跌扩型底流消能漩涡特性的初步研究  

Preliminary study of vortex on energy dissipation by hydraulic jump with vertical drop and sudden enlargement

作　　者：郑铁刚[1] 戴会超 孙双科[1] 柳海涛[1] 

机构地区：[1]中国水利水电科学研究院流域水循环模拟及调控国家重点实验室,北京100038 [2]水文水资源与水利工程科学国家重点实验室,江苏南京210098

出　　处：《水利水电技术》2013年第11期29-33,共5页Water Resources and Hydropower Engineering

基　　金：国家自然科学基金青年科学基金(51309256);国家重点基础研究发展计划(2012CB417006);国家杰出青年基金(50925932)

摘　　要：多股跌扩型底流消能是一种新型消能方式,消力池内紊流特性复杂.基于RNGκ-ε紊流模型和VOF自由表面追踪法,采用非均匀结构网格技术,建立了三维素流数学模型,对高低坎多股跌扩型底流消能工进行高精度数值计算.讨论了不同消能方案下游消力池内漩涡分布及变化特性,指出：跌扩型底流消能,水流紊动剧烈,各种漩涡结构交织,下游消力池底板、边墙及跌坎附近随机形成了强度和尺度各异的立轴和横轴漩涡,但漩涡具有一定的游移性和间歇性;消力池底板X=0＋0.0～0＋40.0范围为立轴漩涡高发区;边墙处漩涡主要分布在高程Z=4.0～16.0m范围.The multi-strand submerged jets at different levels discharged into plunge pool is utilized as a new type of energy dis- sipater for high dam, of which the turbulent characteristics is quite complicated. Based on RNG K - 6 turbulent model and VOF method, a 3-D turbulent numerical method was estabished with the technique of the non-uniform structured grid, and then a high- precision numerical calculation is made on the new type of energy dissipater. Moreover, the vortex distributions in the downstream plunge pools of various energy dissipation schemes and their changing characteristics are discussed. It is pointed out that the flow is strongly turbulent with the interleaving of all kinds of vortex structures, i.e. vertical and horizontal vortexes with different in- tensities and scales are randomly formed near the bottom-slab, side-wall and drop step of the downstream plunge pool with a cer- tain scale of vacillation and intermittence, while the that vertical vortexes highly appear within the rang from 0 ＋ 0. 0 to 0 ＋ 40. 0 in the front of plunge pool and the vortexes appeared at the side-wall are mainly distributed at the elevation of 4. 0 to 16.0.

关 键 词：跌扩 底流消能 漩涡 数值模拟 

分 类 号：TV148[水利工程—水力学及河流动力学]