Question
Download Solution PDFA penstock is 3000 m long. Pressure wave travels in it with a velocity 1500 m/s. If the turbine gates are closed uniformly and completely in 4.5 s, then it is called a
Answer (Detailed Solution Below)
Detailed Solution
Download Solution PDFConcept:
Critical Time of closure is given by:
Where 2L/C = Time taken by pressure wave to travel from the valve to the tank and from tank to valve.
L = Length of pipe, C = Velocity of pressure wave
(i) The valve closure is gradual if,
(ii) The valve closure is sudden if,
Calculation:
Given,
L = 3000 m, C = 1500 m/s, tc = 4.5 second
Critical time of closure,
⇒
∵ tc (4.5 sec) > 4 sec, So it is the condition of gradual closure (slow closure).
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