径向导叶对高速离心泵非定常流动影响的分析

发布时间：2018-03-11 01:11

本文选题：高速离心泵-　切入点：径向导叶-　出处：《热能动力工程》2017年04期 　论文类型：期刊论文

【摘要】：应用计算流体力学技术对带导叶与不带导叶高速离心泵的内部流场进行定常及非定常数值模拟,从而预测出带导叶与不带导叶两种方案下的外特性曲线走势情况。同时得到了流体流经关键位置时在不同工况下的压力脉动情况,并对相应的时域图及频域图进行了对比分析。结果表明,带有导叶的高速离心泵相比于无导叶离心泵扬程较高,扬程曲线更加平缓,同时在大流量工况下,高速离心泵效率更高也更稳定。从时域图分析,不同工况下两种方案中的高速离心泵压力脉动存在明显的周期性,其中带有导叶的高速离心泵在大流量工况下压力脉动幅值相对较小,不带导叶的高速离心泵在小流量下压力脉动幅值相对较小;从频域图分析看,两种方案中的高速泵都是在一倍叶频处存在较大峰值,即动静干涉作用是引起压力脉动的主要因素,同时通过对比,在不同工况下带有导叶的高速离心泵在二倍叶频处峰值较小,说明添加径向导叶对缓解动静干涉起到一定作用。通过比较不同方案下监测点压力脉动平均值及峰值曲线图,说明在高速泵中加装径向导叶可以有效地发挥扩压作用,降低液流速度,充分将速度能转化为压能。结合上述结论,可以得出带导叶高速离心泵适合在大流量高工况下运行,如消防灭火,石油化工,航空航天等领域。
[Abstract]:The steady and unsteady numerical simulation of internal flow field of high-speed centrifugal pump with and without guide vane is carried out by using computational fluid dynamics technology. The trend of the external characteristic curve of the two schemes with and without the guide vane is predicted, and the pressure pulsation of the fluid passing through the critical position is obtained. The results show that the head of high-speed centrifugal pump with guide vane is higher than that of non-guide vane centrifugal pump, and the lift curve is more smooth, and at the same time, under the condition of large flow rate, the head curve of the centrifugal pump with guide vane is higher than that of the non-guide vane centrifugal pump. High speed centrifugal pump is more efficient and more stable. From the analysis of time domain diagram, the pressure pulsation of high speed centrifugal pump under different working conditions has obvious periodicity. The pressure fluctuation amplitude of high speed centrifugal pump with guide vane is relatively small under the condition of large flow rate, and that of high speed centrifugal pump without guide vane is relatively small at small flow rate. In the two schemes, the high speed pump has a large peak value at the frequency of twice the blade, that is, the static and static interference is the main factor that causes the pressure pulsation, at the same time, through the comparison, The peak value of high speed centrifugal pump with guide vane in different working conditions is small at the frequency of double blade, which shows that adding diameter guide vane plays a certain role in alleviating static and static interference. By comparing the mean value and peak value curve of pressure pulsation at monitoring point under different schemes, It is shown that adding the diameter guide vane to the high speed pump can effectively play the role of diffuser, reduce the liquid flow velocity, and fully convert the velocity energy into pressure energy. Combined with the above conclusions, it can be concluded that the high speed centrifugal pump with guide vane is suitable for running under the condition of high flow rate and high working condition. Such as fire fighting, petrochemical, aerospace and other fields.
【作者单位】：西华大学能源与动力工程学院;School
【基金】：西华大学流体及动力机械教育部重点实验室开放基金资助项目(szjj2015-037);西华大学研究生创新基金资助项目(ycjj2015160)
【分类号】：TH311

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