Numerical Simulation of Premixed Turbulent Combustion

预混湍流燃烧的数值模拟

• 批准号: 9019818
• 负责人: Lance Collins
• 金额: $ 1.2万
• 依托单位: Pennsylvania State Univ University Park
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1990
• 资助国家: 美国
• 起止时间: 1990-10-01 至 1992-03-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9019818&HistoricalAwards=false
• 关键词: Numerical; Simulation; Premixed; Turbulent; Combustion

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.

调查员和他的研究小组正在开始一项 计划开发更复杂的预混模型 湍流燃烧，其中， 快速的化学反应典型的燃烧和 密度、浓度和温度的波动 更详细地讨论了伴随湍流。 这些相互作用表现为沿着火焰的积分 将热产品气体与冷产品气体分离的表面 反应气体。 近似计算的主要困难是 这些积分是火焰表面的畸变， 所有尺度的湍流都是相关的， 影响火焰中的反应速率。 关于相互作用的实验信息是 需要更深入地了解 在火焰刷工作的基本过程。 的 研究人员建议使用 假想火焰片的数值模拟 通过均匀的湍流，作为一个 实验工具 最重要的限制 模拟是相对适度的雷诺数， 由于计算速度的限制， 和存储。 然而，对于简单的流动系统， 表明它们可以准确地表示 范围的规模，足以为目的， 这个提议。 MRI计划补助金旨在资助 初步研究将允许1）开发 模拟湍流火焰的能力，以及2）开发 解释这些模拟结果的工具， 改善整体建模工作。