Question

If \(\beta>90^\circ\), then the blade shapes are known as

• A. forward curved blades
• B. radial blades
• C. backward curved blades
• D. straight blades

Hint:

Forward curved blades produce higher pressure rise but are less efficient.

Answer 1

The Correct Option is A

Solution: In the context of turbomachinery and aerodynamic blade design, the angle \(\beta\) refers to the blade angle relative to the direction of the flow. The different classifications of blade shapes based on the angle \(\beta\) are:

• Forward Curved Blades: These have a blade angle \(\beta\) greater than \(90^\circ\). Hence, when \(\beta>90^\circ\), the blades are called forward curved blades.
• Backward Curved Blades: These have a blade angle \(\beta\) less than \(90^\circ\).
• Radial Blades: These have a blade angle \(\beta\) equal to \(90^\circ\).

Therefore, when \(\beta>90^\circ\), the blade shapes are known as forward curved blades.