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.

通过高速摄像头用于N- h-Heptane和Iso-octane，该系统中具有高压温度梯度的点火内核传播，它们是汽油的主要参考燃料。在异辛烷情况下，作为在上游（低温区域）传播的火焰中，传播速度单调降低。另一方面，在N-嗜酮烷的情况下，在点火内核传播的途中，繁殖速度显示出快速增加和减少。在数值模拟中，观察到由于低温氧化而引起的点火内核上游的小热释放。因此，在N-嗜硫烷情况下，传播速度的快速变化将是由于低温氧化的重新点燃。