A Dynamical Systems Approach to Study Cellular Flame Instability

研究细胞火焰不稳定性的动力系统方法

• 批准号: 0504150
• 负责人: Jose Palacios
• 金额: $ 22.5万
• 依托单位: San Diego State University Foundation
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2005
• 资助国家: 美国
• 起止时间: 2005-08-01 至 2009-07-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0504150&HistoricalAwards=false
• 关键词: Dynamical; Systems; Approach; Study; Cellular

The goal of this project is to investigate, experimentally, numerically, and analytically, the formation, evolution, and possible control mechanisms of premixed cellular flame patterns. The proposed approach incorporates ideas and methods at the forefront of dynamical systems theory and equivariant bifurcation analysis with new computational methods. In particular, the project seeks to understand the underlying mechanisms that govern the flame dynamics as well as understanding the effects of noise on the flame characteristics, including velocity of propagation and flame shape.Lean premixed combustion is an emergent technology for attaining ultra-low Nitrogen Oxide emissions in advanced gas turbines. The technology, however, generates cellular flame instabilities that can damage the combustor hardware through overheating or vibration, producing cycle fatigue and worn combustor seals. Consequently, the task of understanding and controlling cellular flame instabilities is an important problem with a strong potential to reduce environmental impact of combustion. This research analyzes the mechanisms that govern flame dynamics. The project will educate graduate students in Applied Mathematics and in Computational Sciences through involvement in the research.

本项目的目标是通过实验、数值和分析研究预混蜂窝火焰模式的形成、演化和可能的控制机制。该方法融合了动力系统理论和等变分叉分析的前沿思想和方法以及新的计算方法。特别是，该项目旨在了解控制火焰动力学的潜在机制以及了解噪声对火焰特性的影响，包括传播速度和火焰形状。稀薄预混燃烧是在先进燃气轮机中实现超低氮氧化物排放的一项新兴技术。然而，该技术会产生蜂窝火焰不稳定性，可能会通过过热或振动损坏燃烧器硬件，产生循环疲劳和燃烧器密封件磨损。因此，了解和控制蜂窝火焰的不稳定性是一个重要的问题，具有很大的潜力来减少燃烧对环境的影响。这项研究分析了支配火焰动力学的机制。该项目将通过参与研究来教育研究生应用数学和计算科学。