摘要
为研究高速部分流泵内部由于叶轮和蜗壳之间动静干涉作用引起的压力脉动的机理,采用计算流体动力学软件Fluent中的滑移网格技术,对该泵在3种工况下(0.5Q0,1.0Q0,1.5Q0)的整机进行非定常数值模拟,捕捉到3个不同时刻不同流量下的蜗壳区中间截面的静压分布图,并对蜗壳内壁面设置的9个监测点速度以及静压进行快速傅里叶变换,得到压力脉动的时域和频域图.模拟结果表明:在相同流量下,各流道内的静压随着时间改变不大;在同一时刻,随着流量的增大静压变大;压力脉动呈周期性变化,且随着流量的增大,幅值也增大;在0.5Q0的工况时,监测点4的幅值最大且振动最为剧烈;在设计工况和大流量时,监测点5的压力幅值最大,且各个监测点频域幅值随流量的增大而逐渐增大,这表明流量对高速部分流泵的振动有极大的影响,且喷嘴区域的振动最为严重.
In order to research the mechanism of pressure fluctuation that were caused by the impeller-volute interaction of a high-speed partial emission pump,a numerical simulation of unsteady flow was carried out by applying the sliding mesh technique in computational fluid dynamics software Fluent on the whole pump under three working points of 0.5Q0,1.0Q0 and 1.5Q0,respectively.The static pressure distribution of volute was recorded at three different times and flow rates,and the time and frequency domain of pressure fluctuation of 9 monitoring points in the inner wall of volute were analyzed by fast Fourier transform for velocity and pressure.The simulation results show that static pressure has not much change over time at the same flow rate.At the same time,the static pressure increases with flow rate.The pressure fluctuation has a cyclic variation,and the amplitude value decreases with increasing of the flow rate.The amplitude value of monitoring point 4 is biggest at the small flow rate condition,but the amplitude value of monitoring point 5 is biggest at the design and large flow rate conditions.The frequency amplitude value increases with increasing of the flow rate.It illustrates that the flow rate has a great impact on vibration of high-speed partial emission pump,and this phenomenon is particularly serious in the nozzle region.
出处
《排灌机械工程学报》
EI
2011年第4期303-306,共4页
Journal of Drainage and Irrigation Machinery Engineering
基金
安徽省科技攻关计划项目(08102303)
关键词
高速部分流泵
非定常流动
压力脉动
频域图
静压
high-speed partial emission pump
unsteady flow
pressure fluctuation
frequency domain
static pressure
