimentally to reduce the spark energy in act6ual Spark Ignition engines. Propane-air mixtures were ignited at the gap of two parallel flanges by spark discharge or focused laser light. The laser light ignition was applied to realize the ignition process without spark discharge, which makes phenomena complicated. The Propane-aire mixtures were used to keep the mixture strength constantly. Experiments were performed under quiescent and turbulent fields. The minimum ignition energy was employed to evaluate the ignition characteristics of the flanged electrodes. It was found that the minimum ignition energy is reduced by using the flanged electodes and the reducing effect becomes remarkable with the increase in the turbulence intensity. By schlieren photography, it was observed that the shock wave reflected by the flanges interfered with a flame kernel, This fact suggests that the adiabatic compression which occurs in this process causes the reduction of the minimum ignition energy. However the heat loss from the flame kernel to the flanges cannot be disregarded because the flanges suppress the growth of the flame kernel. Otherwise, the flanged electrodes suppress the turbulence intensity and reduce the minimum ignition energy.
Some actual type sparking plugs were made for the purpose of confirmation of the experimental results mentioned above. The sparking plugs were attached pear of ceramics flange on a actual sparking plug. Experiments were performed under quiescent fields. The results shows that the actual type sparking plugs make reduction the minimum ignition energy in the same manner as the parallel flanged electrodes.
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