Efficient Design of Ultra-High Specific Speed Centrifugal Pump
In order to study the influence of impeller structural parameters on improving the efficiency of design point of ultra-high specific speed centrifugal pump with ns between 300 and 450,a single-stage single-suction ver-tical centrifugal pump with ultra-high specific speed was taken as the research object.The orthogonal test scheme L9(43)was established by selecting impeller outlet width b2,blade inlet placement angleβ1,blade outlet placement angle β2 and blade envelope angle φ as test factors.The numerical calculation of each scheme model was carried out in the working condition range of 0.9Qn～1.1Qn.The main and secondary sequence of influence of each factor on hydraulic performance were analyzed and summarized,and then the optimal parameter combination of the pump impeller structure was obtained.Finally,the impeller was modified according to the optimal size,and the test results of the external characteristics of the optimized pump were compared with those of the original pump.The results show that:① In high efficiency design,the main and secondary order of structural parameters of ultra-high specific speed centrifugal pump on efficiency is φ→b2→β21,and the main factor affecting hydraulic per-formance is φ;② The optimal horizontal combination of impeller structural parameters in high efficient design is determined;③ After optimization,the pump efficiency of the design point is increased by about 4.2％compared with the original pump,and the high efficiency zone is expanded to 0.75Qn～1.1 Qn,and the overall efficiency is increased by more than 2.5％;④ The optimized pump shaft power under 0.75Qn～1.2Qn condition is reduced by 5.8％～15.8％compared with the prototype,which is conducive to energy saving and emission reduction.
ultra-high specific speed centrifugal pumpoptimization designorthogonal testhigh efficiency zone
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