Hydraulic performance of guide vane mixed-flow pump based on loading distribution
SU Shaohua1,2, LIU Zhuqing1,2*
1.College of Water Resources and Civil Engineering, China Agricultural University, Beijing 100083, China; 2.Beijing Engineering Research Center of Safety and Energy-saving Technology for Water Supply Network System, Beijing 100083, China
Based on the three dimensional inverse design method, a new option to achieve a higher hydraulic efficiency was made by optimizing the blade loading and the guide vane loading combined with the CFD method. In the traditional design method, only after the completion of a design can we get the blade surface pressure distribution, post-processing to get through the CFD method, while the pressure distribution has a very important effect on the efficiency. However, through the control of blade loading distribution with the inverse design method, we can achieve the goal of controlling blade shape directly.The CFD results showed that the hydraulic efficiency was higher when the top loading was in the middle and a bit closer to the inlet of the impeller.By comparing the optimized model with the conventional model, the hydraulic efficiency was increased by 3.56%,which improved the flow uniformity and the jet-wake phenomenon at the same time. Unsteady calculation results showed that the pressure fluctuation had a high value at the inlet of the impeller of both the conventional model and the optimize model,which had a great influence on the steady of the stability of operation. However, the pressure pulsation amplitude at the impeller inlet and the outlet of the guide vane get better by the 3-D inverse design method for reasons of better blade loading distribution. The vortex in the aft part of the guide vane disappears in the inverse-method design model because of the improvement of the jet-wake in the impeller, which leads to a better flow character in the guide vane flow zon, thus helping to get good hydraulic efficiency.
BING Hao,CAO Shuliang,TAN Lei.Mixed flow pump impeller design of forward and inverse problem of iterative method [J]. Journal of drainage and irrigation machinery engineering,2011, 29(4): 277-281, 302.(in Chinese)
GOTO A, TAKEMURA T, ZANGENEH M. Suppression of secondary flows in a mixed-flow pump impeller by application of three-dimensional inverse design method: part 2—experimental validation [J]. Journal of turbomachinery, 1996,118(3):544-551.
BONAIUTI D,ZANGENEH M,AARTOJARVI R,et al.Parametric design of a waterjet pump by means of inverse design,CFD calculations and experimental analyses[J].Journal of fluids engineering,2010,32(3): 104-118.