导叶轴向安放位置对核主泵性能的影响

发布时间：2018-06-30 00:05

  本文选题：核主泵 + 叶轮　； 参考：《排灌机械工程学报》2017年06期

【摘要】：基于Reynolds时均化N-S方程和RNG k-ε湍流模型,采用SIMPLE算法和多重坐标系法,对3种不同导叶轴向安放位置核主泵缩比模型的内部流动进行了全三维定常数值计算.通过对比分析外特性、压力场和速度场,研究了导叶轴向安放位置对模型泵叶轮、导叶和泵壳内部能量转换特性的影响.结果表明,减小导叶与泵出水管轴线在叶轮旋转轴线方向的距离,小流量工况下,泵的效率增加,其中叶轮效率增加,泵壳内的流动状态有所改善,回流现象有所抑制,从而减小了泵壳损失,但同时导叶损失也有所增加;设计及大流量工况下,泵的效率减小,其中叶轮效率有所降低,同时导叶和泵壳损失也相应增加.由于核主泵叶轮、导叶和泵壳的参数相互关联和影响,改变导叶轴向安放位置会影响各单元间耦合匹配特性,进而影响叶轮、导叶和泵壳内流动状态及能量转换效率.
[Abstract]:Based on Reynolds time homogenized N-S equation and RNG k- 蔚 turbulence model, three dimensional steady numerical calculations of the internal flow of three different axial position nuclear pump models are carried out by using simple algorithm and multiple coordinate system method. By comparing and analyzing the external characteristics, pressure field and velocity field, the influence of axial position of guide vane on the energy transfer characteristics of the impeller, guide vane and shell of the model pump was studied. The results show that when the distance between the guide vane and the axial line of the pump outlet pipe is reduced in the direction of the rotating axis of the impeller, the efficiency of the pump increases under the condition of small flow rate, in which the efficiency of the impeller increases, the flow state in the pump shell is improved, and the phenomenon of reflux is restrained. Therefore, the loss of the pump shell is reduced, but the loss of the guide vane is also increased, and the efficiency of the pump decreases under the design and large flow conditions, in which the efficiency of the impeller decreases, and the loss of the guide vane and the pump shell increases accordingly. Because the parameters of the impeller, the guide vane and the shell of the nuclear main pump are interrelated and affected, changing the axial position of the guide vane will affect the coupling and matching characteristics among the elements, and then affect the flow state and energy conversion efficiency in the impeller, the guide vane and the pump shell.
【作者单位】： 兰州理工大学能源与动力工程学院;甘肃省流体机械及系统重点实验室;
【基金】：国家自然科学基金资助项目(51469013)
【分类号】：TH38;TM623
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本文编号：2083956