CAREER: Towards Understanding and Control of Surface-Impinging Particle-Laden Flows

职业：理解和控制表面撞击的载有颗粒流

• 批准号: 2239393
• 负责人: Shyam Menon
• 金额: $ 53.41万
• 依托单位: Louisiana State University
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2022
• 资助国家: 美国
• 起止时间: 2022-12-15 至 2027-11-30
• 项目状态: 未结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=2239393&HistoricalAwards=false
• 关键词: CAREER; Towards; Understanding; Control; Surface

Gas flows laden with dispersed solid particles are generated in a variety of engineering applications where their interaction with material surfaces can lead to positive or negative outcomes. Positive outcomes include spray coatings and cold spray additive manufacturing, while negative outcomes include surface erosion and deposition affecting the performance of aircraft propulsion systems, wind turbines, and spacecraft in dusty atmospheres. Achieving control of the multiphase interaction process is limited by gaps in fundamental fluid dynamical understanding of momentum and energy transfer processes between the continuous gas phase and dispersed particles, which subsequently drives the interaction outcome between the particles and material surfaces. The PI will pursue an integrated research and education program to achieve three specific goals: 1) establish a connection between gas phase-influenced particle conditions and collision outcomes when the particles impact a solid surface, 2) use this connection to develop a control scheme to mitigate surface damage utilizing fluidic injection into the boundary layer, and 3) advance aerospace education through implementation of hands-on rocketry and aerodynamics courses for undergraduate and high-school students as well as a traveling exhibit on shockwave propagation aimed at the general public.The overall goal of this work is to address knowledge gaps pertaining to the critical role played by fluid dynamics in influencing surface impingement processes by particle-laden gas flows. Impulsively-accelerated single particles will be studied at controlled conditions in a shock tube setup, wherein, particle motion and temperature measurements will be used to study unsteady particle drag and heat transfer, and evaluate existing models for the same. Ultra-high-speed imaging of particle impact with a solid surface will be used to map collision outcomes to a regime map characterized by non-dimensional temperature and kinetic energy. Validation of the regime map and attempts to control surface damage through fluidic injection in the surface boundary layer will be pursued in a multiphase hot cascade setup generating continuous, particle-laden flow over an airfoil surface. The research program will serve as a platform for aerospace education through outreach activities including: a laboratory component on hybrid rockets incorporated into an undergraduate propulsion course, a mini-course on aerodynamics and propulsion for K-8 students, a middle-school summer research mentorship program, and an interactive shock wave demonstration incorporated into a traveling exhibit that visits schools and state fairs to further science education.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.

充满分散固体颗粒的气流在各种工程应用中产生，它们与材料表面的相互作用可能导致积极或消极的结果。积极的结果包括喷涂和冷喷涂增材制造，而消极的结果包括表面侵蚀和沉积，影响飞机推进系统、风力涡轮机和航天器在多尘大气中的性能。实现多相相互作用过程的控制受到对连续气相和分散颗粒之间动量和能量传递过程的基本流体动力学理解的差距的限制，这随后驱动了颗粒和材料表面之间的相互作用结果。 PI 将开展综合研究和教育计划，以实现三个具体目标：1）在受气相影响的颗粒条件与颗粒撞击固体表面时的碰撞结果之间建立联系，2）利用这种联系开发控制方案通过向边界层注入流体来减轻表面损伤，3）通过为本科生和高中生实施火箭技术和空气动力学实践课程以及针对公众的冲击波传播巡回展览来推进航空航天教育。这项工作的总体目标旨在解决与流体动力学在影响载有颗粒的气流的表面冲击过程中所发挥的关键作用有关的知识差距。将在激波管装置中的受控条件下研究脉冲加速的单个粒子，其中粒子运动和温度测量将用于研究非稳态粒子阻力和传热，并评估现有模型。粒子与固体表面碰撞的超高速成像将用于将碰撞结果映射到以无量纲温度和动能为特征的状态图。流态图的验证以及通过表面边界层中的流体注入来控制表面损伤的尝试将在多相热级联装置中进行，该装置在翼型表面上产生连续的、充满颗粒的流。该研究计划将通过外展活动作为航空航天教育的平台，包括：纳入本科生推进课程的混合火箭实验室部分、为 K-8 学生开设的空气动力学和推进迷你课程、中学暑期研究指导该奖项反映了 NSF 的法定使命，并通过使用基金会的智力价值和更广泛的影响审查标准进行评估，被认为值得支持。