隔舌圆角对核主泵环形压水室流动特性的影响  

Influences of tongue fillet radius on flow characteristic of annular casing in reactor coolant pump

作　　者：程效锐[1,2] 包文瑞 符丽[1] 

机构地区：[1]兰州理工大学能源与动力工程学院,甘肃兰州730050 [2]甘肃省流体机械及系统重点实验室,甘肃兰州730050

出　　处：《排灌机械工程学报》2017年第9期737-743,共7页Journal of Drainage and Irrigation Machinery Engineering

基　　金：国家自然科学基金资助项目(51469013)

摘　　要：为了研究核主泵隔舌圆角对环形压水室流动特性的影响,以缩比系数为0.4的核主泵模型泵为研究对象,通过改变隔舌圆角大小设计出11种方案,同时在压水室内建立10个截面,并以此表达压水室流场变化规律,通过数值方法对设计工况下不同方案泵内流场进行数值模拟.对模拟结果分析表明:压水室内压力沿主流流动方向先增大后减小,在以出口扩散管中心为起点沿主流流动方向旋转180°处压力最大;在设计工况下,环形压水室水力损失主要产生于以出口扩散管中心为起点沿主流流体流动方向的1/4环形流域内;隔舌圆角对泵性能有一定影响,在设计工况下隔舌圆角大小只对环形压水室性能有影响,对叶轮性能、导叶性能几乎没有影响;随着隔舌圆角增大,环形压水室水力损失先减小后增大,存在极小值使得环形压水室性能最优;R=50 mm时,环形压水室水力损失最小,泵性能最优.研究结果可为环形压水室隔舌圆角的设计提供一定的理论依据.In order to study influences of tongue fillet radius on flow characteristics of annular casing in a reactor coolant pump, 11 annular casings were designed with various tongue fillet radii for a reactor coolant pump model with 0. 4 scaled-down factor. Meanwhile, 10 cross-sections in the annular casings were specified to characterize the flow field for variable fillet radii. The flow fields in the pumps with these casings were simulated under design condition by using CFD method. The results show that the pressure increases until a peak then decreases along the primary flow direction in the annular casing, the peak is achieved at an 180° circumferential angle measured from the center line of the diffuser along the primary flow. Under the design condition, the hydraulic loss in the annular casing is mainly generated in the first quarter annular fluid region starting from the center line of the diffuser. The fillet radius has a certain impact on pump performance, specially, on the hydraulic performance of the ca- sing, and almost fails to influence on the performance of impeller and guide vane. With increasing fil- let radius, the hydraulic loss in the annular casing decreases firstly and then increases, and the mini- mal loss is reached at a radius R = 50 mm. In this case, the hydraulic performance of the casing is the best, and the performance of the pump is optimal. The results can provide a theoretical basis for design of tongue fillet of annular casing.

关 键 词：核主泵 隔舌圆角 环形压水室 流动特性 

分 类 号：S277.9[农业科学—农业水土工程] TH311[农业科学—农业工程]