Centrifugal pump hydraulic loss what

Centrifugal pump hydraulic loss impact loss, eddy loss and along the friction loss.

First, the impact of loss

Each pump has its own design flow, when consumed in the design flow conditions, the flow of the inlet is along the leaves into the impeller, so the impact does not occur with the leaves, the same outlet flow does not occur and The impact of the pump shell, then more efficient. However, when the flow deviates from the design condition, the flow direction of the flow should deviate from the direction of the blade to generate an impact.

Second, the loss of vortex

In a water pump, the overcurrent section is a very complex space cross section. When the liquid passes through it, the flow rate is too small and the direction must be constantly changing, which inevitably results in vortex loss. In addition there are sharp corners of the flow surface, burrs, stagnant water will increase the vortex loss.

Third, friction along the way loss

Due to the rough surface of the pump overcurrent and the liquid has a viscosity, so the fluid will have a friction resistance loss when swimming. The size of the loss is expressed by:

Hm = AQ2 where A - coefficient.

Painted on the coordinates, that is, a parabola to the origin of the vertex.

In all parts of the hydraulic losses, the hydraulic impeller within the largest loss, accounting for all the confusion about half the loss of black and white; followed by the guide vane hydraulic losses, accounting for about 1/4 of the total hydraulic losses, while the remaining 1 / 4 hydraulic loss, loss in the impeller to the guide vane, diffusion guide vanes, anti-guide vane to the impeller entrance and several other parts.

In order to reduce the hydraulic loss of the pump, the flow should be smooth changes in all sections, the size of a reasonable speed. And select the appropriate impeller, guide vane-type and entrance placement angle. In addition, the surface finish of the overcurrent component should also be increased.