扬程(又称为水头(hydraulic head)或落差),是单位重量液体通过所获得的能量。泵的扬程包括吸程在内,近似为泵出口和入口压力差。

扬程用H表示,单位为米(m)。泵的压力用P表示,单位为MPa(兆帕)

H=P/(ρg)

如P为1 kg/cm2,ρ(水)为1000 kg/m3

则H=(1 kg/cm2)/(1000 kg/m3)

H=(1 kg/cm2)/(1000 kg/m3)=(10000 kg/m2)/(1000 kg/m3)=10 m

1 MPa=10 kg/cm2

得H=(P2-P1)/(ρg) =ΔP/(ρg)

(P2=出口压力P1=进口压力ΔP=压力差)

参见

Template:Aquiferproperties

注释

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