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Particle Image Velocimetry (PIV) application in the measurement of indoor air distribution by an active chilled beam

机译:粒子图像测速技术(PIV)在主动冷梁测量室内空气分布中的应用

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We study the turbulent air flow behaviours of the attached plane jet discharged from an active chilled beam in a room using Particle Image Velocimetry (PIV). PIV is an innovative technology to study indoor air flow which began in the eighties of the last century for the measurement of whole air flow fields in fractions of a second. Here an experimental PIV system was built to reveal the structure of a turbulent attached plane jet in the entrainment process of the ambient air downstream from the jet slot. For the particle seeding in the PIV experiments, a few different particles were tested with the attached jet PIV application in a room. The results presented in this paper show the clear structure of the turbulent attached plane jet in the entrainment process after issuing from the chilled beam slot. The PIV visualisation results proved that the jet will attach to the ceiling and become fully turbulent a short distance downstream from the slot. The jet velocity vector fields show that the volume flow rate of the attached plane jet increases because of the large vortex mixing mechanism in the outer region of the jet. In three measurement cases, the air jet grows faster at a Reynolds number of 960 than at Reynolds numbers of 1320 and 1680. The calculated spreading angles in the cases with lower Reynolds numbers have similar values compared with the visualisation results.
机译:我们使用粒子图像测速技术(PIV)研究了房间中主动冷梁释放的附着平面射流的湍流空气行为。 PIV是一项研究室内气流的创新技术,始于上世纪八十年代,用于在几分之一秒内测量整个气流场。在这里,建立了一个实验性PIV系统,以揭示在射流槽下游的环境空气的夹带过程中,湍流附着的平面射流的结构。对于PIV实验中的粒子播种,在房间中使用附加的喷射PIV应用测试了一些不同的粒子。本文给出的结果表明,在从冷梁缝隙发出后的夹带过程中,湍流附着平面射流的结构清晰。 PIV的可视化结果证明,射流将附着在天花板上,并在狭缝下游的短距离内变得完全湍流。射流速度矢量场表明,由于在射流的外部区域中存在较大的涡流混合机制,因此附着的平面射流的体积流率增加。在三种测量情况下,雷诺数为960时,喷气流的增长快于1320和1680的雷诺数。在较低雷诺数的情况下,所计算的扩展角与可视化结果相比具有相似的值。

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