Abstract
The structural design parameters of a plastic centrifugal pump were calculated and modeled, and flow field simulation analysis of the model was performed using CFD, in the framework of an orthogonal design method (or experiment). The inlet mounting angle β1, outlet mounting angle β2, wrap angle ϕ, and impeller inlet diameter D1 of the pump impeller were the four factors assumed for the application of the orthogonal experiment, using the efficiency and Net Positive Suction Head (NPSH) as evaluation indices. Moreover, taking the maximum efficiency and minimum NPSH of the plastic centrifugal pump as the evaluation factors, the parameters of the pump impeller were re-optimized through the Taguchi algorithm (leading to the following optimal combination: inlet diameter 35 mm, inlet angle 26°, outlet angle 27°, and wrap angle 110°). The minimum NPSH and the maximum efficiency have been found to be 0.957% and 61.5%, respectively.
Highlights
Plastic centrifugal pumps are widely used because of their strong suction capacity, low working noise, and leak-proof construction
The unreasonable structural design of some areas may bring serious harm to pumps’ operation, which hinders the development of plastic centrifugal pumps
In literature [7], in order to study the influence of the blade wrap angle on the hydraulic characteristics of a double volute centrifugal pump, numerical simulations were used to study the external characteristics, internal flow field, the pulsation inside the volute at different wrap angles, followed by hydraulic performance experiments
Summary
Plastic centrifugal pumps are widely used because of their strong suction capacity, low working noise, and leak-proof construction. With an ultra-low specific speed centrifugal pump as the subject, based on the experimental results of the pump, seven impellers with different effective cross-sectional area ratios of the inlet and outlet of the impeller channel were constructed, and a complete geometric model including front and rear pump chambers and sealing rings was constructed. With the help of CFD, the influence of different inlet and outlet area ratios on the performance and flow field structure distribution of the ultra-low specific speed centrifugal pump was analyzed. In literature [7], in order to study the influence of the blade wrap angle on the hydraulic characteristics of a double volute centrifugal pump, numerical simulations were used to study the external characteristics, internal flow field, the pulsation inside the volute at different wrap angles, followed by hydraulic performance experiments. With the maximum efficiency and minimum NPSH as the evaluation indices of the combination parameters, the Taguchi algorithm was used to optimize the parameters of the analysis results; the optimal combination parameter with the maximum efficiency and minimum NPSH were obtained
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