Liquid fuel combustion: Droplets formation, vaporization and combustion

液体燃料燃烧：液滴形成、汽化和燃烧

• 批准号: RGPIN-2017-05468
• 负责人: Birouk, Madjid
• 金额: $ 1.6万
• 依托单位: University of Manitoba
• 依托单位国家: 加拿大
• 项目类别: Discovery Grants Program - Individual
• 财政年份: 2018
• 资助国家: 加拿大
• 起止时间: 2018-01-01 至 2019-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=645520
• 关键词: Liquid; fuel; combustion; Droplets; formation

Spray/Droplets formation, vaporization and combustion are the processes controlling the efficiency and emissions of power generation systems such as gas turbine and diesel engine. In the combustion chamber of these systems, upon its injection, liquid fuel breaks up into droplets to increase the mixing between the oxidant and fuel but more importantly to ease and enhance the vaporization process of liquid fuel and hence the combustion performance. Therefore, understanding these processes is crucial for the design and development of these systems. Although the characteristics of a liquid jet injected into a gaseous flow have been studied extensively, there still remain many challenges. This is due mainly to a) the complex nature of this two-phase flow phenomenon and b) the fact that these processes depend on the engine load requirements as well as the injection system, and state and conditions of the surroundings fluid flow.***For instance, the features of a liquid jet injected into a gaseous environment vary significantly with liquid properties, operating/test conditions of the surroundings airflow and nozzle/injector internal geometry. Currently used computer codes employed by industry for modeling and designing spray combustion still rely on untested approximations of the effect of gas phase turbulence. This is mainly driven by the lack of knowledge on the effect of gas phase turbulence on droplets (or spray) vaporization especially under realistic test conditions. Additionally, although there exist several published computer studies on the burning characteristics of droplets under flow conditions simulating those encountered in real combustion chambers, experimental data reporting on the effect of gas phase turbulence at elevated pressure and temperature conditions on micron-sized (realistic) droplets is still unavailable.***The proposed research program will lead to significant scientific advances where new knowledge and comprehensive data at realistic test conditions will be generated. The findings of this research will greatly aid Canadian (e.g., aerospace and automobile) industry to construct more reliable computer codes/models for designing efficient and less pollutant power generation systems. In addition, several HQP (5 graduate and 4 undergraduate students), who will trained during the course of the proposed research, will acquire the knowledge and skills in demand for the Canadian aerospace and automotive industry as well as other energy sectors.

喷雾/液滴形成，汽化和燃烧是控制发电系统（例如燃气轮机和柴油发动机）的效率和排放的过程。在这些系统的燃烧室中，注射后，液体燃料会分解成液滴，以增加氧化剂和燃料之间的混合，但更重要的是，可以缓解和增强液体燃料的汽化过程，从而增强燃烧性能。因此，了解这些过程对于这些系统的设计和开发至关重要。尽管已经广泛研究了注入气体流动流中的液体射流的特征，但仍然存在许多挑战。这主要是由于a）这种两相流量现象的复杂性，b）这些过程取决于发动机负荷需求以及注入系统，以及周围环境流体流动的状态和条件。** *例如，注射到气态环境中的液体射流的特征随液体性能，周围气流的操作/测试条件以及喷嘴/喷油器内部几何形状有显着变化。目前使用行业使用的计算机代码来建模和设计喷雾燃烧仍然依赖于未经测试的气相湍流影响的近似值。这主要是由于缺乏对气相湍流对液滴（或喷雾）蒸发的影响，尤其是在逼真的测试条件下的影响。此外，尽管在流动条件下，有几项关于液滴燃烧特征的计算机研究，模拟了实际燃烧室中遇到的液滴，但实验数据报告了升高压力和温度条件上气相湍流对微米（现实）液滴的影响***拟议的研究计划将导致重大的科学进步，在现实测试条件下新的知识和全面数据。这项研究的发现将极大地帮助加拿大（例如航空航天和汽车）行业构建更可靠的计算机代码/模型，以设计高效且污染物较少的发电系统。此外，将在拟议的研究过程中接受培训的几位HQP（5名研究生和4名本科生）将获得对加拿大航空航天和汽车行业以及其他能源部门的需求知识和技能。