摘要
应用MicroADV研究了不同粒径的泥沙颗粒在不同水力条件下对水流流动结构的影响。实验发现:挟沙水流流动结构的变化不仅与颗粒的大小密切相关,而且与水流流动条件有关,颗粒对水流结构的影响随着水力条件的变化而改变:在强水流条件下,不论粗、中、细泥沙都不改变主流区的流速分布及紊动强度;在中等强度水流条件下,粗、中、细三种颗粒的加入都使流速大于相同条件的清水水流,而其紊动强度则较清水水流低;在弱水流条件下,三种颗粒的加入都不改变水流的流速分布,但粗颗粒使水流紊动强度显著增大,而中、细颗粒基本不改变其紊动强度。
The influence of suspended sediment particles on flow structure in open channel was studied experimentally.Three kinds of particle including coarse(0125～02mm),medium (0065～009mm)and fine(<0065mm)were added into the flow with different Reynolds number (Re)respectively.Micro ADV was applied to measure the flow field.It is found that the interaction between sediment particles and flow were related both to particle diameter and flow condition.In the condition of flow with medium Re,the present of particles elevates the mean velocity and velocity gradient,but the turbulence intensity was reduced accordingly.In the flow with higher Re,the present of particles hasn't noticeable impact on mean velocity and turbulence intensity.While in lower Re,the coarse particles enhance the turbulence intensity and the medium sized particles will not change the turbulence intensity at all.
出处
《水利学报》
EI
CSCD
北大核心
2003年第9期39-42,47,共5页
Journal of Hydraulic Engineering
基金
国家自然科学基金(50079018)
霍英东青年教师基金(71070)
高等学校骨干教师资助计划资助
