| Experimental study on three dimensional movements of particles Ⅱ Effects of particle diameter on turbulence characteristics |
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| 作者单位： | Limo TANG(State Key Laboratory of Hydrology-Water Resources and Hydraulic Engineering, Hohai University, Nanjing 210098, China);Xingkui WANG(State Key Laboratory of Hydroscience and Engineering, Tsinghua University, Beijing 100084, China) |
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| 基金项目： | 国家自然科学基金，the Science and Technology Innovation Foundation of Hohai University |
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| 摘 要： | Based on the 3D PTV （Particle Tracking Velocimetry） measuring system, the 3D movement characteristics of particles with four different diameters were investigated. Under specific flow conditions, the impact of particle diameters on 3D motion of particles was studied, and the turbulence characteristics were analyzed by different statistical methods. The results showed that the turbulence intensity of coarse particle decreased as the diameter increased. In near wall region, the probability density distributions of longitudinal and vertical fluctuation velocities both deviated from the normal distribution; while in the outer region, the probability density distribution of vertical fluctuation velocity approximately agreed with the normal distribution.
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| 关 键 词： | 三维运动 粒子跟踪 湍流特性 粒径 概率密度分布 试验 正态分布 运动特征 |
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