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

这项针对高温和高压室的torbulity coldustiona被视为稳定的。开发并安装在高压chambesure Xperiment中。较大的湍流雷诺数在573 K处的比例和友好不稳定性。 Kolmographorov量表可以被视为最大的初始流动障碍的量表。 I混合物是甲烷/空气混合物的修饰。被尘埃落定，在高压下估算湍流，并且基于湍流的雷诺数字是des是d的