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.
A three-dimensional numerical investigation was carried out in a reactor coolant pump scale model at three different guide vane axial positions to study the influence of guide vane axial position on internal energy conversion characteristics of impeller, guide vane and pump casing by comparing and analyzing hydraulic characteristics, pressure field and velocity field,and based on Reynolds -averaged N - S equations and RNG k - ε turbulent model with multiple reference frame and SIMPLE algorithm. The results show that reducing the distance between the guide vane and the pump outlet pipe axis in the impeller rotation axis direction has great influence on the flow state and hydraulic loss in pump and flow components. Under the part-load conditions reducing that distance makes the efficiency of pump and impeller increase, which improves the flow state and suppresses the backflow phenomenon thus reducing loss in pump casing, and at the same time increasing the loss in guide vane. Under design and over-load conditions reducing that distance makes the efficiency of pump and impeller decrease, but the losses in guide vane and pump casing increase. Because reactor coolant pump＇s parameters of the impeller, guide vane and the pump casing are related and influenced, changing the guide vane axial position will influence the coupling-matching characteristics between elements, and then influence the flow state and the energy conversion efficiency of the impeller, guide vane and the pump casing.
出处
《排灌机械工程学报》
EI
CSCD
北大核心
2017年第6期472-480,共9页
Journal of Drainage and Irrigation Machinery Engineering
基金
国家自然科学基金资助项目(51469013)
关键词
核主泵
叶轮
导叶
泵壳
流动状态
reactor coolant pump
impeller
guide vane
pump casing
flow state
