2DPIV技术在激光辐照液体贮箱中的应用
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摘要
实验研究激光对液体贮箱的辐照效应时,需测量贮箱内液体的流动状态。当壳体温度不超过液体的饱和温度时,贮箱内液体为自然对流形态。利用粒子图像测速(PIV)技术,搭建了二维数字PIV系统,实现了液体平面内的速度场测量。采用粒径1~5μm、密度1.05g/cm3的空心玻璃微珠微粒做为示踪粒子;利用532nm连续波激光器和三个平凸柱透镜构建了片光系统;采用装有微透镜阵列的CCD相机记录粒子图像;利用互相关算法处理粒子图像计算速度场。将此技术应用于激光辐照液体贮箱实验之中,实验结果与数值计算结果相符较好。
To measure the velocity field in a liquid tank irradiated by laser,a twodimensional digital particle image velocimetry system was designed in this paper.Small tracer particles,1~5μm diameter and 1.05g/cm3 density,were added to the liquid.A light sheet system was composed of a 532 nm continuous laser and three cylindrical lenses.A CCD camera with micro-lens array was used to capture the pictures of trace particles.Velocity fields were computed by evaluating the digital PIV recordings using cross-correlation method.Experimental results are proved to be in well agreement with the ones obtained by the numerical simulation.
To measure the velocity field in a liquid tank irradiated by laser,a twodimensional digital particle image velocimetry system was designed in this paper.Small tracer particles,1~5μm diameter and 1.05g/cm3 density,were added to the liquid.A light sheet system was composed of a 532 nm continuous laser and three cylindrical lenses.A CCD camera with micro-lens array was used to capture the pictures of trace particles.Velocity fields were computed by evaluating the digital PIV recordings using cross-correlation method.Experimental results are proved to be in well agreement with the ones obtained by the numerical simulation.
引文
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[2]Boley C D,Fochs S N,Rubenchik A M.Lethality effects of a high-power solid-state laser[J].J.of Directed Energy,2007,3(1):15-24.
[3]Marineau E C.Computational and experimental investigation of supersonic convection over a laser-heated target[J].J.of Thermophys.and Heat Transfer,2009,23(3):502-512.
[4]Bejan A.Convection Heat Transfer[M].3rd Edition.New Jersey:John Wiley&Sons.,2004:466-478.
[5]Raffel M,Willert C E,Wereley S T,et al.Particle Image Velocimetry[M].2nd Edition.Berlin Heidelberg:SpringerVerlag,2007:1-13.
[6]Willert C E,Gharib M.Digital particle image velocimetry[J].Experiments in Fluids,1991,10(4):181-193.
[7]Westerweel J.Fundamentals of digital particle image velocimetry[J].Measurement Science and Technol.,1997,8(12):1379-1392.
[8]Gui L,Merzkirch W.A comparative study of the MQD method and several correlation-based PIV evaluation algorithms[J].Experiments in Fluids,2000,28(1):36-44.