Experimental Studies on Flow/Flame and Flame/Flame Interactions

本研究的目的是通过实验模拟在湍流燃烧中遇到的火焰流相互作用，仔细控制，旋转层流火焰经历不同程度的拉伸。选择对向射流和驻点流动是因为它们具有可达性和二维性。温度、浓度和速度将在反应和非反应环境中进行测量，并将探索由旋转引起的二次流结构以及先前确定的共振现象。辅助实验将在利弗莫尔桑迪亚国家实验室的燃烧研究设施进行。在实际应用的装置中，燃烧总是涉及几何形状的湍流，这些几何形状无法对重要的尺度场和速度场进行时间测量。系统性能的数值预测需要对局部湍流结构内火焰淬火和传播过程的理解。通过提出的简单实验成功模拟这一复杂现象将大大有助于我们的理解。

The objective of the research is to experimentally simulate the flame- flow interactions encountered in turbulent combustion with a carefully controlled, rotating laminar flame undergoing various degrees of stretch. Opposed jet and stagnation point flows have been chosen because of their accessibility and two-dimensionality. Temperature, concentration, and velocity will be measured in reacting and unreacting environments, and the structure of secondary flows induced by rotation as well as resonance phenomena previously identified will be explored. Supporting experiments will be performed at the Combustion Research Facility of the Sandia National Laboratory, Livermore. Combustion in devices of practical application invariably involves turbulent flow in geometries not amenable to temporal measurement of the important scaler and velocity fields. Numerical predictions of the system performance require an understanding of the flame quenching and propagation processes that occur within the localized turbulent structures. Successful simulation of this complex phenomena through the proposed simple experiments will substantially contribute to our understanding.