Numerical Simulation on Cavitation Behavior of Large-Scale Axial-Flow Pumps

doi:10.7652/xjtuxb201411008

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Numerical Simulation on Cavitation Behavior of Large-Scale Axial-Flow Pumps

更新时间：2025-07-09

- Numerical Simulation on Cavitation Behavior of Large-Scale Axial-Flow Pumps
- Vol. 48, Issue 11, Pages: 44-50(2014)
- 作者机构：
  
  武汉大学动力与机械学院,武汉,430072
- 作者简介：
- 基金信息：
- DOI：10.7652/xjtuxb201411008
  CLC： TH311
- Online First：10 November 2014，
  
  Published：2014
- 稿件说明：
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Numerical Simulation on Cavitation Behavior of Large-Scale Axial-Flow Pumps[J]. 2014, 48(11): 44-50.
DOI：

Numerical Simulation on Cavitation Behavior of Large-Scale Axial-Flow Pumps[J]. 2014, 48(11): 44-50. DOI： 10.7652/xjtuxb201411008.

摘要

为了研究大型立式轴流泵内部的空化特性问题

选取幸福泵站中叶轮直径为2.80 m的机组作为研究对象

分别进行了试验研究和数值模拟

计算结果与试验结果相吻合

验证了数值模拟的准确性

得到该泵的汽蚀余量为4.86 m

临界空化压力为48.50 kPa。模拟结果表明:在泵的进口压力从47.00 kPa下降到42.00 kPa的过程中

空化持续长度从0.24迅速变化到1

空化迅速扩散至整个叶片; 当流量大于设计值时

空化只发生在工作面靠近叶片进口边处

而当流量小于设计工况时

空化主要发生在叶片吸力面

且当液流角β'

小于翼型最大厚度处斜率所对应的角度α时

叶片吸力面形成1个空化区域

当β'

大于α时

叶片吸力面将会形成2个空化区域; 当大型轴流泵发生空化时

增大进口压力至临界空化压力以上可以有效消除内部空化现象; 通过调整运行流量至设计流量附近

可以有效减弱泵内部的空化程度。

Abstract

To study the cavitation behavior of large-scale vertical axial-flow pumps

it is necessary to establish accurate prediction methods. In this paper

the real pump with an impeller diameter of 2.80 m in Xing Fu Pumping Station is chosen as the research object. Firstly

through the comparison of numerical and experimental results

the accuracy of numerical simulation is proved. The pump's net positive suction head(NPSH)is 4.86 m

and its critical vapor pressure(P

)is 48.50 kPa. Then changing the pump inlet pressure

the results show that the cavitation last length(χ)is rapidly changed from 0.24 to 1.00 along with the pressure from 47.00 kPa to 42.00 kPa

and the cavitation area quickly spreads to the whole bl

ades. Changing the pump operating conditions

the results show that cavitation only occurs on the working side near the blades' inlet under the large flow conditions

and mainly appears on the suction side of the blades

关键词

Keywords

references

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