摘要
为了研究漩涡泵内部流场对其外特性的影响,采用RNGk-ε湍流模型和结构化网格技术对漩涡泵内部非定常流动进行数值模拟计算。结果表明,漩涡泵流道内压力变化呈直线分布;流道内纵向漩涡随流量的增大而减小,径向漩涡周期性地脱离叶片被液流带走且随着时间增加而增大;设计工况下,各监测点处压力脉动变化呈周期性分布,从流道进口到出口压力脉动幅值逐步增大;不同工况下,叶片通过频率是压力脉动的主频,其对应的压力脉动幅值随流量增大而增大。
In order to study the vortex pump flow field characteristics of its external,it is necessary to carry out unsteady flow numerical simulation by using RNG k-ε turbulence model and structured grid inside the vortex pump.The results showed that the pressure changes within the linear distribution,with flow rate increasing,longitudinal vortex flow decreased,while the radial vortex flow periodically was removed from the leaves and increased with time.The pressure fluctuation at the different monitoring points was changed periodically at design condition.The pressure pulse amplitude increased from the entrance to the exit gradually.The blade passing frequency was dominative in the pressure fluctuation.With the flow rate increasing,pressure fluctuation was more obvious under the blade passing frequency.
出处
《农业机械学报》
EI
CAS
CSCD
北大核心
2011年第1期44-48,共5页
Transactions of the Chinese Society for Agricultural Machinery
基金
国家自然科学基金资助项目(50509009)
"十一五"国家科技支撑计划资助项目(2008BAF34B10)
关键词
漩涡泵
数值模拟
压力脉动
湍流模型
Vortex pump
Numerical simulation
Pressure fluctuation
Turbulence model
