Numerical Simulation of Premixed Turbulent Combustion

研究者和他的研究小组正在开始一个项目，开发更复杂的预混湍流燃烧模型，其中燃烧典型的快速化学反应与伴随湍流的密度、浓度和温度波动之间的相互作用被更详细地处理。这些相互作用表现为沿火焰表面分离热产物气体和冷反应物气体的积分。近似这些积分的主要困难是，在所有尺度上湍流对火焰表面的扭曲是相关的，并最终影响火焰中的反应速率。需要有关相互作用的实验信息，以便对火焰刷中工作的基本过程有更全面的了解。研究者建议使用假设的火焰片通过均匀湍流的数值模拟来研究这些过程，作为实验工具。由于计算速度和存储的限制，模拟最重要的限制是可实现的相对适度的雷诺数。然而，对于简单的流动系统，他们已经表明，他们可以在一定范围内准确地表示湍流，这足以满足本提案的目的。核磁共振规划拨款旨在资助初步研究，这些研究将允许1)发展模拟湍流火焰的能力，2)开发解释这些模拟结果的工具，以改善整体建模工作。

The investigator and his research group are starting a program to develop more sophisticated models of premixed turbulent combustion, in which the interactions between the fast chemical reactions typical of combustion and the fluctuations in density, concentration, and temperature that accompany turbulence are addressed in more detail. These interactions appear as integrals along the flame surface separating the hot product gases from the cold reactant gases. The major difficulty in approximating these integrals is that distortion of the flame surface by turbulence at all scales is relevant and ultimately impacts on the rate of reaction in the flame. Experimental information about the interactions is required to develop a more thorough understanding of the fundamental processes at work in the flame brush. The investigator proposes to study these processes using numerical simulations of a hypothetical flame sheet passing through homogeneous turbulence, as an experimental tool. The most important limitation of simulations is the relatively modest Reynolds numbers that are achievable, due to constraints of computational speed and storage. However, for simple flow systems they have shown that they can accurately represent turbulence over a range of scales that is sufficient for the purposes of this proposal. The MRI planning grant is intended to fund preliminary studies that will allow to 1) develop the capability to simulate turbulent flames, and 2) develop tools to interpret the results of those simulations to improve the overall modeling effort.