摘要
采用物理模型实验与三维数值模拟相结合的方法,对采取盖板控制法后的泄洪洞明流弯道水力特性展开了研究,并与未设盖板情况进行了对比。结果表明:设置盖板后,弯段及下游直段水流流态得到改善,弯道两岸及出口水深分布更加均匀,下游直段水流表面波动明显削减,大流量情况下水流流态改善效果更加显著,下游直段水流表面波动更平稳,两岸水深超过直墙的现象消失;弯道流速分布更加均匀,凹凸两岸流速差值降低,平面流场分布更加均匀;底板压强随泄流量的增大而增大,设置盖板后压强增加,弯道出口处压强减小且分布更加均匀,验证了泄洪隧洞急流弯道段设置盖板工程措施的合理性。研究成果可为弯道的流态改善措施提供新思路。
Physical model and numerical simulation was used to study and compare the hydraulic characteristics of the bend which was set a cover plate or not. The results show that after placing the slab, the flow distribution along the tunnel became more even and the phenomenon of water depth above the wall disappeared. Flow velocity distribution and stream field of the plane become more even and the difference of velocity on both sides reduces. The pressure increased as the discharge increased. The pressure in the outlet of bend reduced and became more uniform. The measure of placing slab over bend was verified rational especially in a large rate of flow. Research results can provide new ideas for flow improvements of the bend.
出处
《中国科技论文》
CAS
北大核心
2016年第19期2265-2272,共8页
China Sciencepaper
基金
国家自然科学基金资助项目(51209155)
关键词
泄洪隧洞
急流弯道
盖板
水力特性
数值模拟
tunnel bend
supercritical flow
cover plate
hydraulic characteristics
numerical simulation
