Simultaneous PIV and PLIF Studies of the Effect of Heat Release upon Chemically Reacting Jet Flows

摘要：Mungal CTS-9530957项目提出提供新的实验数据，研究在明确的共流动、非预混、湍流射流火焰中获得的放热效应。提出了基于激光的粒子图像测速（PIV）和平面激光诱导荧光（PLIF）技术的同步测量方法。从这些测量中，可以得到瞬时速度的详细信息，从而得到应变率和涡度场、温度分布和一个守恒标量及其梯度，随着热释放程度的变化。该项目打算使用氢气或甲烷稀释氦气（可能还有氮气）作为燃料混合物，并通过改变燃料混合物中氢气/甲烷的比例来改变热量释放。预计在大多数运行条件下，快速化学将占上风，雷诺数将在2000到20000以上的范围内变化。项目负责人还将设法保持实验和建模要求之间的密切关系。为此，PI计划聘请J. E. Broadwell博士作为模型开发的顾问，并帮助指导实验项目的方向。拟议的研究除了描述与热释放相关的流场变化外，还寻求为建模者提供以下信息：火焰刷的实际应变率，各种流体元素的停留时间，标量耗散率，空气的携带和路径以及尺度分布。

Abstract Mungal CTS-9530957 The PI proposes to provide new experimental data on the effects of heat release obtained on well defined co-flowing, nonpremixed, turbulent jet flames. Simultaneous measurements using the laser-based techniques of Particle Image Velocimetry (PIV), and Planar Laser Induced Fluorescence (PLIF) is proposed. From these measurements detailed information on the instantaneous velocities and therefore the strain rate and vorticity fields, the temperature distributions and a conserved scalar and its gradients will be obtained as the degree of heat release is varied. The PI intends to use either hydrogen or methane diluted with helium (and possibly nitrogen) as the fuel mixture and to vary the heat release by changing the proportion of hydrogen/methane in the fuel mixture. It is expected that fast chemistry will prevail for most of the run conditions and Reynolds numbers will be varied in the range of 2,000 to in excess of 20,000. The PI will also seek to maintain a close relationship between the experiments and modeling requirements. To this end the PI plans to use Dr. J. E. Broadwell as a consultant for the model development and to help guide the direction of the experimental program. The proposed research in addition to describing the changes to the flowfield associated with heat release seeks alqo to provide modelers with the following information: actual strain rates throughput the flame brush, residence times of various fluid elements, scalar dissipation rates, entrainment and paths of air, and scale distributions.