Hydraulic loss of centrifugal pump including shock loss, whirlpool loss and frictional loss.
First, the shock loss
Each pump has its own design flow, when consumed in the design flow conditions at work, the entrance is down stream into the impeller blades, and therefore does not react with the blade hit the same outlet flow nor the occurrence and the impact of the pump housing, then a high efficiency. However, when the flow rate deviates from the design condition, it is necessary to deviate from the direction of the flow direction of the blade occurs, have an impact.
Second, whirlpool loss
In the water pump, flow cross-section is very complex spatial cross-section, where the liquid through the flow rate and direction are too small to be constantly changing, so inevitably produce swirl losses. Also the presence of overcurrent sharp corners, burrs, also increases the loss of dead zones whirlpool surface.
Third, the frictional loss
Since the pump flow surface roughness and a viscous liquid, the liquid when swimming will produce friction losses. Loss size indicated by the following formula;
Hm = AQ2 formula A– coefficient.
Videos on the coordinates, that is a vertex at the origin of the parabola.
In various parts of the hydraulic losses, the loss of hydraulic impeller largest, accounting for about half of all black and white confuse losses; followed by the loss of hydraulic vane corner, accounting for about a quarter of all hydraulic losses, while the remaining 1 / 4 hydraulic losses, the loss to the impeller vanes, guide vane diffuser section, ABM leaves the impeller inlet and several other parts.
In order to reduce hydraulic loss of the pump, the flow of each section should be changed slowly, the speed of a reasonable size. And the appropriate choice of the impeller, guide vane type and placement of the entrance angle. It should also improve the flow through the surface finish of parts.
