摘要
本文采用SST k-ω湍流模型对环形压水室离心泵和螺旋形压水室离心泵进行了数值模拟,比较了两种泵在设计与非设计工况运行时叶轮所受的径向力,并对两种泵的压力沿叶轮出口分布进行了分析。分析结果发现,当运行在设计工况时,两泵的叶轮受力表现出周期性,螺旋形压水室离心泵的叶轮所受到的径向力相对更大,这是由于受到压水室自身设计和隔舌的影响,使螺旋形压水室离心泵的压力沿叶轮出口分布更加不均匀,从而导致径向力增大。此外,与设计工况相比,两泵在非设计工况运行时叶轮所受径向力更大,且在小流量时所受径向力的周期性与设计工况相比发生显著变化。
Unsteady numerical simulation with SST k-ω turbulent model was carried out to study the centrifugal pumps with different casing's shapes,including semispherical and volute casing.The radial force on the two pumps' impellers was compared at both design and off-design operating conditions.The pressure distribution on the exit of the impeller was also analyzed.The results show that the radial force on impeller was periodical at design operating condition.And the radial force on pump's impeller with volute casing was larger.The design of volute casing and the existence of volute tongue may be the reason why volute casing pump's pressure distribution on the exit of impeller was less uniform.It further led to the increase of the radial force on impeller.In addition,the radial force became larger at off-design operating condition.In particular,the radial force's periodicity at small flow rate condition changed significantly compared with that in design flow rate.
出处
《工程热物理学报》
EI
CAS
CSCD
北大核心
2015年第4期770-774,共5页
Journal of Engineering Thermophysics
关键词
离心泵
压水室形状
径向力
数值模拟
centrifugal pump
casing's shape
radial force
numerical simulation
