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.

以汽油的主要参比燃料正庚烷和异辛烷为研究对象，利用高速摄像机记录了高压下存在温度梯度的系统中点火核心的传播过程。在异辛烷的情况下，随着火焰传播到上游（低温区域），传播速度单调下降。而在正庚烷的情况下，在点火核的传播过程中，传播速度表现出快速的上升和下降。在数值模拟中，小的热释放在点火核心的上游，由于低温氧化观察到。因此，在正庚烷的情况下，传播速度的快速变化将是由于低温氧化的再点燃。