Influence of density on performance curve of CYZ self-primin

The characteristic curve provided by the manufacturer is measured with clean water as the working medium..

When the self-priming oil pump is conveying other liquids..

The influence of liquid density and viscosity should be considered.

Viscosity when the viscosity of the liquid is greater than the viscosity of the water under experimental conditions..

Increased energy loss in the pump body..

Pump flow, pressure head reduced..

A drop in efficiency...

The volume flow rate and the pressure head of the centrifugal pump are independent of the liquid density..

The power increases with the density.

Influence of centrifugal pump speed on characteristic curve

When the liquid is not very viscous...

When the pump efficiency is constant..

The flow rate, pressure head, shaft power and speed of the pump can be approximately calculated by the proportional law.

The Q2 / Q1 = n2 / n1..

H2/H1=n2/n12..

N2/N1=n2/n13..

In the formula, Q1, H1, N1 centrifugal pump flow, head and power when the speed is N1.

Flow rate, head and power of Q2, H2, N2 centrifugal pump at N2 speed.

The set of formulas above is called the proportionality law.

When the speed change is less than 20%..

It may be assumed that efficiency is constant...

The calculation error is not big.

If more points are selected on the characteristic curve with rotation speed of N1...

Use the law of proportion to calculate the corresponding data when the speed is n2.

And plot the result on the graph paper..

And you get the characteristic curve at n2.

The influence of impeller diameter on the characteristic curve When the speed of the pump is certain..

Its head, flow and impeller diameter.

Q2/Q1=D2/D1..

H2/H1=D2/D1N2/N1=D2/D13, where the speed of centrifugal pumps Q1, H1 and N1 are the flow rate, head and power at D1.

Flow, head and power of Q2, H2, N2 centrifugal pump when the speed is D2