基于双目散斑的3D-PSP技术及其在压气机叶栅中的应用

doi:10.7527/S1000-6893.2025.31617

Abstract

Abstract:

Reconstruction of 3D pressure is crucial for Pressure-Sensitive Paint （PSP） measurements. We propose a method for three-dimensional pressure reconstruction combining binocular digital image correlation technology. The PSP measurement results are mapped to the reconstructed three-dimensional point cloud pixel by pixel to realize the three-dimensional pressure reconstruction without relying on the geometric parameters of the measured model. The method involves creating random speckle patterns on the PSP coating surface and using two cameras to synchronously capture PSP images. By integrating cross-correlation analysis and the principles of binocular stereo vision in PSP data processing， we achieve precise reconstruction of the 3D pressure on the measured surface. This method has been successfully applied to the 3D pressure measurement on the surface of a compressor cascade， and a comparative analysis with pressure tap data has shown that the relative deviation of the PSP data is within 1.2%. Furthermore， the accuracy of the measurement results has been verified by comparing the reconstructed 3D point cloud with a CAD model， with an average deviation of 0.17 mm.

Key words: pressure-sensitive paint, digital image correlation, binocular stereo vision, speckle, three-dimensional pressure reconstruction

CLC Number:

V231.3

Limin GAO, Jun ZHANG, Bo OUYANG, Lei WANG. Binocular speckle-based 3D-PSP technique and its applications in compressor cascade[J]. Acta Aeronautica et Astronautica Sinica, 2025, 46(17): 131617.

Figures/Tables 23

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Table 1

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Table 2

Camera calibration results

标定参数	相机1	相机2
内参矩阵 $K$	$2 751.297 19.852 548.384 0 2 763.185 474.132 001$	$2 913.006 - 14.874 651.583 0 2 909.058 351.819 001$
径向畸变 $(k a, k b, k c)$	$(- 0.746 5.737 - 73.945)$	$(0.648 - 67.826 1 200.799)$
切向畸变 $(p a, p b)$	$(0.022 - 0.047)$	$(0.006 - 0.007)$
旋转矩阵 $R$	$100010001$	$0.972 0.012 0.234 - 0.017 0.999 0.019 - 0.234 - 0.023 0.972$
平移向量 $T$	$000 T$	$- 111.008 3.265 60.934 T$

Table 2

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References 38

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参数	数值
弦长C/mm	69.55
几何进气角β_1k/（°）	45.83
几何出气角β_2k/（°）	6.22
叶片安装角γ/（°）	26.58
栅距t/mm	64.00

Binocular speckle-based 3D-PSP technique and its applications in compressor cascade

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