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Elucidation and Modeling of Turbulent Premixed Combustion Phenomena in a High-Pressure and High-Temperature Environment

高压高温环境中湍流预混燃烧现象的阐明和建模

基本信息

批准号：
12450080
负责人：
KOBAYASHI Hideaki
金额：
$ 9.09万
依托单位：
Tohoku 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

来源：
https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-12450080/
关键词：
HighrPressure Combustion Preheated Air Turbulent Burning Velocity PLIF Turbulence Spectrum Fractal Turbulence Scales Laminar Burning Velocity 乱流燃焼

项目摘要

This research aimed to explore turbulent combustion phenomena at high pressure and high temperature. Turbulent premixed flames for preheated mixture stabilized in a high-pressure chamber were investigated. Precise observations of the flame and measurement of turbulent burning velocity and the smallest scales of flame wrinkling due to Darrieus-Landau hydrodynamic instability were performed. Effects of pressure and preheating were examined and the turbulent combustion model at high pressure and high temperature was developed.Electrical heater of the air was developed and installed in the high-pressure chamber for the present experiment. The maximum pressure and temperature were 1.0 MPa and 573 K because of the limitation of high-temperature seals. Methane/air mixtures were used for the experiments. The fractal inner cutoff of OH-PLIF images as the smallest scale of flame wrinkles was analyzed, and it was clarified that the significant correlation between the smallest wrinkling scale and … More characteristic scale of Darrieus-Landau hydrodynamic instability even at 573 K for large turbulence Reynolds number. Precise measurement of the energy spectrum of turbulence showed that Kolmogorov's similarity law for nondimensional energy spectrums of flow turbulence at high pressure and high temperature was confirmed, and a characteristic scale equivalent to the average vortex-tube diameter, which is about 10 times larger than the Kolmogorov scale can be considered as a scale corresponding to the largest wavenumber of initial flow disturbances. It was also shown that the smallest wrinkling scale becomes constant when this turbulence scale becomes smaller than the instability scale because of the effect of the Darrieus-Landau hydrodynamic instability. Measurements of laminar burning velocity at high-pressure and high-temperature were performed using simultaneous PIV and OH-PLIF methods developed in this research. Experiments for stoichiometric H2/O2/He mixture were performed first and then methane/air mixture was examined. Modification of the reaction mechanism was also performed. The numerical and experimental data were used for the analysis of the turbulent combustion.Finally, measurements of turbulent burning velocity based on image processing of OH-PLIF images were conducted and the model to estimate turbulent burning velocity at high-pressure and high-temperature based on turbulent Reynolds number was developed. Less

本研究旨在探讨高温高压下的紊流燃烧现象。研究了在高压燃烧室中稳定预热混合气的湍流预混火焰。火焰的精确观测和湍流燃烧速度的测量和最小尺度的火焰湍流由于Darrieus-Landau流体动力学不稳定性进行。研究了压力和预热对燃烧的影响，建立了高温高压下的湍流燃烧模型，并在高压燃烧室内安装了空气电加热器。由于高温密封的限制，最高压力和温度分别为1.0 MPa和573 K。甲烷/空气混合物用于实验。分析了OH-PLIF图像的分形内截止作为火焰褶皱的最小尺度，阐明了火焰褶皱的最小尺度与OH-PLIF图像的分形内截止之间的显著相关性。 ...更多信息 Darrieus-Landau流体动力学不稳定性的特征尺度，即使在573 K的大湍流雷诺数。对湍流能谱的精确测量表明，高温高压下湍流无量纲能谱的Kolmogorov相似律得到了证实，与平均涡管直径相当的一个特征尺度（约为Kolmogorov尺度的10倍）可被认为是初始扰动最大波数所对应的尺度。当湍流尺度小于不稳定尺度时，由于Darrieus-Landau流体动力不稳定性的影响，最小湍流尺度变为常数。采用PIV和OH-PLIF同步测量技术对高温高压下的层流燃烧速度进行了测量。首先进行了化学计量的H2/O2/He混合物的实验，然后检查甲烷/空气混合物。对反应机理进行了改进。最后，基于OH-PLIF图像处理技术对湍流燃烧速度进行了测量，建立了基于湍流雷诺数的高温高压湍流燃烧速度估算模型。少