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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湍流燃烧现象。对高压室内稳定预热混合气的湍流预混火焰进行了研究。对火焰进行了精确的观测，测量了湍流燃烧速度和由于Darrieus-Landau流体动力不稳定性而产生的最小尺度的火焰起皱。考察了压力和预热的影响，建立了高温高压下的湍流燃烧模型。本实验研制了空气电加热器并安装在高压室内。由于高温密封的局限性，最大压力和最高温度分别为1.0 Mpa和573K。实验中使用了甲烷/空气混合物。分析了作为火焰皱纹最小尺度的OH-PLIF图像的分维内界，阐明了最小皱纹尺度与…之间的显著相关性对于大的湍流雷诺数，即使在573K，Darrieus-Landau流体动力不稳定性的特征尺度也更大。对湍流能谱的精确测量表明，Kolmogorov相似定律对于高温高压下流动湍流的无量纲能谱是成立的，相当于涡管平均直径的特征尺度比Kolmogorov尺度大约10倍，可认为是与初始流动扰动的最大波数相对应的尺度。由于Darrieus-Landau流体动力不稳定性的影响，当湍流尺度小于不稳定尺度时，最小起皱尺度变得恒定。利用本研究开发的同步PIV和OH-PLIF方法对高温高压层流燃烧速度进行了测量。首先对化学计量比的H2/O2/He混合气体进行了实验，然后对甲烷/空气混合物进行了测试。并对反应机理进行了修正。利用数值计算和实验数据对湍流燃烧过程进行了分析。最后，对OH-PLIF图像进行了图像处理，测量了湍流燃烧速度，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。较少