摘要
为了研究气液两相条件下,不同导叶出口边安放位置对核主泵内部压力脉动、含气率脉动的影响,并最终找出最佳的导叶出口边安放位置,采用三维数值模拟软件CFX模拟泵内部的瞬态流场,在泵壳内壁面和出口不同位置设置监测点,以了解各模型内部不同时刻、不同位置的压力、含气率分布.对比不同模型相同点的压力脉动、含气率脉动的时域、频域图可以发现:导叶出口边在泵壳中心平面(C-C平面)时,泵壳壁面上各点所受压力较小且较平稳,即压力脉动引起的振动、噪声较小,从安全性方面考虑,此时导叶出口边安放位置最佳;泵壳壁面上的压力脉动主要受叶轮的转动影响;除了类似隔舌处外,叶轮的转动对泵壳壁面和出口含气率脉动的影响不大,沿着液体绕流方向泵壳内壁面上的含气率逐渐增大,到出口达到最大.
To study the influence of different positions of guide vane trailing edge on the pressure fluctuation and gas fraction fluctuation in volute wall of nuclear reactor coolant pump under gas-liquid phase condition,and find a best position of guide vane trailing edge,the three-dimensional numerical software CFX was used to simulate the internal transient flow field of pump,with monitoring points set in different positions,in the hope of learning pressures and gas fraction distributions at different times and different positions within each model pump.By comparing pressure fluctuations,frequency domains and time domains at the same position of each model,it was found that the pressure is lower and steadier when the guide vane trailing edge is in the center plane of volute.In another word,the vibration and noise caused by pressure fluctuation were lower;it is the best position for safety.At the same time,it was also found that the fluctuation frequency of volute wall was influenced by impeller rotation frequency.Except similar tongue,impeller rotation almost has little effect on gas fraction distribution of volute wall and outlet.
出处
《排灌机械工程学报》
EI
北大核心
2013年第6期484-489,共6页
Journal of Drainage and Irrigation Machinery Engineering
基金
"十二五"国家科技支撑计划项目(2011BAF14B04)
江苏省自然科学基金资助项目(BK2011504)
江苏高校优势学科建设工程资助项目
关键词
导叶出口边
核主泵
气液两相
压力脉动
含气率脉动
guide vane trailing edge
nuclear coolant pump
liquid-gas two phase
pressure fluctuation
gas void fraction
