Project ForgeFluid Mechanics
Bernoulli's Equation & Flow
GATE 2018
Medium
Select the correct statement for 50% reaction stage in a steam turbine.
- AThe rotor blade is symmetric.
- BThe stator blade is symmetric.
- CThe absolute inlet flow angle is equal to absolute exit flow angle.
- The absolute exit flow angle is equal to inlet angle of rotor blade.
Explanation
A 50% reaction (Parsons) stage has symmetric velocity triangles: the absolute flow angle entering the rotor (leaving the stator, α1) equals the rotor blade's exit angle (β2), and the absolute exit flow angle from the rotor (α2) equals the rotor blade's inlet angle (β1) — i.e. the absolute exit flow angle equals the inlet angle of the rotor blade.
Source: GATE ME 2018 Session 2 (Set 2) (2018)
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