Investigation of the Elementary Process in Turbulent Combustion

湍流燃烧基本过程的研究

基本信息

批准号：
12450088
负责人：
TAKAGI Toshimi
金额：
$ 9.6万
依托单位：
Osaka University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
2000
资助国家：
日本
起止时间：
2000 至 2001
项目状态：
已结题

项目摘要

The turbulent diffusion flame is supposed to be an ensemble of the laminar flamelets which should be strained unsteadily and have positive or negative curvature, and be affected by preferential diffusion. In this study, experimental flame visualization and quantitative detection of temperature and OH concentration were conducted by use of the two-dimensional time-dependent laser Rayleigh scattering and OH laser induced fluorescence methods. Numerical studies were also conducted taking into account detailed chemical kinetics and multi component diffusion to predicted the characteristics of the experimental evidence and revealed the processes dominating the transient behavior of the flame with respect to the flame curvature and flame stretch. Attentions were paid to the effects of the flame stretch, flame curvature, preferential diffusion, unsteadiness and locality of the stretch on the flame temperature and flame extinction.(1) Flames with a controlled steady and unsteady strain were fo … More rmed to investigate the effects of positive and negative strain, flame curvature and unsteadiness on the flame temperature and local extinction by use of the two dimensional temperature detection by Rayleigh scattering.(2) Flames interacted with large scale vortices were formed by acoustic excitation to the fuel flow to investigated the interaction between flame and vortex by the detection of the OH concentration by the laser induced fluorescence together with and temperature detection by Rayleigh scattering paying attention to the local extinction due to the interaction.(3) Numerical simulation was conducted of the flames noted above taking into account multi component diffusion and the detailed chemical dynamics to make clear the interaction of the flame and the fluid dynamics. The large stretch which should induce the local quenching does not necessarily induce the flame quenching due to the unsteadiness and locality. It is also pointed out that the flame extinction is induced by the defect of the fuel or oxidizer interacted with the vortex. Less

预计湍流扩散火焰将是层状火焰的合奏，应不稳定地应紧张并具有正曲率或负曲率，并受到首选扩散的影响。在这项研究中，通过使用二维时间依赖性激光雷利散射和OH激光诱导的荧光方法进行了实验火焰可视化和温度和OH浓度的定量检测。还考虑了详细的化学动力学和多组分差异，以预测实验证据的特征，并揭示了在火焰曲率和火焰伸展方面主导着占主导地位的瞬态行为的过程。对火焰拉伸，火焰曲率，首选扩散，不稳定和局部性对火焰温度和火焰扩展的影响表示敬意。（1）火焰稳定且不稳定的菌株的火焰更为fo fo…更加宽松地……通过使用正面和不稳定的温度来调查，以调查两种态度，火焰弯曲和不稳定的效果，火焰曲率和局部性，火焰弯曲和不稳定性，火焰曲率和局部性，火焰曲率和局部性，火焰弯曲和局部性，火焰弯曲和局部性的效果。（2）通过对燃料流量的刺激来形成与大规模涡流相互作用的火焰，从而形成了燃料流量，从而通过激光通过激光诱导的荧光和温度检测和温度检测来调查火焰和涡流之间的相互作用，并通过rayleigh散射到相互作用的范围内，而散布了范围的范围。详细的化学动力学可以清除火焰和流体动力学的相互作用。应诱发局部淬火的大拉伸不一定会由于不稳定和所在地而引起火焰淬火。还指出，火焰延伸是由与涡流相互作用的燃料或氧化剂的缺陷引起的。较少的