What metric quantifies the relationship between the speed of the blade tip and the incoming wind speed?

Answer

Tip Speed Ratio (TSR)

The Tip Speed Ratio (TSR) is the ratio of the speed of the blade tip to the speed of the incoming wind, and this relationship dictates the $C_p$ at which a turbine operates.

What metric quantifies the relationship between the speed of the blade tip and the incoming wind speed?

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