Abstract
The shading method is a simple but effective way of reducing image blooming in the measurement of open channel flows with the Particle Image Velocimetry (PIV). The current paper proposes a simplified analytical model for light attenuation using this method. The model is verified against experimental data, and the influence of several parameters is illustrated numerically. The possible adverse effect due to the light attenuation is shown to be limited when the parameters in the shading method are in an adequate range, as shown by processing standard images of Case B in PIV Challenge 03. A simple criterion for setting the shade in experiment is given for controlling the errors caused by the shading technique within an acceptable range.
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LI Shi-rong, CHENG Wen and WANG Meng et al. The flow patterns of bubble plume in an MBBR[J]. Journal of Hydrodynamics, 2011, 23(4): 510–515.
ZHANG Jin-feng, ZHANG Qing-he and LU zhao. Lattice Boltzmann simulation of particle settling and experimental validation by PIV[J]. Advances in Water Science, 2009, 20(4): 480–484(in Chinese).
WU Fu-sheng, JIANG Shu-hai and YANG Xue-lin. Characateristics of 2D-vortex field in open channel flow with submerged rigid vegetation[J]. Chinese Journal of Hydrodynamics, 2010, 38(2): 256–259(in Chinese).
SENTER J., SOLLIEC C. Flow field analysis of a turbulent slot air jet impinging on a moving flat surface[J]. International Journal of Heat and Fluid Flow, 2007, 28(4): 708–719.
RAFFER M., WILLERT C. E. and WERELEY S. T. et al. Particle image velocimetry a practical guide[M]. Germany: Springer-Verlag, 2007, 69–71.
MA Chong, LI Hua-xing and MENG Xuan-shi et al. PIV study of induced flowfield on steady and periodic-pulsed dielectric-barrier-discharges[J]. Chinese Journal of Applied Mechanics, 2011, 28(3): 308–312(in Chinese).
DI FELICE F., PEREIRA F. Developments and applications of PIV in naval hydrodynamics particle image velocimetry: New developments and recent applications[M]. Germany, Berlin: Springer-Verlag, 2008, 475–503.
YU Xiao, LUO Xiang and XU Guo-qing et al. Particle Image Velocimetry(PIV) measurements of the flow in a rotating cavity with a radial inflow[J]. Journal of Aerospace Power, 2009, 24(11): 2483–2488(in Chinese).
FISHER C. W., MIDDLETON N. T. and LINNE M. A. et al. Phase sensitive imaging system development for laser dlagnostic systems with inherently large background constraints[C]. Lasers and Electro-Optics, Conference on Lasers and Electrooptics. Washington DC, USA, 1999, 15.
HAIN R., KAHLER C. J. and TROPEA C. Comparison of CCD, CMOS and intensified cameras[J]. Experiments in Fluids, 2007, 42(3): 403–411.
EKOTO I. W., BOWERSOX R. D. W. and SRINIVASAN R. et al. Examination of cameras for near-wall PIV measurements in high speed flows[C]. 44th AIAA Aerospace Sciences Meeting and Exhibit. Reno, USA, 2006, 1–10.
ARNOTT A., SCHNEIDER G. and NEITZKE K. P. et al. Multi-window PIV for high-lift measurements[C]. 20th International Congress on Instrumentation in Aerospace Simulation Facilities. Göttingen, Germany, 2003, 44–53.
DI Yi-bo, DING Jue and WENG Pei-fen. Experiments on viscous flows around low-aspect-ratio wing at low Reynolds numbers[J]. Journal of Shanghai University (Natural Science Edition), 2009, 15(4): 399–403(in Chinese).
WU P., SÄLLSTRÖM E. and UKEILEY L. et al. Structural dynamics, Volume 3[M]. New York: Springer, 2011, 1441–1451.
MULA S. M., STEPHENSON J. and TINNEY C. et al. Vortex jitter in hover[C]. American Helicopter Society Southwest Region Technical Specialists Meeting. Fort Worth, Texas, USA, 2011, 182–206.
DI FELICE F., DI FLORIO D. and FELLI M et al. Experimental investigation of the propeller wake at different loading conditions by particle image velocime-try[J]. Journal of Ship Research, 2004, 48(2): 168–190.
VOGES M., SCHNELL R. and WILLERT C. et al. Investigation of blade tip interaction with casing treatment in a transonic compressor–Part I: Particle image velocimetry[J]. Journal of Turbomachinery–Transactions of the ASME, 2011 (1), 133: 1–11.
STANISLAS M., OKAMOTO K. and KAHLER C. J. et al. Main results of the second international PIV challenge[J]. Experiments in Fluids, 2005, 39(2): 170–191.
SCARANO F., RIETHMULLER M. L. Iterative multi-grid approach in PIV image processing with discrete window offset[J]. Experiments in Fluids, 1999, 26(6): 513–523.
SCARANO F., RIETHMULLER M. L. Advances in iterative multigrid PIV image processing[J]. Experiments in Fluids, 2000, 29(Suppl. 1): S51–S60.
SCARANO F. Iterative image deformation methods in PIV[J]. Measurement Science and Technology, 2002, 13(1): 1–19.
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Project supported by the National Natural Science Foundation of China (Grant No. 50779023).
Biography: ZHONG Qiang (1985-), Male. Ph. D. Candidate
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Zhong, Q., Li, Dx., Chen, Qg. et al. Evaluation of the Shading Method for Reducing Image Blooming in the PIV Measurement of Open Channel Flows. J Hydrodyn 24, 184–192 (2012). https://doi.org/10.1016/S1001-6058(11)60233-3
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DOI: https://doi.org/10.1016/S1001-6058(11)60233-3