明渠液固两相湍流结构及谱特征  

Turbulent structure and spectral characteristics of liquid-solid flow in open channel

作　　者：刘美艳 王海涛[1] 姜高群 LIU Mei-yan;WANG Hai-tao;JIANG Gao-qun(Jiangsu Surveying and Design Institute of Water Resources Co.,Ltd.,Yangzhou 225127,China)

机构地区：[1]江苏省水利勘测设计研究院有限公司,江苏扬州225127

出　　处：《广西水利水电》2020年第2期18-22,26,共6页Guangxi Water Resources & Hydropower Engineering

摘　　要：明渠液固两相湍流特征关系到渠内水流流态及泥沙的输运和沉积。通过明渠水槽试验,借助声学多普勒流速仪测量瞬时湍流流速,结合时均分析法和惯性耗散法统计分析脉动流速、Reynolds切应力、湍流强度、湍流自相关系数和湍流能量谱特征。结果表明:相对于单一液相,液固两相各湍流特征值明显增大,固相颗粒增加了液相的湍流强度;其次,河床处湍流涡漩弱于水深一半处和水面处,其对于固相颗粒的起动、输移具有关键作用;增加固相颗粒后,符合-5/3幂变化规律的能谱曲线更广,更有利于固相颗粒的输运。The flow pattern, sediment transport and deposition of the open channel are all influenced by the turbulence characteristics of the liquid-solid two-phase flow. Open channel flume test was conducted with the instantaneous turbulent velocity measured by ADV, based on which the pulsating velocity, Reynolds shear stress, turbulence intensity, turbulent autocorrelation coefficient and turbulent energy spectrum were all analyzed combined with two methods of time-average analysis and inertial dissipation. The results of analysis demonstrate that the turbulent characteristic values of liquid-solid two-phase are significantly higher than that of the single liquid phase which means the turbulent intensity of the liquid phase have increased by the solid particles;the turbulent vortex which plays a key role in the start-up and transport of solid particles is weaker at the riverbed than that at half of the water depth and the river surface;the turbulent energy spectrum curve conforming to the -5/3 power variation law become wider after increase of solid particles, which is more favorable for the transport of solid particles.

关 键 词：声学多普勒流速仪 脉动流速 Reynolds切应力 湍流强度 湍流自相关系数 

分 类 号：TV131[水利工程—水力学及河流动力学]