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Head coefficient

The head coefficient (ψ) is a characteristic coefficient derived from the corresponding physical quantity according to the affinity laws and used to characterise the operating behaviour. It characterises the head (H) of the pump:

Druckzahl_Formel_1

When the head varies at constant rotational pump speed, ψ ~ H. The head coefficient (ψ) is therefore indicative of the ordinate (analogous to H) on H/Q curves plotted in a non-dimensional representation. In conjunction with the specific energy (Y), this results in:

Druckzahl_Formel_2

Head coefficient