# Effect of increasing flow coefficient on blade loading coefficient in axial flow compressor

Q.  What is the effect of increasing flow coefficient (Φ) in an axial flow compressor on blade loading coefficient (Ψ)?
- Published on 16 Sep 15

a. Blade loading coefficient (Ψ) increases
b. Blade loading coefficient (Ψ) decreases
c. Blade loading coefficient (Ψ) remains constant
d. Unpredictable

ANSWER: Blade loading coefficient (Ψ) decreases

#### Discussion

• Pankaj   -Posted on 16 Oct 15
- Flow coefficient, Φ for an axial flow compressor can be defined as the ratio of axial velocity of flow (Cf) to the peripheral velocity of the blades (Cb).

∴ Φ = (Axial velocity of flow Cf) / (Peripheral velocity of the blades Cb)

- Blade loading coefficient, Ψ is given by the formula,

Ψ = Workdone / (Blade Velocity)2

Ψ = W / (Cb)2

- Blade loading coefficient for an axial flow compressor decreases with increase in the flow coefficient for the same compressor as show in diagram.

The performance of 50% reaction axial flow compressor can be predicted by using blade loading coefficient and flow coefficient.

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