Tailored mode excitation for control of jets in crossflow

1437014。拟议的研究重点是了解和控制横流中的射流行为(JICF)。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将通过为南加州社区学院的学生提供演示和演示，接触到他们所在大学以外的学生。将为当地高中生以及CC学生提供在暑期获得实验室经验的机会。这是一项研究不稳定对行为影响的建议。这些不稳定性可能发生在射流-S上游剪切层，这取决于横流特性(如流体密度、流体速度)。实验证据表明，这些不稳定性可以深刻地影响JICF的扩散、轨迹、速度等。这一建议是深入了解横流是如何导致不稳定性的，以及确切的影响是什么的根本途径。建议进行实验，采用最先进的成像技术(立体粒子图像测速仪和平面激光诱导荧光)，结合过程的理论和建模，以开发能够控制JICF扩散和混合的预测能力。

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.