Imaging of Local Flame Chemistry and Flame Stretch to Improve Turbulent Combustion Models

摘要文件9529203 所提出的研究的目的是量化和模拟复杂的化学和拉伸效应，发生在预混火焰，因为它经历了湍流燃烧过程。 这一计划是先前由NSF资助的一个项目的延续。 PI计划利用各种激光诊断技术来研究与预混湍流燃烧有关的两个模型问题。 这些独特的火焰实验包括：（1）火焰前锋与孤立涡的相互作用，以及（2）火焰在长通道中各向同性均匀湍流中的传播，由一组风扇产生。 PI计划测量重要的自由基物种，包括CH，OH，O和H，以及拉伸率和涡度沿着预混火焰，因为它经历了一个不稳定的燃烧过程的配置文件。 他还计划获得先进的直接数值模拟（DNS）与复杂的化学和比较结果的火焰涡流和均匀湍流实验，并使用结果来测量所需的其他类型的模型的数量。

Abstract Driscoll 9529203 The objective of the proposed research is to quantify and model the complex chemistry and stretch effects that occur within a premixed flame as it undergoes a turbulent wrinkling process. This proposal is a continuation of a previously NSF funded program. The PI plans to make use of a variety of laser diagnostic techniques to investigate two model problems relevant to premixed turbulent combustion. These unique flame experiments include: (1) the interaction of a flame front with an isolated vortex, and (2) the flame propagation in an isotropic homogeneous turbulent flow in a long channel, generated by a set of fans. The PI plans to measure profiles of important radical species, including CH, OH, O and H, and the stretch rates and vorticity along a premixed flame as it undergoes an unsteady wrinkling process. He also plans to obtain advanced Direct Numerical Simulations (DNS) with complex chemistry and compare results to both the flame-vortex and the homogeneous turbulence experiments, and to use the results to measure quantities that are required by other types of models.