Abstract
In order to determine the optimal structural parameters of a plastic centrifugal pump in the framework of an orthogonal-experiment approach, a numerical study of the related flow field has been performed using CFX. The thickness S, outlet angle β2, inlet angle β1, wrap angle, and inlet diameter D1 of the splitter blades have been considered as the variable factors, using the shaft power and efficiency of the pump as evaluation indices. Through a parametric analysis, the relative importance of the influence of each structural parameter on each evaluation index has been obtained, leading to the following combinations: β1 19°, β2 35°, S 2 mm, wrap angle 154°, and D1 85 mm (corresponding to the maximum efficiency of 75.48%); β1 19°, β2 20°, S 6 mm, wrap angle 158°, and D1 81 mm (corresponding to the minimum shaft power of 75.48%). Moreover, the grey correlation method has been applied to re-optimize the shaft power and efficiency of the pump, leading to the following optimal combination: β1 19°, β2 15°, S 4 mm, D1 81 mm, and wrap angle 152° (corresponding to the maximum efficiency of 71.81% and minimum shaft power of 2.187 kW).
Highlights
In recent years, pumps have been used in various industries, becoming the second most popular machinery [1]
Cheng et al [22] carried out a numerical simulation of the pump in the framework of the calculation model based on the Reynolds time average N-S equation, the RNG k-ε turbulence method and the SIMPLE algorithm, and evaluated the effects of different guide vane wrap angles on the pump performance, the internal loss of the guide vane and the guide vane
The results show that the wrap angle has a significant effect
Summary
Pumps have been used in various industries, becoming the second most popular machinery [1]. Cheng et al [22] carried out a numerical simulation of the pump in the framework of the calculation model based on the Reynolds time average N-S equation, the RNG k-ε turbulence method and the SIMPLE algorithm, and evaluated the effects of different guide vane wrap angles on the pump performance, the internal loss of the guide vane and the guide vane. Tian et al [23] considered the four geometric parameters of the impeller’s inlet diameter, inlet width, number of blades and blade angle, and designed the L9 (34) experimental table, calculated the lift and efficiency of the 9 design schemes under the rated flow, and adopted the range The analysis method is used to process and an optimized model is obtained.
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