Distribution of unsteady pressure in volute type axial flow pump

Journal of Vibroengineering

Cao Weidong¹  Zhang Qian¹  Yao Lingjun¹ 

[1] National Research Center of Pumps, Jiangsu University, Zhenjiang, Jiangsu, 212013, China;

关键词: axial flow pump;    pressure fluctuation;    time frequency characteristics;    radial force;    and axial force;   

DOI  :  10.21595/jve.2018.18870

来源: DOAJ

【 摘 要 】

In order to study the distribution of unsteady pressure in volute type axial flow pump, the k-ε turbulence model was applied, and ANSYS CFX was provided for numerical simulation calculation. Experiments of external characteristics and pressure fluctuation have been done to verify the results of numerical simulation. The results show that under the design operating condition, the main fluctuation frequencies in the volute, at the inlet and outlet of the impeller are the blade passing frequency. The amplitudes of fluctuation at the inlet of the impeller decrease gradually from the rim to the hub, while those at the export decrease firstly and then increase, the amplitudes at the tongue are much higher than that at other sections of the volute. Under the off-design operating conditions, the main fluctuation frequency at the inlet and outlet of the impeller is still the blade passing frequency, while that at the tongue is between the twice shaft frequency and the blade passing frequency, fluctuation amplitudes are both larger than those under the design operating condition. Under the design operating condition, the radial force on the impeller is the minimum, however, the axial force increases with the increase of flow rate. The distributions of unsteady pressure in volute type axial flow pump are different with general centrifugal or axial flow pump.

【 授权许可】

Unknown