U.S.-France Cooperative Research: Stagnation Flow Stabilized Premixed Turbulent Flames

该奖项将支持加州大学伯克利分校劳伦斯伯克利实验室的Robert K.Cheng博士与法国奥尔良CNRS燃烧与高温研究中心(CRCCHT)的I.Gokalp博士之间的合作研究。这项工作将集中于研究滞止点流动中稳定的预混湍流火焰的基本性质。这种特殊的火焰结构被认为是测试湍流燃烧的数值模型的理想选择，因为它的行为非常接近理想的一维火焰。将研究两种不同类型的火焰结构：在加利福尼亚州，由火焰撞击平板形成的平面湍流火焰刷子；在法国，相反的火焰喷嘴。法国和美国的研究小组在研究湍流火焰动力学方面都采用了相同的方法，使用激光诊断学来测量详细的统计湍流参数。拟议的合作将使可以使用这些技术研究的火焰配置的类型成倍增加。美国和法国的调查人员在过去两年里一直在非正式地合作，这种合作已经导致了两份联合出版物。这笔赠款提供的旅行支助将促进这项工作的继续，这项工作对利用火焰的高效设备的设计具有重要的实际意义，例如燃气或石油燃烧器。

This award will support collaborative research between Dr. Robert K. Cheng of the Lawrence Berkeley Laboratory of the University of California, Berkeley, and Dr. I. Gokalp of the Centre de Recherches sur la Chimie de la Combustion et des Hautes Temperatures (CRCCHT) of CNRS, in Orleans, France. The work will focus on an investigation of the fundamental properties of premixed turbulent flames stabilized in stagnation point flows. This particular flame configuration is considered ideal for testing numerical models of turbulent combustion, because its behavior closely approximates that of an idealized one-dimensional flame. Two different types of flame configurations will be studied: in California, the planar turbulent flame brush formed by the impinging of a flame on a flat plate; and in France, opposing flame jets. Both the French and American groups share the same approach to the study of turbulent flame dynamics, employing laser diagnostics to measure detailed statistical turbulence parameters. The proposed collaboration will multiply the number of types of flame configurations that can be studied using these techniques. The U.S. and French investigators have been collaborating informally for the last two years, and this collaboration has already resulted in two joint publications. Travel support provided by this grant will facilitate the continuation of this work, which has important practical ramifications in the design of high-efficiency apparatus, such as gas or oil burners, which utilize flames.