多股射流入流间距对下游水力特性影响分析

发布时间：2018-01-17 19:32

  本文关键词：多股射流入流间距对下游水力特性影响分析　出处：《水利水电技术》2016年04期 　论文类型：期刊论文

  更多相关文章： 多股射流 底流消能 入流间距 流态 立轴漩涡

【摘要】：基于RNG k-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,建立了三维紊流数学模型,并对多股底流水跃进行了三维模拟,详细分析了入流间距对多股底流消能下游流态的影响规律,探讨了不同孔距比下消力池内的漩涡特性。研究结果表明:入流间距对单股主流两侧流态影响显著,当孔距比大于1.5时,有回流形成;当孔距比大于等于2.0时,在弗汝德数约为7.0条件下,下游消力池底板附近已形成不同强度的立轴漩涡,所得成果可为相似研究提供参考。
[Abstract]:Based on RNG k- 蔚 turbulence model and VOF free surface tracing method, a three-dimensional turbulent mathematical model is established by using non-uniform structure mesh technology, and a three-dimensional simulation of multi-strand bottom income jump is carried out. The influence of inlet spacing on the downstream flow state of multi-strand bottom flow dissipation is analyzed in detail. The swirl characteristics in the stilling pool with different hole spacing ratios are discussed. The results show that the inflow spacing has a significant effect on the flow pattern on both sides of a single main stream. When the pore distance ratio is greater than 1.5, the reflux is formed. When the hole distance ratio is greater than 2.0 and the Froude number is about 7.0, the vertical vortex with different strength has been formed near the bottom plate of the downstream stilling pool. The results obtained can provide a reference for the study of similarity.
【作者单位】： 新疆额尔齐斯河流域开发工程建设管理局;中国水利水电科学研究院;
【基金】：国家自然科学基金(51309256)
【分类号】：TV135.2
【正文快照】： 高水头、大流量的泄洪消能设计、安全运行问题一直是近年来水利水电工程界所关心的热点问题。底流消能是利用在消力池内产生水跃进行消能的一种传统的消能方式,但由于需要规模较大、下游消力池临底水力学指标过高等因素制约了底流消能工的运用。多股底流消能在每股主流两侧增，

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