Premixed Flame Propagation in the Flamelet Regime

小火焰状态下的预混合火焰传播

• 批准号: 0074320
• 负责人: Moshe Matalon
• 金额: $ 25.54万
• 依托单位: Northwestern University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2000
• 资助国家: 美国
• 起止时间: 2000-07-01 至 2005-06-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0074320&HistoricalAwards=false
• 关键词: Premixed; Flame; Propagation; Flamelet; Regime

The objective of this research in to understand complex flame-flow interactions that occur in laminar flames but have direct implications to premixed turbulent combustion, particularly in the flamelet regime. Models simulating these systems are investigated using both asymptotic techniques and numerical methods. In this work, two problems are considered. In the first, the structure, dynamics, and extinction of premixed edge flames in mixtures containing gradients of temperature or concentration are investigated. Because enthalpy variations affect the flame temperature and hence the rates of thermally sensitive chemical reactions, they influence fuel consumption, flame quenching, and emission of chemical pollutants; effects due to Lewis number, stoichiometry, and thermal expansion are also examined. The second issue concerns flame propagation in Poiseuille flow in which flame propagation depends on the intensity and scale of the underlying flow field. Total burning rate, flame shape, and propagation speed are parameters of interest, especially under conditions in which flashback is suppressed in the absence or presence of heat losses.

本研究的目的是了解复杂的火焰流动相互作用，发生在层流火焰，但有直接的影响，预混湍流燃烧，特别是在小火焰制度。 模拟这些系统的模型研究使用渐近技术和数值方法。 在这项工作中，考虑两个问题。 在第一，结构，动力学，并在含有温度或浓度梯度的混合物预混边缘火焰熄灭进行了研究。 由于焓的变化会影响火焰温度，因此热敏化学反应的速率，它们会影响燃料消耗，火焰淬火，和化学污染物的排放;由于刘易斯数，化学计量，和热膨胀的影响也进行了检查。 第二个问题涉及火焰在Poietille流中的传播，其中火焰传播取决于底层流场的强度和尺度。 总燃烧速率、火焰形状和传播速度是感兴趣的参数，特别是在没有或存在热损失的情况下抑制回火的条件下。