Corrected speed

Corrected Speed is the speed a component would rotate at if the inlet temperature corresponded to ambient conditions at Sea Level, on a Standard Day (i.e. 288.15K).

Corrected Speed, $N/{\sqrt {\theta }}$ , can be calculated as follows:

$N/{\sqrt {\theta }}=N/{\sqrt {T/288.15}}$

Corrected Speed is often abbreviated to $Nc$ or $Nr$ (for Referred Speed).

So-called Non-Dimensional Speed $(N/{\sqrt {T}})$ is proportional to Corrected Speed:

$N/{\sqrt {T}}=(N/{\sqrt {\theta }})/{\sqrt {288.15}}$

Nomenclature:

$T$ Stagnation (or Total) Temperature (in Kelvin)
$N$ Real Shaft Speed
${\theta }$ Referred Temperature

In relative form, Corrected Speed, Referred Speed and Non-Dimensional Speed are all measures of peripheral Mach number.

Corrected speed

See also