依据湍流预混火焰2D平面激光诱导荧光成像测量结果估算3D火焰表面密度和全局燃料消耗速率

2017/02/27   下载量： 3 次

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应用领域 其他
检测样本 其他
检测项目
参考标准 暂无

采用LaVision公司的FlameMaster系统。测量了火焰对象的2D平面激光诱导荧光信号。并依据结果估算了3D火焰表面密度和全局燃料消耗速率。

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In premixed turbulent combustion, flame surface density (FSD) is a key parameter and can be used to
estimate the system reaction rates. Even though laser diagnostic technics (Mie scattering or OH/CH-PLIF)
on flame front provided very useful information of flame front wrinkles, the measurement is limited to a
plane on which wrinkles in the third direction is unavailable. In this study, the estimation of 3D FSD (R)
and the global fuel consumption rate (W) from planar measurements of 2D FSD (R2D) was conducted on a
Bunsen-type burner fueled with methane/air mixture at the equivalence ratio of 0.9. Assuming symmetry
of the mean flow, five different models designated as Method 1 to Method 5 (M1 to M5) based on different
additional assumptions were utilized. M1 connected the 2D to 3D FSD with a typical value of 0.69. M2
and M3 were based on isotropic flame front normal vector distribution and identical / and h distribution
which designate the direction angle of front normal in 3D space and the measurement plane. M4 and M5
assumed that normal vector fluctuation intensity of transverse direction was similar with x or y direction
on the measurement plane, respectively. W was also obtained by integrating the R within the flame
domain and the flame stretch factor, I0 was evaluated based on fractal analysis of the 2D measurements.
For all methods, the results are satisfying. Results of M1 indicate that a typical direction cosine value of
0.69 is valid for the turbulent Bunsen flame in this study and the satisfied W estimation under higher turbulent
intensities is provided. Results of M2 are relatively rough for overestimating W by about 40%
under most conditions because of its intrinsic deficiency of the 1=hcos /is evaluation. M3 based on the
assumed identical cosine value of mean direction angle of 3D and 2D flame front presented by / and h
gave rather good estimation as M4. M4 and M5 provide the best evaluation of W, absolute error within
17% except low turbulence conditions (u0/SL  0.2 and 0.4) of M4, by the normal vector fluctuation
analysis. 2D data, as expected, underestimates W. Better W can be obtained considering the flame stretch
factor, I0.

上一篇 在一个双稳湍流涡旋火焰中，对间歇性动态的时间-频率定位
下一篇 虾青素自由基清除和细胞抗氧化剂特性

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