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Design of new type diffuser of plastic well pump and pulsation characteristics of internal pressure |
XU Yuanhui, ZHANG Qihua, SHI Weidong, LU Weigang, WANG Chuan, ZHOU Ling |
National Research Center of Pumps, Jiangsu University, Zhenjiang, Jiangsu 212013, China |
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Abstract A new type axial diffuser is devised and the unsteady, three-dimensional and turbulent flow field in a plastic well pump with this diffuser is simulated based on a CFD method to exploit the internal pressure pulsation phenomenon in the diffuser. The pulsation characteristics of pressure at the first and second stage impeller outlets as well as inside the first and second stage diffuses are obtained under the duty flow rate conditions; meanwhile, the frequency fluctuation of pressure is analyzed by fast Fourier transform. Compared with a bowl diffuser, the hydraulic performance of the axial diffuser is slightly poorer, but much better than a radial diffuser. The maximum pressure pulsation occurs at the interface between the impeller and the axial diffuser, and the magnitude of the pulsation declines when the fluid passes the diffuser. From the inlet to the outlet, the amplitude of pressure pulsation in the axial diffuser is significantly reduced, indicating an excellent pressure recovery capability. In addition, the amplitude of pressure pulsation in the second stage diffuser is lower than that in the first stage. The dominant frequency at various monitoring points is equal to the blade passing frequency or is an integer multiple of the frequency. There are some differences in the frequency domain distribution from the first stage diffuser to the second stage one.
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Received: 02 March 2015
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