Autoignition-assisted flame regime of sustainable aviation fuel, ammonia and dimethyl ether blends

可持续航空燃料、氨和二甲醚混合物的自燃辅助火焰状态

• 批准号: 2324471
• 负责人: Omid Samimi-Abianeh
• 金额: $ 34.5万
• 依托单位: Wayne State University
• 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: 2023-08-01 至 2026-07-31
• 项目状态: 未结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=2324471&HistoricalAwards=false
• 关键词: Autoignition; assisted; flame; regime; sustainable

This project aims to study the combustion behavior of a new class of sustainable and environmentally friendly fuels for energy applications. Such new fuels will help reduce carbon emissions in the energy, transportation, and industrial sectors. One of the critical components of the new fuel is ammonia (NH3), a fuel with high hydrogen content. While ammonia can be stored and transported more safely than hydrogen, ammonia combustion differs from traditional fossil fuels like gasoline, diesel, and aviation fuels. Therefore, this research project aims to investigate a combination of ammonia and a highly reactive and biomass derived Dimethyl Ether (DME) to replicate the practical combustion behavior of traditional fossil fuels.Flame speed and ignition delay are two fundamental fuel mixture characteristics that play significant roles in the combustion process. Both characteristics have been studied extensively for their importance in designing and developing advanced combustion systems. However, the combustion regime in which the flame and autoignition simultaneously affect the combustion process is not well understood. This combustion regime is called autoignition-assisted flame and has a different morphology and characteristics with respect to traditional laminar premised or diffusion flames. In this combustion regime, the flame propagates over a pool of intermediate species, which are produced due to the low-temperature chemistry of the mixture. The research objective here is to understand and quantify the autoignition-assisted premixed laminar flame of ammonia and DME blends at elevated gas temperatures and pressures. The flame regimes across various gas temperatures, pressures, equivalence ratios, and Damkӧhler numbers will be investigated experimentally and numerically. The Rapid Compression Machine–Flame (RCM-FLAME) apparatus is used to study the flame regime with several optical diagnostic techniques. The proposed project has four transformative aspects: (1) quantification of flame propagation speed over a wide range of physico-chemical conditions, (2) experimental investigation of the effects of first-stage and second-stage autoignition on flame propagation speed, (3) the effect of stretch on outwardly propagating spherical autoignition-assisted flames, and (4) accuracy of kinetic models developed in simulating the combustion of ammonia-DME mixtures.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.

该项目旨在研究用于能源应用的新型可持续和环保燃料的组合行为。这种新燃料将有助于减少能源，运输和工业领域的碳排放。新燃料的关键组成部分之一是氨（NH3），这是一种具有较高氢含量的燃料。虽然氨可以比氢更安全地储存和运输，但氨组合与传统化石燃料（如汽油，柴油和航空燃料）的差异。因此，该研究项目旨在研究氨和高反应性和生物质衍生的二甲基醚（DME），以复制传统化石燃料的实际组合行为。Flame速度和点火延迟是两个基本燃料混合物在混合过程中起着重要作用的基本燃料混合物。对于它们在设计和开发高级燃烧系统中的重要性，对这两种特征进行了广泛的研究。但是，在同时影响燃烧过程的火焰和自动观念的燃烧方案尚不清楚。这种燃烧制度称为自动签署的火焰，在传统的层流前提或差异方面具有不同的形态和特征。在这种燃烧方案中，火焰在一个中间物种池上传播，这些中间物种是由于混合物的低温化学作用而产生的。这里的研究目的是在升高的气体温度和压力下了解和量化氨和DME混合物自动辅助预混合的层状火焰。各种气体温度，压力，等效比率和Damknamehler数量的火焰状态将在实验和数值上进行研究。快速压缩机 - 弹药（RCM-FLAME）设备用于使用几种光学诊断技术研究火焰状态。拟议的项目具有四个变革性的方面：（1）在广泛的物理化学条件下的火焰繁殖速度数量，（2）对第一阶段和第二阶段自动化对火焰繁殖速度的影响的实验投资，（3）伸展对外部繁殖的繁殖式自动化式自动化的火焰和KINMONNOMONINIC的伸展对外部繁殖的模型的影响（3）该奖项反映了NSF的法定任务，并通过使用基金会的知识分子优点和更广泛的影响审查标准来评估，以诚实的支持。