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9 results on '"Khoeini, Davood"'

1. Flow characteristics of a centrifugal pump with different impeller trimming methods

Author

Khoeini Davood and Tavakoli Mohammad Reza

Subjects
centrifugal pump, impeller trimming, different methods, flow characteristics, experimental and numerical investigation, Engineering (General). Civil engineering (General), TA1-2040, Mechanics of engineering. Applied mechanics, TA349-359
Abstract

Influences of different impeller trimming methods on flow characteristics of a centrifugal pump have been studied numerically and experimentally in this research. Different cases of trimmed impellers include straight trimmed impeller with and without remained shrouds, oblique trimmed impeller, triangular trimmed impeller, semi-circular trimmed impeller and polygon-shaped trimmed impeller. Verification of computational results has been investigated through comparison of experimental and numerical data as maximum deviation of 5.4 per cent has been observed. Results revealed that impeller trimming method has profound impact on the centrifugal pump performance as the highest head value has been achieved by employing the impeller with polygon-shaped trimmed shrouds at all flow rates, which is by 5 per cent higher than that of the conventional trimmed impellers (straight trimmed ones). Furthermore, it is also seen that the efficiency of polygon-shaped trimmed impeller was reduced by 3.6 per cent at BEP (Best Efficiency Point).

Published
2018

5. The optimum position of impeller splitter blades of a centrifugal pump equipped with vaned diffuser

Author

Khoeini Davood and Reza Tavakoli Mohammad

Subjects
Materials science, 020209 energy, Mechanical Engineering, 02 engineering and technology, Mechanics, Centrifugal pump, Volumetric flow rate, Diffuser (thermodynamics), Impeller, Mechanics of Materials, Position (vector), Splitter, 0202 electrical engineering, electronic engineering, information engineering, Head (vessel), Overall efficiency
Abstract

The present investigation has been concentrated on the optimum, circumferential position of the impeller splitter blades of a centrifugal pump equipped with vaned diffuser, numerically and experimentally. In fact, five different circumferential positions of the impeller splitter blades of central and shifted by +Pi/10, +2Pi/10, -2Pi/10, -Pi/10 (+ is the rotating direction and Pi is the distance between the two main blades) have been analyzed. Experimental and numerical results reveal good agreement and maximum head deviation of 4.8 percent. Data analyses indicated that overall efficiency of the pump increased by 1.7 percent at BEP, Best Efficient Point, by using the impeller with shifted splitter blades by +2Pi/10 in comparison with the impeller with central splitter blades. Moreover, it is found that the impeller with central splitter blades has the highest head values at all flow rates as it is 7.5 percent higher than shifted splitter blades by -2Pi/10.

Published
2018

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