GATE ME 2020 Set 1 — Question 64
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Turbomachinery → Hydraulic Turbines & Pumps → Pelton, Francis & Kaplan
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Question
For a Kaplan (axial flow) turbine, the outlet blade velocity diagram at a section is shown in figure.
The diameter at this section is . The hub and tip diameters of the blade are and , respectively. The water volume flow rate is . The rotational speed of the turbine is . The blade outlet angle is __________ degrees (round off to one decimal place).
Correct answer
11 to 14
Solution
Given:
Hub diameter,
Tip diameter,
Section diameter,
Volume flow rate,
Rotational speed,
Hub diameter,
Tip diameter,
Section diameter,
Volume flow rate,
Rotational speed,
1.Calculate the flow velocity ():
For an axial flow turbine, the flow area is:2.Calculate the blade velocity () at the given section ():
3.From the velocity triangle at the outlet:
Rounding to one decimal place, the blade outlet angle is .Continue learning with Success Tracker
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