In-situ Diagnostics and Modeling of Ammonia spray Physics and Combustion Behavior at Elevated Pressure

高压下氨喷雾物理和燃烧行为的原位诊断和建模

• 批准号: 2225803
• 负责人: Peng Zhao
• 金额: $ 50万
• 依托单位: University of Tennessee Space Institute
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2022
• 资助国家: 美国
• 起止时间: 2022-08-01 至 2025-07-31
• 项目状态: 未结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=2225803&HistoricalAwards=false
• 关键词: situ; Diagnostics; Modeling; Ammonia; spray

With the global trend of decarbonization and growing interests in sustainable transportation and propulsion, it becomes increasingly important to understand the combustion performance and emission characteristics of carbon-free fuels under practical operation conditions. Ammonia has attracted extensive research interests as a carbon-free fuel and an effective hydrogen carrier, due to its relatively high volumetric energy density, low cost, convenience to store and deliver, and mature production infrastructure from renewable resources. A major obstacle yet to be resolved is the emission of nitric oxide and unburnt ammonia during combustion, both of which are strongly coupled with the spray and mixing process. This proposal focuses on the understanding the characteristics of high-pressure liquid ammonia spray and combustion, with pressures up to 80 bar, to inform future carbon-free transportation and propulsion systems. The proposed efforts will also broaden participation in research and integrate research with teaching to enhance student learning. The proposed work will not only impact on the fundamental spray dynamics and combustion kinetics, but also be transformative for the development of carbon-free transportation and propulsion systems.The goal of this research is to combine comprehensive in-situ laser diagnostics and numerical simulation to provide in-depth understanding of ammonia sprays under non-vaporizing, vaporizing, and reacting conditions. This fills a substantial knowledge gap and requires a combination of expertise in advanced laser diagnostics and high-fidelity numerical simulations. Advanced laser diagnostics will include 2D Raman, PLIF and rainbow reflectometry to acquire flow, key reaction intermediates and droplet size distribution. These experimental measurements will provide unprecedented details about the performance and emission characteristics of high-pressure ammonia combustion as a carbon-free fuel. Information of the flow, temperature, droplet and chemical intermediate distribution will also provide valuable targets to validate simulations using both open source CFD code and commercial software to enhance modeling and prediction capability for future clean combustion systems.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.

随着全球脱碳化和对可持续运输和推进的兴趣不断增长的趋势，了解在实际操作条件下，了解无碳燃料的燃烧性能和排放特性变得越来越重要。由于其相对较高的体积能量密度，低成本，存储和交付的便利性以及可再生资源的成熟生产基础设施，因此氨将其作为无碳燃料和有效的氢载体吸引了广泛的研究兴趣。尚未解决的主要障碍是燃烧过程中一氧化氮和未燃烧的氨的发射，这两种氧化物都与喷雾和混合过程强烈结合。该提案的重点是理解高压液体氨水喷雾和燃烧的特征，压力最高为80 bar，以告知未来的无碳运输和推进系统。拟议的努力还将扩大研究并将研究与教学相结合以增强学生学习。 The proposed work will not only impact on the fundamental spray dynamics and combustion kinetics, but also be transformative for the development of carbon-free transportation and propulsion systems.The goal of this research is to combine comprehensive in-situ laser diagnostics and numerical simulation to provide in-depth understanding of ammonia sprays under non-vaporizing, vaporizing, and reacting conditions.这填补了巨大的知识差距，需要在高级激光诊断和高保真数值模拟方面具有专业知识的结合。高级激光诊断将包括2D拉曼，PLIF和彩虹反射仪，以获取流量，关键反应中间体和液滴尺寸分布。这些实验测量将提供有关高压氨燃烧作为无碳燃料的性能和发射特性的前所未有的细节。流量，温度，液滴和化学中间分布的信息还将提供有价值的目标，以使用开源CFD代码和商业软件来验证模拟，以增强对未来清洁燃烧系统的建模和预测能力。该奖项反映了NSF的法定任务，并被认为是通过基金会的知识优点和广泛影响来评估的法定任务，并被认为是值得的支持。