| Project/Area Number |
06555062
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| Research Category |
Grant-in-Aid for Scientific Research (A)
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| Allocation Type | Single-year Grants |
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| Section | 試験 |
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| Research Field |
Thermal engineering
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| Research Institution | KYUSHU UNIVERSITY |
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Principal Investigator |
ONO Shinsuke KYUSHU UNIVERSITY,FACULTY OF ENGINEERING,PROFESSOR, 工学部, 教授 (80037738)
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| Co-Investigator(Kenkyū-buntansha) |
KAWANO Hideaki KYUSHU UNIVERSITY,FACULTY OF ENGINEERING,RESEARCH ASSOCIATE, 工学部, 助手 (30037915)
HANADA Kunihiko KYUSHU UNIVERSITY,FACULTY OF ENGINEERING,RESEARCH ASSOCIATE, 工学部, 助手 (30037874)
HIRAYAMA Yoshinori KYUSHU UNIVERSITY,FACULTY OF ENGINEERING,LECTURER, 工学部, 講師 (40253504)
MURASE Eiichi KYUSHU UNIVERSITY,FACULTY OF ENGINEERING,ASSOCIATE PROFESSOR, 工学部, 助教授 (60150504)
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| Project Period (FY) |
1994 – 1996
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| Project Status |
Completed (Fiscal Year 1996)
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| Budget Amount *help |
¥8,400,000 (Direct Cost: ¥8,400,000)
Fiscal Year 1996: ¥400,000 (Direct Cost: ¥400,000)
Fiscal Year 1995: ¥2,100,000 (Direct Cost: ¥2,100,000)
Fiscal Year 1994: ¥5,900,000 (Direct Cost: ¥5,900,000)
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| Keywords | LEAN COMBUSTION / SWIRL / IGNITION TIMING CONTROL / MULTIPLE IGNITION / MULTI-POINT IGNITION / CONVECTIVE FLAME MOTION / NATURAL GAS ENGINE / HEAT RELEASE RATE / スワール / 天然ガス機関 / 低NOx / 点火時期遅延 / ノッキング / 点火 / 熱発生率制御 / ガス機関 / 遠心加速度 |
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| Research Abstract |
In this study, the effects of swirl on the early flame development and late combustion characteristics are investigated in relation to the number of and the intervals of flame kernels using the single cylinder test engine fueled with methane. The flame kernels are ignited in the swirling flow of mixture by means of multiple sparks with one ignition source. A sequential flamelet appears in the outer part of the swirling flow in the cylinder by the intermittent spark ignition system at controlled intervals. The analysis of the combustion tests show that adequate spark timing and series of kernels could improve the mean effective pressure, keeping the maximum pressure down, and also showed a possibility of preventing the increase of NOx formation.
The important results are as follows :
1) in a lean combustion flame, the control of heat release rate becomes possible in a wide range of engine operation by utilizing convective motion of flame in a swirl.
2) multiple ignition and/or multi-point ignition are useful for the active control of combustion by changing the first ignition timing and the subsequent ignition timing.
3) retardation of the first ignition timing effectively reduces NOx emission without appreciable change of performance for the worse due to improved combustion by the subsequent flames.
4) The optimum selection of the spark timings becomes possible depending on the flow conditions and flame speed in the combustion chamber.
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