Characterizing the Atomization of a Liquid Mass

表征液体物质的雾化

• 批准号: RGPIN-2017-06353
• 负责人: Ashgriz, Nasser
• 金额: $ 1.82万
• 依托单位: University of Toronto
• 依托单位国家: 加拿大
• 项目类别: Discovery Grants Program - Individual
• 财政年份: 2020
• 资助国家: 加拿大
• 起止时间: 2020-01-01 至 2021-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=712210
• 关键词: Characterizing; Atomization; Liquid; Mass

Canada's commitment to Paris accord can only be realized with a significant reduction in emissions from oil and gas, and transportation sectors. Oil and gas accounts for 26% and transportation for 23% of Canada's total GHG emissions. In North America, combustion of gasoline and diesel fuel make up for 84% of all transportation energy. Therefore, any improvement in combustion energy efficiency, can have a large impact on the total emission. Combustion efficiency and emission intimately relate to the fuel injection and mixing inside the combustion chamber. More and more engines utilize Gasoline Direct Injection (GDI) because of its higher fuel efficiency. In addition, diesel and biodiesel fuels are become more popular, again because of their fuel efficiency. Therefore, further improvements in the fuel efficiency and emission reduction require a better understanding of the fuel injection and atomization processes and development of models to predict these processes. Such models can be implemented in spray combustion codes to modify engine designs, optimize the combustion efficiency, and reduce emissions. A novel experiment is proposed that will provide a well-defined characterization of the atomization process. Breakup of an initially stationary (suspended) liquid droplet by a high velocity gas jet will be studied. A systematic study of the breakup of a single droplet allows for the understanding of the effects of both physical and chemical properties of the fuel and injector geometry. Each droplet breakup event generates a certain number of droplets with certain size distribution. If we can model each event, then we will be able to model a liquid atomization process by combining several relevant droplet breakup events. Therefore, a single droplet breakup event will be the basis for our more general atomization model. Another goal of the present proposal is to develop a new spray droplet sizing system, so that spray researchers, developers and users can improve their spray nozzles. The proposed system is based on the traditional imaging method, however, it utilizes a novel arrangement for the lighting and the camera system with respect to the spray. A nano-second flash LED will be used to freeze the motion of fast moving droplets. This instrument will allow online characterization of a spray in an industrial setting, which can help all spray users improve system efficiency, reduce fuel consumption, and enhance fuel delivery. The proposed system will cost 20 times less than the currently available systems for spray sizing. An innovation than provides an order of magnitude improvement (10 times) in the existing system, is considered a disruptive innovation. Considering that sprays are used in a broad range of industries, we believe that the proposed device is truly a disruptive innovation.

加拿大对巴黎协定的承诺只有大幅减少了石油和天然气以及运输部门的排放量。石油和天然气占加拿大全温葡萄酒总排放量的23％的26％。在北美，汽油和柴油燃料的燃烧占所有运输能源的84％。因此，燃烧能源效率的任何改善都会对总排放产生很大的影响。燃烧效率和排放与燃烧室内的燃油注入和混合密切相关。由于其燃油效率较高，越来越多的发动机使用汽油直接注入（GDI）。此外，柴油和生物柴油燃料变得越来越流行，因为它们的燃料效率。 因此，燃油效率和减排的进一步提高需要更好地了解燃料注入和雾化过程以及模型的开发以预测这些过程。这样的模型可以在喷雾燃烧代码中实现，以修改发动机设计，优化燃烧效率并减少排放。 提出了一个新的实验，该实验将提供定义明确的雾化过程表征。 将研究最初的固定（悬浮）液滴对高速速度气射流的破裂。 对单滴分裂的系统研究，可以理解燃料和喷油器几何形状的物理和化学特性的影响。每个液滴分解事件都会生成一定数量的液滴，并具有一定的尺寸分布。如果我们可以对每个事件进行建模，那么我们将能够通过组合几个相关的液滴分解事件来对液态雾化过程进行建模。因此，单滴分解事件将是我们更通用的雾化模型的基础。 本提案的另一个目标是开发一个新的喷滴尺寸系统，以便喷雾研究人员，开发人员和用户可以改善喷嘴。拟议的系统基于传统的成像方法，但是，它利用了针对喷雾的照明和相机系统的新颖布置。纳米秒LED将用于冻结快速移动液滴的运动。该仪器将允许在工业环境中在线表征喷雾剂，这可以帮助所有喷雾使用者提高系统效率，降低燃油消耗并增强燃油输送。 所提出的系统的成本将比当前可用的喷雾尺寸系统低20倍。一项比在现有系统中提供的数量级改进（10倍）的创新被认为是一种破坏性的创新。考虑到喷雾在广泛的行业中使用，我们认为所提出的设备确实是一种破坏性的创新。