GOALI: Prediction and Mitigation of Undesirable Acoustic Phenomena in Combustors and Power Generation Systems

该项目旨在创建方法来提高大型燃烧器和发电系统的安全性，性能和稳定性。将采取一种统一的方法，对航空航天和发电行业都产生重大影响。例如，理解和抑制燃烧室中出现的不稳定性将有助于推进混合燃烧技术及其在空间和陆地应用中作为安全和清洁推进替代品的用途。 因此，这种方法将有助于大型燃烧室和化学火箭的发展，从而提高该国的国防能力。更稳定的推进概念的进步将改变我们国家的发射基础设施，大大降低太空探索，太空旅游，卫星部署和武器开发的成本。 更广泛的影响包括培训几名研究生，提供专业课程，广泛传播研究成果，以及与工业伙伴分享第一手知识和经验。此外，该项目将通过战略规划的短期课程，暑期培训，技术交流和竞争性设计挑战，让高中生接触声学噪声控制和火箭推进的现代研究概念，从而加强STEM教育工作。火箭发动机的声稳定性框架将提供一种诊断工具，以量化大型燃烧室中的声振荡行为。 这种方法也可以从固体和混合发动机扩展到液体火箭、冲压发动机、预燃室、加力燃烧室和燃气涡轮机发动机。 有了基于物理学的框架，未来寻求更高性能的燃烧室将有可能更有效地运行，更接近其稳定性极限。 该计划将寻求获得更现实的平均和非定常流动模型的固体和混合火箭与任意几何配置，空间敏感的颗粒回归率方程的混合动力，和一个triglobal稳定性制定捕捉放大声振荡和压力跳跃。 该项目还将培训若干研究生和本科生，编写关于建造更安全和更稳定的火箭的技术指南，并开设两门关于航空声学和混合火箭学的现代课程。最后，与工业赞助商空间推进集团的伙伴关系将有利于火星上升飞行器的开发，该飞行器目前正在由NASA开发。该奖项反映了NSF的法定使命，并通过使用基金会的知识价值和更广泛的影响审查标准进行评估，被认为值得支持。

This Grant Opportunities for Academic Liaison with Industry (GOALI) project aims at creating methods to improve the safety, performance, and stability of large combustors and power generation systems. A unifying approach will be pursued that can have a significant impact on both the aerospace and power generation industries. For example, understanding and suppressing instabilities that arise in combustors will aid in advancing hybrid combustion technology and its use as a safe and clean propulsion alternative in both space and land applications. This methodology will therefore help in the advancement of large combustors and chemical rockets and thereby advance the country's defense capabilities. The advancement of more stable propulsion concepts will transform our nation's launch infrastructure with drastically reduced costs in space exploration, space tourism, satellite deployment, and weaponry development. The broader impacts include training of several graduate students, offering of specialized courses, broad dissemination of research outcomes, as well as the sharing of first-hand knowledge and experience with industrial partners. Furthermore, the project will enhance STEM education efforts by exposing high school students to modern research concepts in acoustic noise control and rocket propulsion through strategically planned short courses, summer training, technical exchanges, and competitive design challenges.The development of a unified, physics-based, acoustic stability framework for rocket motors will provide a diagnostic tool to quantify the behavior of acoustic oscillations in large combustors. This methodology can also be extended from solid and hybrid motors to liquid rockets, ramjets, preburners, augmenters, and gas turbine engines. With the physics-based framework in hand, it will be possible for future combustors seeking higher performance to be operated more efficiently and closer to their stability limits. The program will seek to obtain more realistic mean and unsteady flow models for solid and hybrid rockets with arbitrary geometric configurations, spatially sensitive grain regression rate equations for hybrids, and a triglobal stability formulation to capture the amplified acoustic oscillations and pressure jumps. It will also lead to the training of several graduate and undergraduate students, a technical guide for building safer and more stable rockets, and two modern courses on aeroacoustics and hybrid rocketry. Finally, partnership with the industrial sponsor, the Space Propulsion Group, will benefit the development of the Mars Ascent Vehicle, which is presently under development by NASA.This award reflects NSF's statutory mission and has been deemed worthy of support through evaluation using the Foundation's intellectual merit and broader impacts review criteria.