| With the continued growth of energy consumption and growing depletion of non-renewable resources, the antinomy between supply and demand of energy is gradually outstanding; meanwhile, during the society produces and people's daily live, the waste of energy is very various, so it is urgent to research and develop the ways and methods on energy conservation. The power consumption on motor for radiator fans inside cooling towers is very large, and there is usually some rich remaining energy in circulating water and it is wasted in most cases. The aim of saving energy can be attained through researching and developing a kind of new type of energy-saving turbine which drive the fans to revolve and make cool.In this paper, based on the ways and methods of designing the classic Banki turbine and Francis turbine, the new type Banki and new type Francis energy-saving turbine (short for the SJN type and HLN type energy-saving turbine) fitting for the working condition in the cooling towers are designed through selecting good parameter.Then the initially designed turbines are predicted on performance with the numerical simulation and the contrast analysis are carried on between the numerical simulation and experiment of optimized SJN type energy-saving turbines. The results are listed on following:Firstly, base on the designing for the components of classic Banki turbine, during the designing of SJN type energy-saving turbine, new velocity coefficient on nozzle intake K1, new coefficient for the height of nozzle coefficients Kb and new coefficient for the velocity of runner are suggested, and the result of optimized comparison proves that the performance of SJN type energy-saving turbine designed with new coefficients is better.Secondly , using RNG k-εmodel the 3D numerical simulation of SJN type energy-saving turbine is completed. By the numerical simulation the water movement in turbine is analyzed and the performance of turbine is predicted, and the analysis and comparison between numerical simulation and experiment are done. The results show that the change rule of the performance of SJN type energy-saving turbine is same in numerical simulation and experiment and the maximum efficiency by numerical simulation is about 2% lower than which by experiment, and the efficiency by numerical simulation in design condition is about 1.5% lower than which by experiment.Thirdly, reference to the means and theories of designing classic Francis turbine, the advanced HLN type energy-saving turbine is successfully developed. Based on the numerical simulation results, the flow is evener in components of HLN type energy-saving turbine than that of SJN type energy-saving turbine, the efficiency of HLN type energy-saving turbine is higher 12% than that of SJN type energy-saving turbine and the HLN type energy-saving turbine is far superior to the SJN type.
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