GATE ME 2014 Set 2 — Question 57
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Turbomachinery → Steam & Gas Turbines → Steam Turbine Staging
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Question
Steam at a velocity of enters the impulse turbine stage with symmetrical blading having blade angle . The enthalpy drop in the stage is . The nozzle angle is . The maximum blade efficiency (in percent) is _______
Correct answer
85.1 to 89.9
Solution
Step-by-step solution:
Given nozzle angle .
In percentage: The maximum blade efficiency is approximately .
1.Understand the type of turbine:
The question specifies an impulse turbine stage with symmetrical blading.2.Recall the condition for maximum blade efficiency:
For a single-stage impulse turbine (De Laval turbine), the maximum blade efficiency occurs when the blade speed ratio , where is the nozzle angle.3.Calculate maximum blade efficiency:
For symmetrical blading and neglecting friction (), the maximum blade efficiency is given by:Given nozzle angle .
4.Compute the value:
In percentage: The maximum blade efficiency is approximately .
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