西华大学学报（自然科学版）2020，Vol.39Issue(5)：74-83,10.DOI:10.12198/j.issn.1673-159X.0007
混流式核主泵压力脉动特性预测与分析
Prediction and Analysis of Pressure Pulsation Inside a Mixed-flow Diffuser Reactor Coolant Pump
摘要
Abstract
The pressure pulsation inside reactor coolant pump (RCP) is much more complex than that inside a general mixed-fow pump due to its structure and actual operating conditions. It is necessary to un-derstand the pressure pulsation behavior and figure out its characteristics at different operating conditions in order to meet the requirements of high reliability and safety in both design and operation phases. To seekthe relationship between the pressure pulsation characteristics and operating conditions, pressure pulsation behavior inside the impeller and guide vanes was carefully investigated by using 3D transient flow simula-tions of the completed pump at 5 operating conditions, and the time-domain and frequency-domain charac-teristics of pressure pulsation at different locations inside the RCP were analyzed. It has been shown that the dominant frequency of pressure pulsation is mainly governed by the blade-passing frequency(BPF) due to rotor-stator interaction (RSI) between the impeller blades and guide vanes at all operating conditions, and the amplitude of pressure pulsation mainly depends on the operating discharges and reaches the smallest level in the design operating condition. For an RCP with spherical casing, the amplitude of pressure pulsa-tions inside the impeller increases from inlet to outlet, which reaches the maximum value between the im-peller and guide vanes, and then decreases from inlet to outlet of guide vanes. The behavior of pressure pulsations at the inlet of the impeller in circumferential direction is not the same and the pulsations are more intensive on the suction side than that of a blade at different operating conditions. But it is almost the same at the outlet of the impeller as the interaction between the impeller and guide vanes. Due to geometric fea-tures of the spherical casing, the vortex flow inside the spherical casing leads to the highly irregular and un-steady pressure pulsations inside flow channel of the impeller and diffusers under smaller discharge operat-ing conditions, and the amplitude of pressure pulsations in higher frequencies increases with the decreasing of the operating discharge. The amplitude of pressure pulsation inside the whole flow channel distinctly in-creases when the RCP is operating at extreme small discharge. The spherical casing does has influence on the pressure pulsation inside the impeller and guide vanes, the effect is great under small discharge operat-ing conditions but is relatively poor inthe design and large discharge operating conditions.关键词
核主泵/压力脉动/球形压水室/导叶式混流泵/变流量工况Key words
reactor coolant pump/pressure pulsation/spherical casing/mixed-flow diffuser pump/varying discharge operating conditions分类
机械制造引用本文复制引用
赖喜德,叶道星,陈小明,衡亚光..混流式核主泵压力脉动特性预测与分析[J].西华大学学报（自然科学版）,2020,39(5):74-83,10.基金项目
四川省科技计划资助项目(2020ZHCG0018,2019YJ0451,2017JY0047) （2020ZHCG0018,2019YJ0451,2017JY0047）
2020年四川省工业发展资金项目. （）
