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

低温氧化点火核传播的简化及火焰传播新机制的研究

• 批准号: 23760174
• 负责人: NAKAMURA Hisashi
• 金额: $ 2.83万
• 依托单位: Tohoku University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Young Scientists (B)
• 财政年份: 2011
• 资助国家: 日本
• 起止时间: 2011 至 2012
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-23760174/
• 关键词: 燃焼; 着火; 冷炎; 低温酸化反応; 火炎伝ぱ

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.

用高速摄像机记录了汽油主要参考燃料正庚烷和异辛烷在高压温度梯度下的点火核传播过程。在异辛烷的情况下，当火焰向上游（低温区域）传播时，传播速度单调下降。另一方面，在正庚烷的情况下，在点火核繁殖的过程中，繁殖速度呈现出快速的增减。在数值模拟中，由于低温氧化，在点火核上游有少量的热释放。因此，在正庚烷的情况下，传播速度的快速变化可能是由于低温氧化引起的重燃。