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| Numerical simulations and PIV experiment of flow field in axial flow pump |
| Shi Weidong, Shao Peipei, Zhang Desheng, Zhang Hua |
| National Research Center of Pumps, Jiangsu University, Zhenjiang, Jiangsu 212013, China |
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Abstract In order to study the applicability of a turbulence mode for performances of an axial flow pump, the standard k-ε,RNG k-ε,SST k-ω models and large eddy simulation(LES)method were used. Based on the structured hexahedral and mesh slip technology, the performance prediction and numerical simulation of model axial flow pump with impeller diameter of 200 mm and nominal speed of ns=700 were carried out. The obtained head and efficiency of pump were analyzed and compared with the experimental results. The simulation and the experiment results show that all three models give satisfactory predictions of external characteristics in the operating condition and the result of RNG k-ε is relatively ideal, but different models have different characteristics when at off-design conditions. PIV measurement is performance for the axial clearance between the impeller and guide vane at 0.8Qopt,1.0Qopt and 1.2Qopt. Numerical simulated results for all four models are compared with the results from PIV measurement in the same areas. The streamlines for three models based on Reynolds time-ave-raged equations are found to be in a good agreement with PIV results, indicating the accuracy and vali-dity of the numerical simulation. But there is a certain deviation between the calculation results of LES and PIV results. Moreover, the flow features for different flow rates were analyzed.
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Received: 10 October 2014
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