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THREE DIMENSIONAL SPATIAL CORRELATION OF TEMPERATURE AND VELOCITY IN TUBULENT DIFFUSION FLAME

管状扩散火焰中温度与速度的三维空间相关性

基本信息

批准号：
10650217
负责人：
UEKI Hironobu
金额：
$ 2.24万
依托单位：
NAGASAKI UNIVERSITY
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
1998
资助国家：
日本
起止时间：
1998 至 1999
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-10650217/
关键词：
DIFFUSION FLAME TURBULENT FLOW FLAME TEMPERATURE OPTICAL FIBER THERMOMETER LASER 2-FOCUS VELOCIMETER SPATIAL CORRELATION OF TURBULANCE CROSS CORRELATION OF VELOCITY AND TEMPERATURE 拡散火災火災温度

项目摘要

Turbulent diffusion flame is widely used in industries. In order to preserve World-wide environment, stable and high speed combustion with low emission is needed. In this research work, flame temperature and gas velocity were measured simultaneously by the system utilizing opto-electronic devices, and three dimensional spatial correlation of turbulence was analyzed for understanding the structure of turbulent diffusion flame.1. Accurate analysis of turbulence spectrum: Two sets of the optical fiber thermometer (OFT) based on the two-color method and two sets of the semiconductor laser 2-focus velocimeter (L2F) were operated simultaneously and these were integrated by a personal computer. Velocity data with non-uniform time interval obtained by L2F were reconstructed by the Karman filter and the correlation-based slotting technique was used for estimating the auto-correlation of turbulence. It was made clear that accurate spectrum could be obtained by the proposed method.2. Spatial corr … More elation of temperature and velocity: The spatial correlation of turbulence of flame temperature and that of gas velocity were obtained accurately by the expanded correlation-based slotting technique. The contour of the temporal- and spatial- correlation of turbulence in a free jet could be related to the mean gas velocity. And, judging from the auto-correlation and spatial correlation of temperature, small thermal eddies of combusting gas seemed to be transferred by the time avenged gas flow to the downstream. Further, the spectrum analysis based on the conditional sampling of the measured temperature and velocity would give an information about temporal- and spatial- correlation of the intermittent combustion region.3. Measurement of near-field structure of jet diffusion flame: The air was supplied to the outer edge of a jet diffusion flame of propane for the formation of a co-axial flame. In case of the lift-of flame, the entrainment was lager than that of the normal flame, and this seemed to lead the increment of entrainment to the hole flame region. Further, from the measurement of flame temperature and soot concentration, it could be deduced that the validity of luminous flame could have some relation to the entrainment of surrounding air. The low validity of luminous flame could be correlated to the reduction of soot concentration in case of the lift-off flame. Less

湍流扩散火焰在工业中有着广泛的应用。为了保护全球环境，需要稳定、高速、低排放的燃烧。本研究利用光电装置同时测量火焰温度和气体速度，并分析湍流的三维空间相关性，以了解湍流扩散火焰的结构.湍流谱的精确分析：两套基于双色法的光纤温度计（OFT）和两套半导体激光双焦点速度计（L2F）同时工作，并由个人计算机集成。采用卡尔曼滤波器对L2F获得的非均匀时间间隔的速度数据进行重构，并采用基于相关的开槽技术估计湍流的自相关。结果表明，该方法可以获得准确的光谱.空间相关 ...更多信息温度和速度的空间相关性：采用基于扩展相关性的开槽技术，准确地获得了火焰温度和气体速度的空间相关性。自由射流中湍流的时间和空间相关性的轮廓可以与平均气体速度有关。从温度的自相关性和空间相关性来看，燃烧气体的小热涡似乎是通过时间复仇气流向下游传递的。此外，基于测量温度和速度的条件采样的频谱分析将给出间歇燃烧区域的时间和空间相关性的信息.射流扩散火焰近场结构的测量：在丙烷射流扩散火焰的外缘通入空气，形成同轴火焰。在火焰提升的情况下，卷吸量比正常火焰的卷吸量要大，这似乎导致了向孔火焰区域卷吸量的增加。此外，从火焰温度和烟尘浓度的测量可以推断，发光火焰的有效性可能与周围空气的卷吸有关。发光火焰的有效性较低可能与在抬离火焰的情况下碳烟浓度的降低有关。少