摘要
珊瑚砂在液体中的沉速是反映泥沙运动特性的一个重要物理量。由于珊瑚砂形状多样,套用现有的珊瑚砂沉速公式进行计算并不合适。针对珊瑚砂颗粒开展形状分析,将珊瑚砂颗粒分成枝棒状、片状和块状3种形状,然后开展单颗粒沉降试验。基于试验数据,分析不同形状珊瑚砂颗粒的沉降特性,与各家理论公式计算结果进行比较分析,选取经典的珊瑚砂颗粒沉速公式,引入颗粒形状系数进行公式修正,从而推求了枝棒状、片状和块状珊瑚砂颗粒的阻力系数和沉降速度公式。该公式充分考虑不规则珊瑚砂颗粒形状的影响,具有更高的计算精度和适用性。
The setting velocity of coral sand in liquid is an important physical quantity reflecting sediment movement characteristics.However,due to the different shapes of coral sand,the existing formulas for calculating setting velocity are not suitable.Based on A series of single particle settlement experiments have been carried out for three typical shapes of coral sand,namely rodlike,platy and blocky sand.Based on the experiment data,the settlement characteristics of coral sand with different shapes are analyzed and compared with the results calculated by various theoretical formulas.After selecting the classic formula for the settling velocity of coral sand particles and introducing the shape coefficient to modify the formula,so that the drag coefficient and setting velocity formulas of rodlike,platy and blocky coral sand particles are further deduced.These formulas fully consider the influence of irregular coral sand particle shape,and have higher calculation accuracy and applicability.
作者
陈杰
蒋超
蒋昌波
姚震
CHEN Jie;JIANG Chao;JIANG Chang-bo;YAO Zhen(School of Hydraulic and Environmental Engineering,Changsha University of Science&Technology,Changsha 410114,China;Laboratory of Dongting Lake Aquatic Eco-Environmental Control and Restoration of Hunan Province,Changsha 410114,China;Key Laboratory of Water-Sediment Sciences and Water Disaster Prevention of Hunan Province,Changsha 410114,China)
出处
《泥沙研究》
CAS
CSCD
北大核心
2024年第1期8-15,共8页
Journal of Sediment Research
基金
国家重点研发计划项目(2021YFB2601100)
国家自然科学基金重点项目(51839002)
国家自然科学基金面上项目(51979014,52271257)
湖南省杰出青年科学基金项目(2022JJ10047)。
关键词
珊瑚砂
颗粒形状
沉降速度
阻力系数
coral sand
particle shape
setting velocity
drag coefficient
