基于多紫外相机的旋流火焰三维锋面层析重建

doi:10.7527/S1000-6893.2022.28331

Abstract

Abstract:

The front of swirl flame can be used to characterize the flame macrostructure and combustion stability， making its transient 3D structure measurement extremely important for research on the swirl combustion mechanism and swirl burner optimization. A measuring approach for the transient 3D front of swirl flame by ultraviolet multi-camera imaging is proposed. In order to acquire transient chemiluminescence information at a low cost with high precision， a Computed Tomography of Chemiluminescence （CTC） system based on ultraviolet multi-camera array is built. Additionally， the Simultaneous Algebraic Reconstruction Technique （SART） is improved using a pre-recognition method for non-intensity voxels identification by ray tracing， resulting in less computational load and reconstruction artifacts. Numerical simulation experiments are executed to confirm the accuracy and noise immunity of the reconstruction algorithm. A methane-air premixed swirl combustion experimental rig is built finally， and the calibration of the ultraviolet multi-camera imaging system and low-swirl flame front experiments are carried out. The results show that the accuracy of the inverse projection exceeds 0.97 while the calculation is reduced by 59.6%. The low swirl flame expands at the nozzle exit under stable combustion conditions and displays a vortex bowl-shaped structure. In addition， the flame pushing height rises slightly as the equivalent ratio grows， and the flame volume gradually increases as well， which enhances combustion stability.

Key words: ultraviolet imaging, swirl flame, front structure, tomographic reconstruction, chemiluminescence

CLC Number:

Haowei NI, Guoyan LIU, Yi ZHOU, Biao ZHANG, Weijie LIU, Chuanlong XU. 3D front tomographic reconstruction of swirl flame by ultraviolet multi-camera imaging[J]. Acta Aeronautica et Astronautica Sinica, 2023, 44(18): 128331-128331.

Figures/Tables 22

Fig.1

Fig.2

Fig.3

Fig.4

Fig.5

Table 1

Fig.6

Fig.7

Fig.8

Table 2

Fig.9

Table 3

Calibration results of CTC system parameters

参数	相机1	相机2	相机3
校准矩阵Q	$0.998 5 0.056 4 0.016 5 - 2.823 0 - 0.047 4 0.998 1 0.012 0 1.542 5 - 0.014 8 - 0.040 1 0.999 1 - 0.144 5 0001$
内参矩阵M₁	$6 652.5 0 1 036.4 0 6 652.6 1 029.7 001$	$6 633.8 0 1 067.4 0 6 633.5 1 040.0 001$	$6 525.0 0 1 027.0 0 6 525.1 1 024.0 001$
径向畸变D	$- 0.50 6.42 - 23.59$	$- 0.40 - 0.75 - 44.46$	$- 0.37 - 0.73 - 11.56$
旋转矩阵R	$100010001$	$0.747 8 0.002 7 - 0.663 9 - 0.007 1 1.000 0 - 0.004 0 0.663 9 0.007 7 0.747 8$	$0.774 4 0.002 1 - 0.632 7 - 0.005 3 1.000 0 - 0.003 1 0.632 7 0.005 7 0.774 4$
位移矩阵T	$000 T$	$220.29 3.94 88.05 T$	$214.86 1.58 73.45 T$
相对角度θ		41°36′	39°15′

Table 3

Fig.10

Fig.11

Fig.12

Fig.13

Table 4

Fig.14

Table 5

Experimental conditions

工况	Φ	$V C H 4$ /（L·min^-1）	$V A i r$ /（L·min^-1）	$t e x p$ / $μ$ s
1	0.47	8.6	175	200
2	0.51	9.4	175	200
3	0.55	10.1	175	200
4	0.59	10.9	175	200

Table 5

Fig.15

Fig.16

Fig.17

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参数	数值
传感器尺寸	2 in
分辨率（宽×高）	2 048 pixel × 2 048 pixel
像素尺寸	11 μm×11 μm
最大帧速率	24 Hz
量子效率@308 nm	50%
曝光时间	20 μs ~ 10 s
颜色	单色
动态范围	16 bit

z/mm	无噪声	10%噪声	20%噪声
8.8	0.993 9	0.990 8	0.983 7
15.6	0.990 9	0.990 0	0.987 1
22.4	0.993 8	0.993 4	0.992 2
29.2	0.954 5	0.954 5	0.950 4
36.0	0.939 1	0.938 8	0.936 6
42.8	0.904 4	0.904 4	0.900 0

相机编号	平均相对误差/%	相关系数
1	6.92	0.992 4
2	9.14	0.985 3
3	8.70	0.972 6
4	9.01	0.976 5
5	9.99	0.977 1
6	8.18	0.989 8
7	7.26	0.985 8
8	7.38	0.992 7

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3D front tomographic reconstruction of swirl flame by ultraviolet multi-camera imaging

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