Experiments on Turbulence-Chemistry Interaction in Highly Turbulent Counterflow Flames

建议：1403433PI：Gomez，Alessandro标题：关于高度湍流逆流火焰中的湍流-化学相互作用的实验该建议的重点是了解在发电厂和喷气发动机等实际燃烧器中如何在火焰中发生能量传递。利用所谓的逆流燃烧器建立的模型火焰，用于大学实验室的研究，目的是将所获得的知识转化为实际的燃烧器系统。先进的基于激光的工具将与高速相机结合使用，以可视化常规相机和人眼无法看到的现象，这些现象对理解这些火焰具有重要意义。这项拟议的研究利用了与桑迪亚国家实验室和康奈尔大学的合作，在那里将对这些火焰进行计算机建模。拟议的研究将集中于评估高度湍流逆流火焰中的跨尺度能量传递。湍动能在大尺度上产生，在大范围内以串级方式向下传递，最终在最小尺度上消散。高湍动逆流火焰将被用作这类系统实验的基准配置。它们提供了显著的优势，例如：在高雷诺数下无需飞行员即可稳定火焰；紧凑，对于高分辨率计算具有显著优势；以及多功能性，能够访问广泛的燃烧模式，特别是与工业相关的燃烧模式。我们的目标是量化这种能量传递，并将其在非反应情况下和在非预混合和预混合条件下的反应对应物进行比较。滤波空间技术将应用于一组三维速度测量。在耶鲁大学进行初步测试以识别最有趣的火焰后，大部分测量将在桑迪亚国家实验室进行，依靠新收购的高速成像设备，该设备将以高重复频率同时提供断层PIV和平面激光诱导荧光测量。这项拟议的研究利用了与桑迪亚和康奈尔大学的合作，在那里将继续对这些火焰进行建模。提议的活动还包括康奈尔大学开发的一个计算组件，该组件使用这些实验数据进行了验证。高质量的数据库，包括特征明确的边界条件，将在网上向燃烧界提供，以便在正在进行的国际合作框架内进行进一步建模。

Proposal: 1403433PI: Gomez, AlessandroTitle: Experiments on Turbulence-Chemistry Interaction in Highly Turbulent Counterflow FlamesThe proposal focuses on understanding how energy transfers occur in flames that are seen in practical burners such as power plants and jet engines. A model flame, established by using the so-called counterflow burner, serves the purpose for investigation in a university laboratory, aiming to translate the knowledge gained into practical burner systems. Advanced laser-based tools will be used in conjunction with a high-speed camera to visualize phenomena that are not seen by regular cameras and human eyes and that are of significance for understanding these flames. The proposed research is leveraged with collaborations with Sandia National Laboratory and Cornell University, where computer modeling of these flames will be pursued. The proposed study will focus on the assessment of the energy transfer across scales in highly turbulent counter-flow flames. Turbulent kinetic energy is generated at large scales, transferred down in a cascade over a broad range of scales and eventually dissipated at the smallest scale. Highly turbulent counter-flow flames will be used as a benchmark configuration for this type of systematic experimentation. They offer significant advantages, such as: flame stabilization without a pilot at high Reynolds numbers; compactness, with significant advantages for highly resolved computations; and versatility, with the ability to access a broad range of combustion regimes, especially those of industrial relevance. The objective is to quantify this energy transfer and contrast it in the non-reacting case with the reacting counterparts, under both non-premixed and premixed conditions. A filter-space technique will be applied to a three-dimensional set of velocity measurements. After initial tests at Yale to identify the most interesting flames, the bulk of the measurements will be performed at Sandia National Laboratories by relying on a newly acquired facility for high-speed imaging that will provide simultaneous tomographic PIV and planar laser-induced fluorescence measurements at high repetition rates. The proposed research is leveraged with collaborations with Sandia and Cornell University, where modeling of these flames will be pursued. The proposed activity also has a computational component developed at Cornell that is validated using these experimental data. The high quality database, including well-characterized boundary conditions, will be made available on the web to the combustion community for further modeling within the framework of ongoing international collaborations.