基于体视激光诱导荧光（VLIF）的单次3D火焰诊断

2017/02/07   下载量： 2 次

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应用领域 其他
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5台高速相机从5个视角观测拍摄火焰中自由基CH的平面图像。通过空间重构，获得CH浓度的体视3D图像。

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We demonstrate single-shot three-dimensional (3D) flame measurements based on volumetric laser-
induced fluorescence (VLIF). For this effort, the excitation laser beam was expanded into a “slab”with a
height of 40 mm and thickness of 10 mm to excite the CH radicals in the target flames. The volumetric LIF
signals were then simultaneously captured by five intensified cameras, and the images were fed into a tomographic
algorithm as inputs to obtain the 3D distribution of CH. The results show that single-shot 3D
measurements with sufficient accuracy can be obtained in a volume of 9.3 × 9.3 × 32.7 mm 3 with an excita-
tion pulse energy of ∼10 mJ. With a total of fiv e intensified cameras, 3D measurements were obtained with a
voxel size of 0.15 mm over a total of 64 × 64 × 224 ≈10 6 voxels, which can be further improved by the use of
additional cameras or advanced tomographic inversion techniques. Comparison with PLIF measurements
suggested that the spatial resolution of the CH-based VLIF technique to characterize the flame surface was
about 0.4 mm. Measurements were first performed on stable laminar flames, for comparison and validation
against PLIF, and then on turbulent jet flames, to illustrate the feasibility and accuracy of VLIF for instantaneous
3D flame measurements and motivate further investigation.

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北京欧兰科技发展有限公司
金牌会员 丨 第17年
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