Abstract
Wall roughness is an important factor in the pump head and efficiency. Influence of wall roughness on the performance of a centrifugal pump is conducted with numerical approach. In the present study, a critical value of wall roughness is found. The performance of the pump decreases significantly while the wall roughness is less than critical value and decreases slightly while exceeding it. Influence of wall roughness of each domain is compared; the result revealed that the influence of wall roughness was decreased for volute, impeller, inlet and outlet respectively. Blade wall roughness of impeller has the greatest effect on pump performance, and pressure surface roughness has a greater influence than that for suction surface. This study could provide a reference for the manufacture and design of this type of centrifugal pump.
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