Abstract
A high specific speed centrifugal pump is used in the situation of large flow and low head. Centrifugal pump parameters need to be optimized in order to raise its head and efficiency under off-design conditions. In this study, the orthogonal experiment design method is adopted to optimize the performance of centrifugal pump basing on three parameters, namely, blade outlet width b2, blade outlet angle β2 and blade wrap angle φ. First, the three-dimensional model of the centrifugal pump is established by CFturbo and SolidWorks. Then nine different schemes are designed by using orthogonal table, and numerical simulation is carried out in CFX15.0. The final optimized combination of parameters is b2 = 24 mm, β2 = 24°, φ = 112°. Under the design condition, the head and efficiency of the optimized centrifugal pump are appropriately improved, the increments of which are 0.74 m and 0.48%, respectively. However, the efficiency considerably increases at high flow rates, with an increase of 6.9% at 1.5 Qd. The anti-cavitation performance of the optimized centrifugal pump is also better than the original pump. The results in this paper can provide references for parameter selection (b2, β2, φ) in the centrifugal pump design.
Highlights
High specific speed centrifugal pumps with low head and large flow are generally used in rural irrigation, urban drainage, fish pond aquaculture, aerospace engineering, etc
1 mm, thebyblade outlet angle decreases by three degrees and the blade wrap angle decreases by eight eight degrees
Three impeller parameters are selected for orthogonal design experiments, and the Fraction optimal combination of parameters is obtained according to the results of numerical simulation
Summary
High specific speed centrifugal pumps with low head and large flow are generally used in rural irrigation, urban drainage, fish pond aquaculture, aerospace engineering, etc. There are two ways to optimize the performance of centrifugal pump. One is to study the effect of a single parameter or structure on the performance of centrifugal pump. Skrzypacz and Bieganowski [5] studied the influence of micro grooves on centrifugal pump performance by numerical simulation and experiment. The results illustrated that micro-blades can make the velocity distribution in the impeller passage more uniform, which improves the head and efficiency of the pump. Chen, He and Liu [6] put forward the concept of twisted vice blade, and verified that the use of twisted vice blades can effectively improve the comprehensive performance of centrifugal pumps. Fukutomi, and Fujiwara [7] found the influence of blade outlet angle on radial thrust and modeled components
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