CAREER: Application-Driven Combustion and Fluid Flow Imaging

莱斯特·苏，约翰·霍普金斯大学机械工程系，主要从事平面激光成像技术的发展和应用，用于研究燃烧和湍流流体流动问题。它特别关注分子混合，着眼于在非预混湍流燃烧模拟中使用的模型的严格实验评估。平面成像方法能够直接可视化湍流结构，因此本质上非常适合于评估模拟方法（如大涡模拟），这些方法在概念上植根于湍流的结构组织。这项工作包括基于标量场测量的气相湍流测速技术的发展，该技术可以应用于混合和燃烧模型的先验测试，以及使用瑞利散射和平面激光诱导荧光方法来研究多物种湍流混合问题中的微分分子扩散。该研究项目的结果将有助于提高效率，减少燃烧系统对环境的影响，通过提高对潜在湍流混合过程的理解，促进更准确的模拟方法的发展。在可预见的未来，化石燃料的燃烧仍将是工业经济的重要组成部分，高效、清洁的燃烧对可持续发展至关重要。在这项工作的过程中，PI还解决了大学工程系入学人数停滞的问题。正在开发新的课程，以使工程教育反映工程实践的当前趋势，并以一种认识到不同代表性不足的群体所面临的不同障碍的方式解决工程多样性问题。

CAREER: Application-driven Combustion and Fluid Flow Imaging, CTS-0348208Lester K. Su, Department of Mechanical Engineering, Johns Hopkins UniversityAbstractThis work encompasses the development and application of planar laser imaging techniques for investigating problems in combustion and turbulent fluid flows. It pays particular attention to molecular mixing, with an eye to rigorous experimental assessment of models used in simulations of non-premixed, turbulent combustion. Planar imaging methods are capable of direct visualization of turbulent flow structures and are thus inherently well suited for assessing simulation methods (such as large-eddy simulation) that are rooted conceptually in the structural organization of turbulent flows. This work includes the development of a velocimetry technique for gas-phase turbulent flows that is based on scalar field measurements, which can be applied in a priori testing of mixing and combustion models, and the use of Rayleigh scattering and planar laser-induced fluorescence methods to investigate differential molecular diffusion in multi-species turbulent mixing problems.The results of this research program will contribute to increased efficiency and reduced environmental impact of combustion systems by improving the understanding of the underlying turbulent mixing process and facilitating the development of more accurate simulation methods. Combustion of fossil fuels will remain significant to the industrial economy for the foreseeable future, and efficient and clean combustion is crucial for sustainable development. In the course of this work, the PI also addresses the issue of stagnant enrollments in university engineering departments. New courses are being developed to make engineering education reflect current trends in engineering practice, and the issue of diversity in engineering is addressed in a way that recognizes the different obstacles faced by different under-represented groups.