导流锥对低扬程双向轴流泵装置水力性能的影响

发布时间：2018-02-03 13:52

本文关键词： 导流锥泵装置进水流道双向轴流泵水力性能　出处：《水电能源科学》2017年07期 　论文类型：期刊论文

【摘要】：为研究导流锥对低扬程双向轴流泵装置水力性能的影响,以苏南某泵站为例,设定有、无导流锥两种方案,基于RNG湍流模型,采用CFD方法对双向轴流泵装置进行全流道三维湍流数值计算。结果表明,无导流锥时,进水流道水流流态较有导流锥时紊乱,且水流从进水流道喇叭口下方周围环向进水,喇叭口中心处出现奇点;有导流锥时,导流锥占据了喇叭口下方奇点位置,消除了奇点。有导流锥时,出口流场均匀性较好,进水流道的水力损失随着流量的增加而逐渐增加;无导流锥时进水流道的水力损失较大,最大差值达0.05m。导流锥对水泵装置效率影响较大,增幅达4.1%,增设导流锥可显著提高水泵装置效率。
[Abstract]:In order to study the influence of diversion cone on hydraulic performance of low head bidirectional axial flow pump device, taking a pumping station in southern Jiangsu as an example, two schemes with no diversion cone are set up, based on RNG turbulence model. The CFD method is used to calculate the three-dimensional turbulent flow of the two-direction axial flow pump device. The results show that the water flow pattern of the inlet channel is more disordered than that of the diversion cone without the diversion cone. The flow of water flows from the inlet channel below the bell mouth to the inlet, and the singularity appears at the center of the bell mouth; When there is a diversion cone, the diversion cone occupies the position of the singularity below the bell mouth and eliminates the singularity. When there is a diversion cone, the uniformity of the outlet flow field is better, and the hydraulic loss of the inlet channel increases gradually with the increase of the flow rate. When there is no diversion cone, the hydraulic loss of inlet passage is larger, the maximum difference is up to 0.05m.The diversion cone has a great influence on the efficiency of pump unit, and the increase is up to 4.1, and the efficiency of pump installation can be improved significantly by adding diversion cone.
【作者单位】：河海大学水利水电学院;河海大学能源与电气学院;
【基金】：国家自然科学基金项目(51579080,51339005) 安徽省自然科学基金项目(1608085ME119) 中央高校基本科研业务费项目(2015B34314)
【分类号】：TV136.2
【正文快照】： 1引言进水流道的水力设计对泵装置水力性能的影响很大,进水流态不良不仅会降低泵的能量性能、空化性能,甚至还会产生影响水泵稳定运行的吸气涡带或水下涡带。进水流道内的导流锥可避免进水流道内的死水与动水相互摩擦撞击而造成流态紊乱,以减少涡流、汽蚀,故有必要对进水流道

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