Steam turbine blades: definition check for blade velocity coefficient Statement to judge: “The blade velocity coefficient equals the ratio of the relative velocity of steam at the outlet tip of the blade to the relative velocity at the inlet tip of the blade.” Choose whether the statement is correct or incorrect.

Difficulty: Easy

Correct Answer: Agree (the definition is correct)

Explanation:

Concept/Approach

The blade velocity coefficient (sometimes denoted by k_b) models frictional loss within the moving blade passage: k_b = (relative exit speed)/(relative inlet speed) = V_r2/V_r1 ≤ 1.
This definition is general and used in stage loss models.

Final Answer
Agree — it is the ratio V_r2/V_r1.

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