| Budget Amount *help |
¥36,400,000 (Direct Cost: ¥28,000,000、Indirect Cost: ¥8,400,000)
Fiscal Year 2014: ¥6,240,000 (Direct Cost: ¥4,800,000、Indirect Cost: ¥1,440,000)
Fiscal Year 2013: ¥20,540,000 (Direct Cost: ¥15,800,000、Indirect Cost: ¥4,740,000)
Fiscal Year 2012: ¥9,620,000 (Direct Cost: ¥7,400,000、Indirect Cost: ¥2,220,000)
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| Outline of Final Research Achievements |
Gas engines are expected as strong substitutes for marine diesel engines, but premixed lean-burn gas engines suffer two massive flaws. One is abnormal combustion called knocking and the other is methane slip. This research proposes a novel reducing method of the methane slip through usage of a gas permeation membrane (GPM). The GPM forms stratified oxygen gradient inside a combustion chamber. O2-rich premixture biased toward a cylinder wall decreases a quenching distance and N2-rich premixture around a cylinder center controls knock tendency and NOx emission.
Following issues were numerically investigated, feasibility of a twin turbo-charging system, possibility of oxygen stratification during compression, and potential of the methane slip reduction on chemical analysis. Finally, combustion tests were done using a constant-volume chamber and a rapid compression-expansion machine, and the system was found to compromise the knock avoidance and the methane slip reduction effectively.
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