Study on unburned methane reduction technique of lean mixture under high ambient pressure conditions

2015 Fiscal Year Final Research Report

• Project/Area Number: 25420877
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Research Field: Naval and maritime engineering
• Research Institution: National Maritime Research Institute
• Principal Investigator: Takagi Masahide 国立研究開発法人 海上技術安全研究所, その他部局等, 研究員 (50371092)
• Co-Investigator(Kenkyū-buntansha): KAWAUCHI Satoshi 国立研究開発法人 海上技術安全研究所, その他の部局等, 研究員 (20549993) ; IMAI Yasuo 国立研究開発法人 海上技術安全研究所, その他の部局等, 研究員 (40426218)
• Project Period (FY): 2013-04-01 – 2016-03-31
• Keywords: ガス燃焼 / メタンスリップ低減 / 高圧化 / 自着火 / 急速燃焼

Outline of Final Research Achievements

It is required to reduce unburnt methane from natural gas engines. Methane has a high global warming potential and the impact of methane on global warming is 20 times that of carbon dioxide. The rapid combustion by auto-ignition resulting from unburnt region and reduction of the quenching distance by the high ambient pressure have been proposed as a methane reduction technique.
As a result, auto-ignition which do not affect the combustion (pressure rise) was not able to reduce the unburnt methane. Reduction of 25% methane concentration could be achieved by an increase from 2.0 to 4.5MPa of ambient pressure at ignition timing.

Free Research Field

内燃機関工学