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

UNS：一种基于复杂流最优增长扰动探索控制策略的协作方法

• 批准号: 1510919
• 负责人: Farrukh Alvi
• 金额: $ 32.38万
• 依托单位: Florida State University
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2015
• 资助国家: 美国
• 起止时间: 2015-09-15 至 2019-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1510919&HistoricalAwards=false
• 关键词: UNS; Collaborative; Approach; Exploring; Control

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.

航空运输是一个将其对环境的影响降至最低的领域，包括发动机效率和喷气发动机噪音排放的减少，将使增长成为可能。这一提议的目的是利用一套计算和实验技术来研究并最终控制喷嘴中的喷射噪声。研究的领域是交通，这是一个国家利益的领域。这是一项建议，研究喷流的相关基本物理，然后开发适当的主动控制方法来降低喷流的噪声。联合PI建议使用双/相关执行器来进行流量控制。第一组将位于喷嘴出口的上游，执行器的操作参数将由最优摄动理论预测来指导，并将在边界层中引入干扰，以优先放大，产生有组织的结构。预计最佳激发的相干结构将是高能量的，以牺牲其他不稳定模式为代价；因此，它们将构成第二个激励器组的明确目标(通常不是喷流剪切层中的宽带湍流)。靠近高度可接受的喷嘴出口的第二致动器组将以与第一致动器的动作相关的方式进一步操纵组织的结构，以实现控制目标。这项工作利用由合作PI开发的执行器设计，以有效的方式产生由最优扰动理论指示的扰动。这项研究还将产生关于广泛适用的可压缩流动的基本知识，并开发分析工具和控制方法。成功完成拟议的研究将对航空航天、能源、汽车和其他流量/噪声控制非常重要的应用领域的相关问题产生影响。联合PI建议利用他们在佛罗里达高级航空推进中心(FCAAP)的K-12外联活动中的活动，FCAAP是FSU领导的多所大学、全州范围的英才中心。PI是由佛罗里达农工大学(HBCU)和佛罗里达州立大学(FSU)联合运营的工程学院的成员，该学院一直被评为非洲裔美国工程师的顶尖教育者。参与这项研究的学生及其结果将来自不同文化背景的学生群体。此外，还建议将研究融入研究生课程的教学中。