UNS: A Collaborative Approach to Exploring Control Strategies Based on Optimally-Growing Disturbances for Complex Flows

航空运输是一个最大限度地减少其环境影响的领域，包括发动机效率和减少喷气发动机噪音排放，将使增长成为可能。该建议的目的是调查，并最终控制，喷嘴中的射流噪声使用一套计算和实验技术。研究领域是国家感兴趣的运输领域，这是一项研究喷流相关基础物理学的建议，然后开发适当的主动控制方法来降低喷流噪声。共同PI建议采用双/相关致动器进行流量控制。第一组将位于喷嘴出口的上游，其中致动器操作参数将由最佳扰动理论预测指导，并将在边界层中引入扰动，以优先放大，产生有组织的结构。据预计，最佳激发相干结构将是高能量的其他不稳定模式的费用，因此，他们将构成一个明确的目标，为第二致动器设置（通常不是在射流剪切层的宽带湍流的情况下）。第二致动器组靠近高接收性喷嘴出口，将以与第一致动器的动作相关的方式进一步操纵有序结构，以实现控制目标。这项工作利用致动器的设计开发的合作PI，产生的干扰所规定的最佳扰动理论在一个有效的方式。这项研究还将产生广泛适用的可压缩流的基础知识，并开发分析工具和控制方法。 成功完成拟议的研究可以对航空航天，能源，汽车和其他应用中的相关问题产生影响，其中流量/噪声控制是重要的。共同PI建议利用他们的活动与佛罗里达先进航空推进中心（FCAAP）的K-12外展活动，FSU领导的多所大学，全州卓越中心。PI是由佛罗里达A M大学（HBCU）和FSU共同管理的工程学院的成员，该学院一直被评为非洲裔美国工程师的顶级教育者。参与这项研究的学生及其成果将来自文化多样性的学生群体。此外，还建议将研究纳入研究生课程的教学。

Air transportation is an area where minimization of its environmental impact, including engine efficiency and reduction of jet engine noise emissions, would enable growth. This proposal is aimed at investigating, and eventually controlling, jet noise in a nozzle using a suite of computational and experimental techniques. The area of research is in transportation, an area of National interest.This is a proposal to research the relevant fundamental physics of jet flow and then develop appropriate active control methods for jet noise reduction. The co-PIs propose to employ dual/correlated actuators for flow control. The first set will be located upstream of the nozzle exit where the actuator operating parameters will be guided by optimal perturbation theory predictions and will introduce disturbances in the boundary layer tailored to be preferentially amplified, generating organized structures. It is anticipated that the optimally excited coherent structures will be highly energetic at the expense of other instability modes; they will thus constitute a well-defined target for the second actuator set (not normally the case for broadband turbulence in jet shear layers). The second actuator set, near the highly receptive nozzle exit, will further manipulate the organized structures, in a manner correlated to the first actuator's action, to achieve the control objective. This work utilizes actuator designs developed by the co-PIs that produce the disturbances dictated by optimal perturbation theory in an effective manner. This study will also produce fundamental knowledge about compressible flows that is broadly applicable and develop analysis tools and control methods. Successful completion of the proposed research can have an impact on related problems in aerospace, energy, automotive and other applications where flow/noise control is important. The co-PIs propose to leverage their activities with K-12 outreach activities of the Florida Center for Advanced Aero-Propulsion (FCAAP), an FSU led multi-university, statewide Center of Excellence. The PIs are members of the College of Engineering jointly run by the Florida A&M University (an HBCU) and FSU, where the College has consistently been ranked as a top educator of African American engineers. Students engaged in this research and its outcomes will be from a culturally diverse student population. In addition, incorporation of research into teaching graduate courses is proposed.