Simplification of ignition kernel propagation with low-temperature oxidation and investigation on new regime of flame propagation

Research Project

Project/Area Number	23760174
Research Category	Grant-in-Aid for Young Scientists (B)
Allocation Type	Multi-year Fund
Research Field	Thermal engineering
Research Institution	Tohoku University
Principal Investigator	NAKAMURA Hisashi 東北大学, 流体科学研究所, 助教 (40444020)
Project Period (FY)	2011 – 2012
Project Status	Completed (Fiscal Year 2013)
Budget Amount *help	¥4,420,000 (Direct Cost: ¥3,400,000、Indirect Cost: ¥1,020,000) Fiscal Year 2012: ¥1,820,000 (Direct Cost: ¥1,400,000、Indirect Cost: ¥420,000) Fiscal Year 2011: ¥2,600,000 (Direct Cost: ¥2,000,000、Indirect Cost: ¥600,000)
Keywords	燃焼 / 着火 / 冷炎 / 低温酸化反応 / 火炎伝ぱ
Research Abstract	Ignition kernel propagation in the system with a temperature gradient at high pressures was recorded by a high-speed camera for n-heptane and iso-octane, which are primary reference fuels of gasoline. In the iso-octane case, as a flame propagated to the upstream (low-temperature region), the propagation speed monotonically decreased. In the n-heptane case, on the other hand, on the way of the ignition kernel propagation, the propagation speed showed rapid increase and decrease. In the numerical simulation, small heat release in the upstream of the ignition kernel due to the low-temperature oxidation was observed. Therefore, the rapid variation of the propagation speed in the n-heptane case would be due to re-ignition by the low-temperature oxidation.