使用叠栅层析技术测量超音速风洞中的非对称复杂密度场

张斌; 宋旸; 宋一中; 贺安之

光学学报, 2006, 26 (10): 1501, 网络出版: 2006-10-31

使用叠栅层析技术测量超音速风洞中的非对称复杂密度场

Measurements of Asymmetric Complex Density Distribution in Supersonic Wind Tunnel by Moiré Tomography

论文大纲

张斌 ^*宋旸宋一中贺安之

作者单位

南京理工大学信息物理与工程系, 南京 210094

信息光学流场重建叠栅层析超音速风洞 information optics flow field reconstruction moiré tomography supersonic wind tunnel

摘要

使用叠栅层析技术解决超音速风洞中复杂密度场的测量难题。应用高灵敏度叠栅偏折仪和间隔角度旋转模型的方法获取超音速风洞中流场的多方向叠栅条纹图。层析计算中使用一种新的偏折角修正迭代的叠栅层析算法,该方法可以实现对有限角采样和包含遮挡物的非完全数据重建,迭代过程中结合内边界平滑滤波提高重建精度。实验中获取了马赫数为2.52的超音速风洞中9幅不同采样角的条纹图,经过50次迭代计算后重建出膨胀波区非对称密度场的截面分布,并对测量结果和误差进行了分析和讨论。使用计算流体力学技术对该密度场进行建模和计算,验证了叠栅层析重建结果的正确性,证实了该技术在测量复杂流场领域的重要价值。

Abstract

Moiré tomography is applied to measure the complex density distribution in supersonic wind tunnel. Multidirectional moiré fringe patterns of flow field in supersonic wind tunnel are obtained by using high precision moiré deflectometer and discrete angle rotating mode. In the tomography, a new moiré tomographic algorithm with deflection angle revision iteration is employed to realize the limited angle sampling and incomplete data reconstruction containing covering. In the iterative process higher reconstructing precision is achieved by using inner boundary smoothing filtering. In experiments, 9 tomograms with different view angles in supersonic wind tunnel with Mach number 2.52 are obtained, the distribution on the cross section of asymmetric flow field in the swelling area of supersonic wind tunnel is reconstructed after 50 iterative computations, and the measured results and errors are analyzed and discussed. Computing fluid dynamics is used to simulate and compute the density field, verifies the validity of the reconstruction results of moiré tomography, and proves the important value of the technology in measuring complex fluid field.

参考文献

[1] Yao Wei, He Anzhi. Threedimensional flow field tomography based on phase unwrapping[J]. Acta Optica Sinica, 1998, 18(11): 1562～1566 (in Chinese)
姚卫, 贺安之. 基于相位展开的三维流场干涉层析术[J]. 光学学报, 1998, 18(11): 1562～1566

[2] Yan Dapeng, Liu Feng, Wang Zhendong et al.. A modified ART reconstructive technique and its application to threedimensional temperature field[J]. Acta Optica Sinica, 1996, 16(9): 1296～1300 (in Chinese)
阎大鹏, 刘峰, 王振东等. 一种改进的代数迭代重建技术及其在三维温度场再现中的应用[J]. 光学学报, 1996, 16(9): 1296～1300

[3] . Vest, Ivan Prikryl. Tomography by iterative convolution: empirical study and application to interferometry[J]. Appl. Opt., 1984, 23(14): 2433-2440.

[4] . Sller, R. Wenskus, P. Middendorf et al.. Interferometric tomography for flow visualization of density fields in supersonic jets and convective flow[J]. Appl. Opt., 1994, 33(14): 2921-2932.

[5] Wang Jiangang, Miao Xinghua, Wang Guozhi et al.. Twoexposure holography for study of shockwave flow generated by a model in a supersonic wind channel[J]. Acta Photonica Sinica, 1997, 26(4): 374～378 (in Chinese)
王建岗, 苗兴华, 王国志等. 双曝光全息干涉法用于风洞中激波流场的研究[J]. 光子学报, 1997, 26(4): 374～378

[6] . Kafri, I. Glatt. Moire deflectometry: A ray deflection approach to optical testing[J]. Opt. Engng., 1985, 24(6): 944-960.

[7] . Stricker, E. Keren, O. Kafri. Axisymmetric density field measurements by moire deflectometry[J]. AIAA, 1983, 21(12): 1767-1769.

[8] . Stricker, O. Kafri. A new method for density gradient measurements in compressible flows[J]. AIAA, 1982, 20(6): 820-823.

[9] . A novel limitedview tomography algorithm based on maximum entropy and its application[J]. Acta Optica Sinica, 2003, 23(12): 1433-1438.

[10] 万雄, 何兴道, 高益庆. 一种少投影光学层析新算法及其应用[J]. 光学学报, 2003, 23(12): 1433～1438

[11] Yan Dapeng, Liu Feng, Wang Zhendong et al.. Moire tomography by ART[C]. Proc. SPIE, 1996, 2861: 146～150

[12] . . High sensitivity moire deflectometry and its application in flow field of hypersonic shock tunnel[J]. Acta Aerodynamica Sinica, 1994, 12(1): 43-50.

[13] He Anzhi, Yan Dapeng, Ni Xiaowu et al.. Design and application of realtime holographic largeaperture Moiré deflector with high sensitivity and high precision[J]. Chin. J. Lasers, 1991, 18(11): 827～831 (in Chinese)
贺安之, 阎大鹏, 倪晓武等. 实时大口径高灵敏度高精度莫尔偏折仪的设计和应用[J]. 中国激光, 1991, 18(11): 827～831

张斌, 宋旸, 宋一中, 贺安之. 使用叠栅层析技术测量超音速风洞中的非对称复杂密度场[J]. 光学学报, 2006, 26(10): 1501. 张斌, 宋旸, 宋一中, 贺安之. Measurements of Asymmetric Complex Density Distribution in Supersonic Wind Tunnel by Moiré Tomography[J]. Acta Optica Sinica, 2006, 26(10): 1501.

使用叠栅层析技术测量超音速风洞中的非对称复杂密度场

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