ERI: Stretch Effects on Combustion Characteristics of Flames with Non-Uniform Curvature

ERI：非均匀曲率火焰燃烧特性的拉伸效应

• 批准号: 2302003
• 负责人: Vinicius Maron Sauer
• 金额: $ 20万
• 依托单位: The University Corporation, Northridge
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2023
• 资助国家: 美国
• 起止时间: 2023-06-01 至 2025-05-31
• 项目状态: 未结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=2302003&HistoricalAwards=false
• 关键词: ERI; Stretch; Effects; Combustion; Characteristics

From the flame of a match to state-of-the-art power and heat generation systems, combustion is ubiquitous in the world economy. Despite its prevalence, the complexity of the underlying processes in a flame still represents a challenge for scientists and engineers, especially considering the need for more stringent regulations for harmful emissions, uncontrolled fires, and climate change mitigation. To simplify the analysis of practical burners, it is common to employ reduced sets of physical and chemical processes retaining essential characteristics of the overall phenomenon. However, such an approach often oversimplifies relevant combustion attributes by neglecting the effect of curvature and stretch inherent to real-world flames. Therefore, the primary goal of this project is to provide a deep understanding of the influence of topography and stretch on combustion and sooting characteristics of non-uniformly curved flames. Results from the proposed investigation will generate data for combustion model development and validation to advance power and heat generation technologies to sustain U.S. energy security using clean fuels and its position as a global leader in sustainability. The project will also allow students from CSUN, a Master’s Hispanic Serving Institution, to participate in cutting-edge research and develop skillsets critical for preparing the future workforce in science and engineering.The proposed work will detail the effect of topography and stretch of non-uniformly curved non-premixed flame structures in their combustion and sooting characteristics. To this end, this project will study stretched curved flames to provide: (1) novel non-premixed counterflow configurations with non-uniform curvature; (2) experimental data detailing stretch and non-uniform curvature influence on the flame structure, stability, temperature, soot formation, and extinction; (3) a simplified theoretical framework for the description of stretched non-premixed flames with non-uniform curvature. New non-premixed opposed-flow experimental burners employing quadric surfaces, and combinations thereof, will be developed to produce flame topographies equivalent to those observed in flame elements from practical combustion systems. Particle image velocimetry will be used for fluid flow characterization, whereas soot and thin filament pyrometry will be employed to determine soot formation and flame temperature. Simplified reacting flow models based on potential flow solutions and infinitely fast chemistry will be developed to describe curvature effects on overall flame characteristics theoretically. The analysis and configurations proposed in this project will allow a better understanding of curvature and stretch influence on flame phenomena.This award reflects NSF's statutory mission and has been deemed worthy of support through evaluation using the Foundation's intellectual merit and broader impacts review criteria.

从火柴火焰到最先进的发电和发热系统，燃烧在世界经济中无处不在，尽管燃烧很普遍，但火焰中基本过程的复杂性仍然对科学家和工程师构成挑战。特别是考虑到对有害排放、不受控制的火灾和减缓气候变化制定更严格的法规的需要，为了简化实际燃烧器的分析，通常采用保留总体现象基本特征的简化物理和化学过程。这种方法往往过于简单化相关的因此，该项目的主要目标是深入了解地形和拉伸对非均匀弯曲火焰的燃烧和烟灰特性的影响。拟议的调查结果将为燃烧模型开发和验证生成数据，以推进发电和供热技术，以使用清洁燃料维持美国的能源安全及其作为可持续发展领域全球领导者的地位。硕士西班牙裔服务机构，参与尖端研究并开发对未来科学和工程劳动力做好准备至关重要的技能组合。拟议的工作将详细说明非均匀弯曲非预混火焰结构在燃烧中的地形和拉伸的影响为此，该项目将研究拉伸弯曲火焰，以提供：（1）具有非均匀曲率的新型非预混合逆流配置；（2）详细说明拉伸和非均匀的实验数据。曲率对火焰结构、稳定性、温度、烟灰形成和熄灭的影响；（3）用于描述具有不均匀曲率的新型非预混对流实验燃烧器的简化理论框架。表面及其组合将被开发以产生与实际燃烧系统中火焰元件中观察到的火焰形貌相当的火焰形貌，颗粒图像测速将用于流体流动表征，而烟灰和薄层。将采用灯丝高温测定法来确定基于势流解决方案和无限快速化学的简化反应流模型，以从理论上描述对整体火焰特性的曲率影响。更好地理解曲率和拉伸对火焰现象的影响。该奖项反映了 NSF 的法定使命，并通过使用基金会的智力价值和更广泛的影响审查标准进行评估，被认为值得支持。