Tailored mode excitation for control of jets in crossflow

用于控制横流射流的定制模式激励

• 批准号: 1437014
• 负责人: Ann Karagozian
• 金额: $ 31.34万
• 依托单位: University of California-Los Angeles
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2014
• 资助国家: 美国
• 起止时间: 2014-07-15 至 2018-06-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1437014&HistoricalAwards=false
• 关键词: Tailored; mode; excitation; control; jets

1437014 Karagozian, Ann R.The focus of the proposed research is to understand and control the behavior of jets in crossflow (JICF). Since the presence of JICF is prevalent in a plethora of engineering and technological applications related to energy production, propulsion, and combustion, the work proposed here would have a significant impact in engineering JICF systems with tailored behavior. In that case, increasing fuel efficiency and reducing emissions would have an impact on the national economy and the environment. In addition, the co-PIs will reach students outside of their university with presentations and demonstrations for students at Community Colleges in Southern California. Opportunities for local high school students as well as CC students to gain laboratory experiences in the summer will be provided.This is a proposal to study the effects of instabilities on the behavior JICF. These instabilities may develop at the jet?s upstream shear layer depending on the crossflow characteristics (e.g., fluid density, fluid velocity). Experimental evidence indicates that these instabilities can profoundly affect the JICF spreading, trajectory, speed etc. This proposal is a fundamental approach to develop a deeper mechanistic understanding of how the crossflow leads to the instabilities, and what the effects are exactly. Experiments that employ state-of-the-art imaging techniques (stereo-particle image velocimetry and planar laser-induced fluoresence), in combination with theory and modeling of the process are proposed, in order to develop predictive capabilities that allow control of spreading and mixing of JICF.

1437014 Karagozian, Ann R.拟议研究的重点是理解和控制横流 (JICF) 中射流的行为。由于 JICF 的存在普遍存在于与能源生产、推进和燃烧相关的大量工程和技术应用中，因此这里提出的工作将对具有定制行为的 JICF 系统工程产生重大影响。在这种情况下，提高燃油效率和减少排放将对国民经济和环境产生影响。此外，联合 PI 还将为南加州社区学院的学生进行演示和演示，从而接触到大学以外的学生。将为当地高中生以及 CC 学生提供暑期获得实验室经验的机会。这是一项研究不稳定性对行为 JICF 的影响的提案。根据横流特性（例如流体密度、流体速度），这些不稳定性可能会在射流的上游剪切层处出现。实验证据表明，这些不稳定性会深刻影响 JICF 的扩散、轨迹、速度等。该提议是一种基本方法，可以更深入地了解横流如何导致不稳定性以及其影响到底是什么。提出了采用最先进的成像技术（立体粒子图像测速和平面激光诱导荧光）并结合过程理论和建模的实验，以开发可控制 JICF 扩散和混合的预测能力。