摘要
以轴流泵优秀水力模型为研究对象,考虑各管段的实际安装尺寸,流体域用结构网格离散,并选用标准k-ε湍流模型,进行全流场的定常和非定常计算。监测非定常计算时叶轮进口、叶轮出口、导叶中间和导叶出口处的压力脉动值。结果表明预测所得到的结果与试验结果吻合较好。对不同转速下轴流泵压力脉动特性沿径向的分布规律进行统计和分析,发现当转速发生变化时,压力脉动混频幅值的均方根值(RMS)沿径向变化规律也发生了变化。从频域图可知,在叶轮出口,流道的中间和靠近轮毂区域出现较大分频幅值(即各频率分量所对应的幅值);在导叶出口,流道中间测点的分频幅值相对较高,靠近轮毂区域和流道外缘的测点分频幅值相对较低。
Considering actual mounting dimension of each pipe section,the steady and unsteady total flow field was calculated based on the excellent hydraulic model of axial flow pump.Fluid domain was discretized with structured mesh and analyzed with standard turbulence model.Pressure fluctuation values of impeller inlet,impeller outlet,middle of the guide vane and guide vane outlet were monitored.It turned out that prediction results were in good agreement with the experimental results.Radial distribution of pressure fluctuation for axial flow pump at different rotation speeds was investigated,and the results showed that the distribution of RMS along the radius also changed when the rotation speed varied.In terms of frequency domain chart,at the inlet of impeller,large amplitude of sub-harmonic emerged in the middle of the passage and near the hub; while at the guide vane outlet,amplitude of subharmonic of the monitor point in the middle of passage was relative higher and amplitude of sub-harmonic was relative lower near the hub and passage outer edge.
出处
《农业机械学报》
EI
CAS
CSCD
北大核心
2013年第S1期119-124,共6页
Transactions of the Chinese Society for Agricultural Machinery
基金
国家自然科学基金资助项目(51079063
51109093)
"十二五"国家科技支撑计划资助项目(2011BAF14B00)
关键词
轴流泵
压力脉动
转速
幅值特性
频谱特性
Axial flow pump Pressure fluctuation Revolving speed Amplitude characteristics Spectral characteristics
