Experiments on Turbulence-Chemistry Interaction in Highly Turbulent Counterflow Flames

建议：1403433PI：Gomez，Alessandro职务：高湍流逆流火焰中湍流-化学相互作用的实验该提案的重点是了解在实际燃烧器（如发电厂和喷气发动机）中看到的火焰中如何发生能量转移。 通过使用所谓的逆流燃烧器建立的模型火焰，用于在大学实验室中进行研究，旨在将所获得的知识转化为实际的燃烧器系统。 先进的激光工具将与高速摄像机结合使用，以可视化常规摄像机和人眼看不到的现象，这对理解这些火焰具有重要意义。这项拟议中的研究与桑迪亚国家实验室和康奈尔大学合作，将对这些火焰进行计算机建模。 拟议的研究将集中在高度湍流逆流火焰跨尺度的能量传递的评估。 湍流动能在大尺度下产生，在广泛的尺度范围内以级联形式向下传递，并最终在最小尺度下耗散。 高度湍流的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点，例如：在高雷诺数下没有飞行员的火焰稳定;紧凑性，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状态，特别是那些与工业相关的燃烧状态。 我们的目标是量化这种能量转移和对比它在非反应的情况下，与反应对应物，在非预混和预混条件下。 一个过滤器空间技术将被应用到一个三维的速度测量。 在耶鲁大学进行初步测试以确定最有趣的火焰之后，大部分测量将在桑迪亚国家实验室进行，依靠新获得的高速成像设施，该设施将以高重复率同时提供断层PIV和平面激光诱导荧光测量。拟议的研究与桑迪亚和康奈尔大学的合作，在那里这些火焰的建模将被追求。 拟议的活动也有一个计算组件在康奈尔大学开发，使用这些实验数据进行验证。高质量的数据库，包括良好的特征边界条件，将在网络上提供给燃烧界，以在正在进行的国际合作的框架内进一步建模。

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.