Mechanical Engineering - Hydraulic Machines - Discussion
Discussion Forum : Hydraulic Machines - Section 4 (Q.No. 10)
10.
A jet of water is striking at the centre of a curved vane moving with a uniform velocity in the direction of jet. For the maximum efficiency, the vane velocity is __________ of the jet velocity
Discussion:
18 comments Page 1 of 2.
Rajiv said:
2 years ago
@Akhila.
I think the given question is single vane concept. So, pelton wheel concept is not applicable.
I think the given question is single vane concept. So, pelton wheel concept is not applicable.
Akhila said:
2 years ago
I agree with option A, as pelton wheel has curved moving vanes having max efficiency at 1/2.
Vinay BEL said:
4 years ago
One-half is right.
Sdd said:
4 years ago
Is Pelton turbine blade is curved or flat?
Kartik Oraon said:
5 years ago
@Ali.
What is the formula of efficiency in this case?
What is the formula of efficiency in this case?
Kartik Oraon said:
5 years ago
What is the formula of efficiency, in this case? Is it 2u (1+cos(θ) )/(v-u)?
Ali said:
5 years ago
For plane plate its 1/2 and for curved plate its 1/3.
(2)
Teja said:
6 years ago
Either flat plate or curved vane, the answer is same for the both and it is option A.
(1)
Naga said:
6 years ago
The hydraulic efficiency of an impulse turbine is maximum when the velocity of the wheel is one-half the velocity of a jet of water at the inlet.
Deepak rathva said:
7 years ago
1/3 is correct.
dn/du = 0 for max. n (efficiency).
Solving this we get u = V/3.
dn/du = 0 for max. n (efficiency).
Solving this we get u = V/3.
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