GOALI: Response of Premixed Swirling Flames to Transverse Acoustic Excitation

燃烧不稳定性已经成为发电、飞机发动机和其他工业加热应用的清洁燃烧系统开发中的最大挑战。这些不稳定性会对发动机硬件造成严重损害，降低发动机的可操作性，并增加有害污染物的产生。了解火焰对声学振荡的反应是一个关键但知之甚少的问题，是不稳定的根源，也是这项工作的重点。这项工作将利用最先进的高速激光诊断技术来探测振荡燃烧过程中的非定常流动和火焰，并将这些结果与预测模型进行比较。该项目将直接支持一名研究生，同时还将利用其他资金支持更多的项目参与者，包括本科生和一名暑期高中教师。该计划的结构是研究、教育和服务同时进行。例如，PI将为研究生组织机会，在高中课堂上展示他们的研究成果，并解释科学和数学令人兴奋的应用。这项计划鼓励高中生追求科学事业，并为研究生提供教学经验和社区接触。从这项工作中获得的知识将有助于更好地理解燃烧流动的非定常流体力学，以及这些设备中的火焰如何对声激励做出反应。反过来，这些基础知识将使设计出坚固、持久、低排放的能源系统成为可能。这项工作得到了其行业合作伙伴的大力支持和资金支持。合作的结构是这样的，NSF计划将用于开发关键火焰和流动过程的诊断工具、分析方法和物理结构。工业合作伙伴和PI将在一个并行计划中合作，将这些诊断技术、分析方法和物理洞察应用到实际的低排放硬件中。

Combustion instabilities have emerged as the single largest challenge in the development of clean combustion systems for power generation, aircraft engines, and other industrial heating applications. These instabilities cause significant damage to engine hardware, reduce engine operability, and increase production of harmful pollutants. Understanding how flame's respond to acoustic oscillations is a critical, but poorly understood, problem at the root of the instabilities and the focus of this work. This work will utilize state of the art, high speed laser diagnostics to probe the unsteady flow and flame during oscillatory combustion and compare these results to predictive models. The project will directly support one graduate student, while also leveraging other funds to support additional project participants, including undergraduate students and a summer high school teacher. The program has been structured such that research, education, and service are simultaneously performed. For example, the PI will organize opportunities for graduate students to present their research to high school classes and explain the exciting applications of science and mathematics. This program encourages high school students to pursue careers in science and provides the graduate students with teaching experience and community exposure.The knowledge gained from this work will lead to improved understanding of the unsteady fluid mechanics of combusting flows, and how the flames in these devices respond to acoustic excitation. In turn, this fundamental knowledge will enable the design of robust, long lasting energy systems that are low emissions. This work has the strong endorsement and financial support from its industrial partner. The collaboration is structured such that the NSF program will be used to develop diagnostic tools, analysis approaches, and physical constructs for key flame and flow processes. The industrial partner and the PI will work in a parallel program to apply these diagnostic techniques, analysis approaches, and physical insight to actual low emissions hardware.