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

摘要Mungal CTS-9530957 PI建议提供新的实验数据的影响，获得明确的同向流动，非预混，湍流射流火焰的热释放。 同时测量使用基于激光的粒子图像测速技术（PIV），平面激光诱导荧光（PLIF）的建议。 从这些测量的详细信息的瞬时速度，从而应变率和涡度场，温度分布和一个保守的标量及其梯度将获得的程度的热释放是不同的。 PI打算使用氢气或用氦气（可能还有氮气）稀释的甲烷作为燃料混合物，并通过改变燃料混合物中氢气/甲烷的比例来改变热释放。 预计在大多数运行条件下，快速化学反应将占主导地位，雷诺数将在2，000至超过20，000的范围内变化。 PI还将寻求保持实验和建模要求之间的密切关系。 为此，PI计划使用J. E。布罗德韦尔作为模型开发的顾问，并帮助指导实验方案的方向。 除了描述与热释放相关的流场变化外，拟议的研究还寻求alqo为建模者提供以下信息：通过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、夹带和空气路径以及尺度分布。

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.