Hva er spesifikk hastighet?

Convention-dependent index characterizing impeller geometry (its numeric value depends on the units used). Same Ns=similar machines.

Hvilke enheter skal man bruke?

SI: RPM, m³/s, meter. Ulike enheter gir forskjellige Ns-verdier.

Yes. Replace head with ΔP/(ρg). Same impeller type guidance.

Toppeffektivitet: Ns=40–80 for sentrifugalpumper.

Gratis ingeniørverktøy — #161

Ns=n√Q/H^(3/4). Bestem anbefalt impellertype.

Ns=n√Q/H^(3/4)Impellertype

Spesifikk hastighet (Ns)

-

Anbefalt impeller

-

ω (rad/s)

-

Gjennomstrømning (m³/t)

-

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