水资源与水工程学报Issue(1)：143-148,153,7.DOI:10.11705/j.issn.1672-643X.2015.01.028
基于水模拟回风流场的 PIV 测试粒子跟随性研究
Research on flowing behaviors of particle tracers tested by PIV based on water simulating air return flow field
摘要
Abstract
According to similarity theory, the paper chose a large space building and established an experimental table of liquid water model with 1∶15 reduced-scale to study flow field characteristics a-round the return air grille in a large space building air-conditioned with low-side wall air supply and medium-height air return.It took salt water as fluid medium and chose the polystyrene particles whose diameter was from 10 to 100μm as tracer particles to calculate their flowing behaviors and accuracy in tracing non-uniform flow field around the air return grille.Three indexes such as velocity amplitude ra-tio η, settling velocity Ug and delay velocity Us were used to judge whether their flowing characteristics were good.The results indicate that when the density ratioσbetween the particles and the fluid is less than 1.0, the smaller the diameter of particles, the smaller the velocity amplitude ratioηis, andηis close to 1.0, which means that the flowing behaviors is better.While the density ratioσis larger than 1, the smaller the diameter of particles, the larger is its velocity amplitude ratioη, and the closer the value of ηis 1,the better are the flowing behaviors.The better flowing behaviors represented that the tested flow field could truly reflex the actual flow field Characteristics.The paper used PIV technique to get the velocity information of air return flow field.The results indicated that under certain experi-ment conditions, the settling velocity Ug has no influence on particle movement and the delay velocity Us is very little, which demonstated the flowing behaviors of the particles are fairly well in the salt water fluid medium.关键词
粒子图像测速技术/液态水模型/示踪粒子/跟随性/速度幅值比/沉降速度Key words
particle image velocimetry/liquid water model/tracer particle/flowing behaviors/veloci-ty amplitude ratio/sedimentation velocity分类
建筑与水利引用本文复制引用
秦俊,黄晨,王昕,吴丹..基于水模拟回风流场的 PIV 测试粒子跟随性研究[J].水资源与水工程学报,2015,(1):143-148,153,7.基金项目
国家自然科学基金面上项目（51278302）；国家自然科学基金项目（51108263）；沪江基金 （）
