Effect of blade's configuration on the performance of centrifugal pumps
Ashraf Sadek Abo El-yazed;
Abstract
Centrifugal pumps are considered as the main active part in the hydraulic systems used for liquid transportation. In the present work, the effect of changing the blade configurations of the centrifugal pump impeller on the centrifugal pump performance has been investigated.
A test rig was set up to measure the pump head, discharge, and power. The impeller of the pump under investigation was designed such that, its shape could be changed. Each of the five blades was divided into three parts. The second and the third portions of each blade could be rotated forward or backward by a step of 24 degree. The case with no rotation (continuous blade) tested as a base line reference, should be refereed to in the rest of the research as the conventional blade. Eight additional configurations resulted from rotating either or both of the movable sections, forward or backward. The change in flow rate and head associate with each case was recorded for each blade configuration and compared to the conventional case.
The performance is computed for a design speed of 1450 rpm, as well as 3 other rotational speeds, namely: 1200, 900, and 700 rpm.
Further investigation was carried using computational fluid mechanics to analyze the flow patterns through a pump with an impeller having a conventional blade configuration. The performance curve produced by the simulation satisfactory the curve obtained experimentally.
The results showed that, splitting the impeller blade's does not change the normal pump characteristics behavior of the backward-curved blade, but it affects the pump efficiency, head, flowrate, and cavitation depending on the number of splitted parts, position of splitting and the direction of rotation of the splitted parts (backward or forward).
A test rig was set up to measure the pump head, discharge, and power. The impeller of the pump under investigation was designed such that, its shape could be changed. Each of the five blades was divided into three parts. The second and the third portions of each blade could be rotated forward or backward by a step of 24 degree. The case with no rotation (continuous blade) tested as a base line reference, should be refereed to in the rest of the research as the conventional blade. Eight additional configurations resulted from rotating either or both of the movable sections, forward or backward. The change in flow rate and head associate with each case was recorded for each blade configuration and compared to the conventional case.
The performance is computed for a design speed of 1450 rpm, as well as 3 other rotational speeds, namely: 1200, 900, and 700 rpm.
Further investigation was carried using computational fluid mechanics to analyze the flow patterns through a pump with an impeller having a conventional blade configuration. The performance curve produced by the simulation satisfactory the curve obtained experimentally.
The results showed that, splitting the impeller blade's does not change the normal pump characteristics behavior of the backward-curved blade, but it affects the pump efficiency, head, flowrate, and cavitation depending on the number of splitted parts, position of splitting and the direction of rotation of the splitted parts (backward or forward).
Other data
| Title | Effect of blade's configuration on the performance of centrifugal pumps | Other Titles | تأثير شكل الارياش على آداء المضخات الطاردة المركزية | Authors | Ashraf Sadek Abo El-yazed | Issue Date | 2014 |
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