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| Experiment research on inlet flow field for axial-flow pump at unsteady operating condition |
| Yang Hua1, Sun Dandan1, Tang Fangping1, Zhang Xuefeng2 |
| (1.College of Energy and Power Engineering, Yangzhou University, Yangzhou, Jiangsu 225009, China; 2.Administration Bureau of Hanzhuang Water Conservancy, Jining, Shandong 277600, China ) |
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Abstract The operating region of axialflow pumps is greatly reduced due to the existence of unstable operating range at low flowrate condition. The energyperformance of an axialflow pump was measured in detail, and headflow curve with bi-saddle was obtained. Particle image velocimetry (PIV) technology was used to measure the twodimensional flow fields at the inlet axial plane under the flow rate of 0.73Qd, 0.55Qd, 0.43Qd and 0.33Qd. The experiment results show that backflow exists at the impeller inlet close to the wall, and the backflow zone increases with the decreasing of flow rate. With the decreasing of the flow rate, the turbulence intensity obviously increases, the turbulence intensity of axial velocity is higher than one of radius velocity and the turbulence intensity near the case wall is much higher close to the hub. The flow at the inlet wall evolutes from axial direction to circumferential direction can be seen clearly by the silk lines. The experimental results indicate that the lower performance of axial flow pump at the low flow rate condition is due to the unstable flow at the inlet impeller. This provides a reference for further improvement of axialflow pumps performance at low flow rate condition.
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Received: 13 May 2011
Published: 30 September 2011
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