摘要
为研究惰转过程核主泵内部的流动规律,应用数值模拟的方法对核主泵内部流场进行计算,得到不同惰转流量时间(T_(Qi))下叶轮流道内压力脉动的时频特性.对叶轮压力脉动进行小波变换分析,并采用第二代涡识别方法Q准则对不同工况下各过流部件进行涡识别.研究结果表明:在惰转过程中,惰转初期压力脉动系数最大变化发生在导叶中部,随后最大变化率发生在叶轮与导叶的动静交界面,最后压力脉动变化趋于稳定;随着叶轮转速和流量逐渐减小,导叶做功区域向出口附近转移;隔舌部位由于结构特殊所受冲击较大,附近有回流产生,并有向流道中部扩散的迹象;压力脉动趋于稳定值,主要频率向低频转移,各部件流道内压力脉动规律性逐渐被破坏,其中导叶流道规律性变化趋势较为平缓;流道内的部分强涡区域呈现分离脱落迹象,并且数量逐渐减少;压水室内的涡核主要集中于左侧,与叶轮旋转方向有关.研究可为核主泵在惰转特性优化设计提供一定理论支撑.
In order to study the flow law in the reactor coolant pump during idling process,the numerical simulation method was used to calculate the internal flow field of the reactor coolant pump,and the time-frequency characteristics of pressure pulsation in the impeller channel with different idling flow time(T Qi)were obtained.The pressure pulsation of the impeller was analyzed by wavelet transform,and the vortex identification of the flow components under different working conditions was carried out by using the second generation vortex identification method Q criterion.The results show that the maximum change of pressure fluctuation coefficient occurs in the middle of the guide vane at the initial stage of idling process,then the maximum change rate occurs at the dynamic and static interface between the impeller and the guide vane,and finally the pressure fluctuation tends to be stable.With the decrease of impeller speed and flow rate,the work area of the guide vane moves to the vicinity of the outlet.Due to the special structure,the tongue part is greatly impacted,and there is backflow nearby,meanwhile there is a sign of diffusion to the middle of the flow channel.The pressure pulsation tends to be stable,and the main frequency shifts to the low frequency.The pressure pulsation regularity in the flow channel of each component is gradually destroyed,and the change trend of the guide vane flow channel is relatively gentle.Some of the strong vortex regions in the channel indicates of separation and shedding,and the number gradually decreases.The vortex core in the pumping chamber is mainly concentrated on the left side,which is related to the rotating direction of the impeller.The research can provide some support for the optimization design of the idling characteristics of the reactor coolant pump.
作者
刘安林
叶道星
罗逸民
陈俊霖
余波
赖喜德
吴锦琛
翟凤丽
LIU Anlin;YE Daoxing;LUO Yimin;CHEN Junlin;YU Bo;LAI Xide;WU Jinchen;ZHAI Fengli(School of Energy and Power Engineering,Xihua University,Chengdu,Sichuan 610039,China;Key Laboratory of Fluid and Power Machinery,Ministry of Education,Chengdu,Sichuan 610039,China;Sichuan Key Laboratory of Fluid Machinery and Engineering,Chengdu,Sichuan 610039,China)
出处
《排灌机械工程学报》
CSCD
北大核心
2023年第11期1088-1095,1103,共9页
Journal of Drainage and Irrigation Machinery Engineering
基金
四川省科技厅科技计划项目(2022YFN0026)
四川省“双一流”学科建设项目(RC1900009750)
德阳市开放式校市合作技术研发资助项目(2018CKJ020)
西华大学研究生创新基金资助项目(SA2000002920,ycjj2020107)。
关键词
核主泵
惰转过程
压力脉动
小波变换
Q准则
数值模拟
reactor coolant pump
idling process
pressure pulsation
wavelet transform
Q criterion
numerical simulation
