Engineering: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. 288.15 K).

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

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

Corrected speed is often abbreviated to $N_c$ or $N_r$ (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 kelvins),
• $N$ – real shaft speed,
• $\theta$ – referred temperature.

In relative form, corrected speed, referred speed and non-dimensional speed are all measures of peripheral Mach number.

See also

• Compressor map
• Turbine map
• Corrected flow