摘要
为了研究入流条件对轴流式核主泵性能的影响,采用SST k-ω湍流模型,分别对直管入流和弯管入流两种条件下的轴流式核主泵进行了多工况全流场三维瞬态数值计算。计算结果表明:弯管入流对核主泵外特性及内流场结构均产生了明显的影响,在各个工况点,相比于直管入流,弯管入流条件下主泵扬程和效率均明显下降,且越接近设计工况降幅越大,而轴功率变化极小。弯管入流时产生的离心力和惯性力使得压力和速度产生了不均匀分布,导致主泵进口产生了对称涡流,二次流严重破坏了主泵叶轮入口流场的均匀性,从而导致主泵水力性能衰减。根据出口压力脉动计算结果,这种弯管在一定程度上改善了主泵出口的压力脉动特性,相较于进口直管的出口流场更加稳定。
In order to study the effect of inflow conditions on the performance of axial-flow main coolant pump,the three-dimensional transient numerical calculation of the full flow field of axial-flow main coolant pump under two conditions of straight and curved flow was carried out by using SST k-ωturbulence model.The calculation results show that the elbow inflow has a significant impact on the external characteristics and internal flow field structure of the main coolant pump.Compared with the straight pipe inflow,the head and efficiency of the main coolant pump under the elbow inflow condition are significantly reduced at each working condition,and the greater the drop is as the design condition approaches,while the shaft power changes little.The centrifugal force and inertia force generated during the flow of the bent pipe make the pressure and speed produce uneven distribution,resulting in the symmetrical eddy current at the inlet of the main coolant pump,and the secondary flow seriously destroys the uniformity of the flow field at the inlet of the main coolant pump impeller,resulting in the hydraulic performance of the main coolant pump.According to the calculation results of outlet pressure fluctuation,the bend pipe improves the pressure fluctuation characteristics of the main coolant pump outlet to a certain extent,and the outlet flow field is more stable than that of the inlet straight pipe.
作者
杨从新
尹皓
崔昊宇
陈孝炎
YANG Cong-xin;YIN Hao;CUI Hao-yu;CHEN Xiao-yan(School of Energy and Power Engineering,Lanzhou University of Technology,Lanzhou 730050,China)
出处
《液压气动与密封》
2025年第8期8-16,共9页
Hydraulics Pneumatics & Seals
基金
国家自然科学基金(5186609)。
关键词
轴流式核主泵
非均匀入流
压力脉动
数值模拟
axial-flow main coolant pump
non-uniform inflow
pressure fluctuation
numerical simulation
