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| PIV orthogonal measurement for internal flow pattern within centrifugal pump impeller |
| Zhou Zhengfu1, Chen Songshan2, He Zhongning1 |
| 1.College of Hydraulic Science and Engineering, Yangzhou University, Yangzhou, Jiangsu 225009, China; 2.School of Energy and Power Engineering, Yangzhou University, Yangzhou, Jiangsu 225127, China |
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Abstract According to orthogonal test requirements, nine low specific speed centrifugal impellers with deviated splitter vanes were designed and manufactured. The orthogonal factors are the splitter vane suction diameter(D′), the inlet deviated angle(θ1)and the outlet deviated angle(θ2). Each factor takes 3 levels. Under the design speed(1 250 r/min), the internal dynamic flow patterns inside each impeller have been measured using PIV system under 4 different operating modes. The characteristics and the distribution pattern of the relative velocity vector field in the impeller were revealed. The results show that the flow in the impeller is asymmetric and non-uniform. Specifically, relative flow velocity near the suction surface is higher than that near the pressure surface. The relative velocity near the suction surface is increasing along the forward direction, while that near the pressure surface is decreasing. There is a high-velocity zone at the front suction surface(inlet)and a low-speed one at the front pressure surface(inlet). The deviated splitter vanes shapes and locations have a significant influence on the flow field inside the impeller. There are large differences between different schemes. When D′ is moderate, θ1 is bigger and θ2 is suitable, the flow field inside the impeller is better. The law revealed in the overall characteristic test is also similar with the PIV test.
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Received: 24 November 2012
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