Turbulence/Premixed-Flame Interactions in Isotropic Turbulence

反应物物种的优先扩散对 火焰在湍流气体中的传播 燃料/氧化剂混合物将通过一系列 定容风扇搅拌燃烧实验 室。 速度场和湍流量将是 使用两点激光测速仪和粒子图像测量 速度测量和激光火焰断层扫描将用于 确定瞬时火焰表面。 氢/氧/氮混合物产生优先的 对火焰结构有稳定作用的扩散 将被选择以覆盖宽范围的层流火焰速度， 以及湍流强度和积分尺度 反应物将被独立地控制。 测试范围 将涉及薄层流小火焰区的湍流 雷诺数高达10，000。 火焰传播过程 将使用统计时间序列进行理论模拟 技术作为一种解释测量的方式，并作为一种 一种方法来启动一个计算上易处理的发展， 预测工具，其中包括一个合理的治疗 流动物理学 了解湍流和速度之间的相互作用 火焰传播到可燃混合物中的方式是 燃烧科学的基本问题。 的结果 研究将提供深入了解这个复杂的一个方面， 可能应用于内燃机的现象 发动机和湍流预混合燃烧过程 将军

The influence of preferential diffusion of reactant species on the propagation of a flame through a turbulent gaseous fuel/oxidizer mixture is to be studied by a series of experiments in a constant volume, fan-stirred combustion chamber. The velocity field and turbulence quantities will be measured using two-point laser velocimetry and particle-image velocimetry, and laser flame tomography will be used to determine the instantaneous flame surface. Hydrogen/oxygen/nitrogen mixtures producing preferential diffusion with a stabilizing influence on the flame structure will be chosen to cover a wide range of laminar flame speeds, and the turbulence intensity and integral scale of the reactants will be controlled independently. The test range will involve the thin laminar flamelet regime for turbulent Reynolds numbers up to 10,000. The flame propagation process will be simulated theoretically using statistical time-series techniques as a way to interpret the measurements, and as a way to initiate the development of a computationally tractable predictive tool which includes a rational treatment of the flow physics. Understanding the interaction between turbulence and the speed with which a flame propagates into a combustible mixture is a fundamental issue in combustion science. The results of this research will provide insight into one aspect of this complex phenomena, with applications possible to internal combustion engines and turbulent premixed combustion processes in general.