GATE ME 2018 Set 2 — Question 21
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Turbomachinery → Steam & Gas Turbines → Degree of Reaction & Compounding
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Question
Select the correct statement for 50% reaction stage in a steam turbine.
Correct answer
(D) The absolute exit flow angle is equal to inlet angle of rotor blade.
Solution
In a 50% reaction turbine (Parson's turbine), the enthalpy drop is equally divided between the stator (fixed blades) and the rotor (moving blades). This results in symmetric velocity triangles, meaning the fixed and moving blades have identical profiles.
Let and be the absolute inlet and exit flow angles, and and be the relative inlet and exit flow angles (blade angles). For a 50% reaction stage:
Let and be the absolute inlet and exit flow angles, and and be the relative inlet and exit flow angles (blade angles). For a 50% reaction stage:
1.
2.
Option (D) states that the absolute exit flow angle () is equal to the inlet angle of the rotor blade (), which is a fundamental property of a 50% reaction stage.Continue learning with Success Tracker
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