UNS: Collaborative Research: Spectral Energy Transfer in Turbulent Flames: From its Characterization to Subgrid Scale Models

UNS：合作研究：湍流火焰中的光谱能量转移：从其表征到亚网格尺度模型

• 批准号: 1512214
• 负责人: Fokion Egolfopoulos
• 金额: $ 17.7万
• 依托单位: University of Southern California
• 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: 2015-07-01 至 2018-06-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1512214&HistoricalAwards=false
• 关键词: UNS; Collaborative; Research; Spectral; Energy

1512214 / Egolfopoulos, Fokion N.1512771 / Blanquart, GuillaumeThe principal investigators propose to investigate how fluid flows (typical in devices such as combustor in engines and power plants) can be better modelled by using the state-of-art computer simulation techniques with the help of advanced laser-based measurements. The potential benefits of the study include better understanding and design of combustors and higher efficiency and lower pollutant emissions. Both graduate and undergraduate students will be involved in the research and be prepared as future researchers and engineers. This proposal focuses on fundamental investigation of the effects of heat release on small scale turbulent structure and aims to provide insight and mechanisms for developing physics-based turbulent reacting models, rather than based on ad-hoc assumptions. The experimental components include novel velocity measurements, adopting an approach similar to tomography in that the velocity measurements cover the depth of the field instead of the traditional two-dimensional section in truly three-dimensional flows. Some insight will also be shed on whether Kolmogorov's equilibrium assumption for turbulent kinetic energy cascade is valid and, if not, to what extent and in what manner the assumption should be modified by the heat-releasing reactions. The measurements span over a broader dynamic range of scales than is normally addressed using PIV. The proposed direct numerical simulations (DNS) and analysis are well focused on questions of the effects of heat release on turbulent energy spectra and energy transfer between different scales.

1512214 / Egolfopoulos，Fokion N.1512771 /Blanquet，Guillaume主要研究人员建议研究如何通过使用先进的计算机模拟技术，并借助先进的基于激光的测量，更好地模拟流体流动（典型的设备，如发动机和发电厂的燃烧室）。 这项研究的潜在好处包括更好地理解和设计燃烧室，提高效率和减少污染物排放。研究生和本科生都将参与研究，并为未来的研究人员和工程师做好准备。该建议侧重于对小尺度湍流结构的热释放的影响的基本调查，旨在为开发基于物理的湍流反应模型提供见解和机制，而不是基于特设的假设。实验组件包括新的速度测量，采用类似于层析成像的方法，速度测量覆盖的领域，而不是传统的二维部分，在真正的三维流的深度。 还将阐明Kolmogorov的湍流动能级联的平衡假设是否有效，如果不有效，在何种程度上和以何种方式的假设应修改的放热反应。 测量跨越了一个更广泛的动态范围的规模比通常使用PIV解决。 建议的直接数值模拟（DNS）和分析是很好地集中在问题的热释放的湍流能量谱和不同尺度之间的能量传递的影响。