Energy Characteristic Analysis and Optimization of Impeller of Shaft Tubular Pump
The impeller is the core component of the energy conversion of the shaft tubular pump,and the energy characteristics of the shaft tubular pump can be effectively improved by improving the geometry of the impeller.Based on the RANS equation and RNG k-ε turbulence model,the energy characteristics and head-flow relationship of the impeller part and the whole machine of the prototype shaft tubular pump were calculated and analyzed under 9 different flow conditions from 0.6Q to 1.3Q,and the curves of the impeller and machine efficiency with flow rate were obtained,and the models before and after the optimization design were calculated and compared.Under the small flow condition,the efficiency of the whole machine has the same level of change with the impeller efficiency,and there are mainly eddy current losses.Under the large flow condition,the efficiency of the whole machine decreases more than the impeller with the increase of flow,and there are mainly impact losses and friction losses.The change of impeller blade wrap angle can not only make the efficiency curve shift,but also make the head curve deflection.When the flow gradually increases,the large package angle impeller efficiency performance gradually to the good,impeller head decline amplitude is also accelerated.As the flow decreases,the small package angle impeller performance is better,the impeller head rise amplitude increase.
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