Tailored mode excitation for control of jets in crossflow

[1437014]王晓燕，王晓燕。射流在横向流动（JICF）中的行为是当前研究的重点。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，因此本文提出的工作将对具有定制行为的JICF系统的工程产生重大影响。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，合作项目负责人还将在南加州社区学院为学生做演讲和示范，与校外的学生接触。为本地高中学生和CC学生提供在夏季获得实验室经验的机会。这是一个研究不稳定性对JICF行为影响的建议。这些不稳定性可能在喷气机上发展。S上游剪切层取决于横流特性（如流体密度、流体速度）。实验证据表明，这些不稳定性会深刻影响JICF的传播、轨迹和速度等。这一建议是一个基本的方法，以发展更深层次的机制理解，横流是如何导致不稳定的，以及确切的影响是什么。建议采用最先进的成像技术（立体粒子成像测速法和平面激光诱导荧光法）进行实验，并结合该过程的理论和建模，以发展预测能力，从而控制JICF的扩散和混合。

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.