ERI: Computational Investigation of High-Pressure Turbulent Premixed Flames - Physical Insights and Two-Scale Predictive Modeling

ERI：高压湍流预混火焰的计算研究 - 物理见解和两尺度预测建模

• 批准号: 2301829
• 负责人: Reetesh Ranjan
• 金额: $ 15.94万
• 依托单位: University of Tennessee Chattanooga
• 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: 2023-07-01 至 2025-06-30
• 项目状态: 未结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=2301829&HistoricalAwards=false
• 关键词: ERI; Computational; Investigation; Pressure; Turbulent

Premixed combustion is observed in aeronautical and automotive engines, which are typically operated at high pressure and under turbulent flow conditions to yield higher fuel efficiency, compact design, and lower emissions. The interplay of various combustion processes such as species transport, chemical reactions, and heat release makes the computational investigation of flame-turbulence interactions in these applications a challenging task, particularly when a detailed chemical description is essential. Past fundamental studies have primarily focused on the analysis of such flames at atmospheric pressure. In this work, aspects of high-pressure turbulent premixed flames will be addressed by providing fundamental insights into the effects of pressure and establishing an efficient physics-based computational model. This investigation will also integrate research and education by enriching courses in fluid mechanics and thermal sciences; empower undergraduate and graduate students from diverse backgrounds with advanced knowledge and computational skills; and mentor university-supported undergraduate scholars to develop goals and skills.High-pressure turbulent premixed flames observed in energy conversion and propulsion devices are multi-scale in nature, which makes their fundamental investigation extremely challenging. While direct numerical simulation can provide detailed insights into flame-turbulence interactions, it tends to be computationally prohibitive for the study of practical applications. To this end, large-eddy simulation is a promising modeling strategy; however, some challenges need to be addressed for it to be predictive. Additionally, most of the past fundamental studies have focused on examining the characteristics of such flames at atmospheric pressure, thus requiring further studies, particularly, focusing on the analysis of the multi-scale interactions within the flame region. This proposal will address these challenges by (i) providing fundamental insights into the effects of pressure on premixed flame-turbulence interactions in canonical configurations, (ii) assessing the capabilities of a novel two-scale physics-based predictive modeling strategy, and (iii) examining the behavior of different types of fuels under high-pressure conditions. The outcomes of the project will have a broader impact on the field of turbulent combustion as it will lead to an improved understanding of features of high-pressure turbulent premixed flames, and demonstrate the capabilities of a multi-scale model, which can be used to study practical configurations.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.

在航空和汽车发动机中观察到预混合燃烧，这些发动机通常在高压和湍流条件下运行，以产生更高的燃油效率、紧凑的设计和更低的排放。各种燃烧过程（例如物质传递、化学反应和热量释放）的相互作用使得这些应用中火焰-湍流相互作用的计算研究成为一项具有挑战性的任务，特别是当详细的化学描述至关重要时。过去的基础研究主要集中在大气压下此类火焰的分析。在这项工作中，将通过提供对压力影响的基本见解并建立有效的基于物理的计算模型来解决高压湍流预混合火焰的各个方面。这项调查还将通过丰富流体力学和热科学课程将研究和教育结合起来；为来自不同背景的本科生和研究生提供先进的知识和计算技能；并指导大学支持的本科生学者发展目标和技能。在能量转换和推进装置中观察到的高压湍流预混火焰本质上是多尺度的，这使得他们的基础研究极具挑战性。虽然直接数值模拟可以提供对火焰-湍流相互作用的详细见解，但对于实际应用的研究来说，其计算量往往过高。为此，大涡模拟是一种有前途的建模策略；然而，要使其具有预测性，还需要解决一些挑战。此外，过去的基础研究大多集中在大气压下火焰的特性研究，因此需要进一步的研究，特别是火焰区域内多尺度相互作用的分析。该提案将通过以下方式解决这些挑战：（i）提供关于压力对规范配置中预混火焰-湍流相互作用的影响的基本见解，（ii）评估新型双尺度基于物理的预测建模策略的能力，以及（iii）检查不同类型燃料在高压条件下的行为。该项目的成果将对湍流燃烧领域产生更广泛的影响，因为它将提高对高压湍流预混火焰特征的理解，并展示多尺度模型的能力，该模型可用于研究实际配置。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。