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If ‘ϕ’ is the angle of blade tip at outlet, then maximum hydraulic efficiency of an impulse turbine is
- a)
- b)
- c)
- d)
Correct answer is option 'A'. Can you explain this answer?
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If ‘’ is the angle of blade tip at outlet, then maximum hy...
The velocity diagram of a Pelton wheel is given below -
V1, V2 = Velocity of the jet at inlet and outlet.
u1, u2 = Velocity of the vane at inlet and outlet.
Vr1, Vr2 = Relative velocity of jet at inlet and outlet.
Vw1, Vw2 = Whirl velocity i.e. component of velocity parallel to the direction of motion.
Vf1, Vf2 = Flow velocity i.e component of velocity perpendicular to the direction of motion.
α = ∠ between the direction of jet and direction of motion.
θ = ∠ between Vr1 and the direction of motion.
β = ∠ between V2 with the direction of motion.
ϕ = ∠ between Vr2 with the direction of motion.
Hydraulic efficiency is given by -
Given:
For Pelton wheel
V1 = Vw1, u1 = u2 = u, Vr1 = Vr2.
If Nozzle is 100 % efficient -
Hydraulic efficiency is:
For ηh to be maximum;
∴ 2u = 2V1 - 2u
⇒ 4u = 2V1
∴ V1 = 2u
Putting this in eq (1)
V1, V2 = Velocity of the jet at inlet and outlet.
u1, u2 = Velocity of the vane at inlet and outlet.
Vr1, Vr2 = Relative velocity of jet at inlet and outlet.
Vw1, Vw2 = Whirl velocity i.e. component of velocity parallel to the direction of motion.
Vf1, Vf2 = Flow velocity i.e component of velocity perpendicular to the direction of motion.
α = ∠ between the direction of jet and direction of motion.
θ = ∠ between Vr1 and the direction of motion.
β = ∠ between V2 with the direction of motion.
ϕ = ∠ between Vr2 with the direction of motion.
Hydraulic efficiency is given by -
Given:
For Pelton wheel
V1 = Vw1, u1 = u2 = u, Vr1 = Vr2.
If Nozzle is 100 % efficient -
Hydraulic efficiency is:
For ηh to be maximum;
∴ 2u = 2V1 - 2u
⇒ 4u = 2V1
∴ V1 = 2u
Putting this in eq (1)
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If ‘’ is the angle of blade tip at outlet, then maximum hydraulic efficiency of an impulse turbine isa)b)c)d)Correct answer is option 'A'. Can you explain this answer?
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If ‘’ is the angle of blade tip at outlet, then maximum hydraulic efficiency of an impulse turbine isa)b)c)d)Correct answer is option 'A'. Can you explain this answer? for Civil Engineering (CE) 2024 is part of Civil Engineering (CE) preparation. The Question and answers have been prepared according to the Civil Engineering (CE) exam syllabus. Information about If ‘’ is the angle of blade tip at outlet, then maximum hydraulic efficiency of an impulse turbine isa)b)c)d)Correct answer is option 'A'. Can you explain this answer? covers all topics & solutions for Civil Engineering (CE) 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for If ‘’ is the angle of blade tip at outlet, then maximum hydraulic efficiency of an impulse turbine isa)b)c)d)Correct answer is option 'A'. Can you explain this answer?.
If ‘’ is the angle of blade tip at outlet, then maximum hydraulic efficiency of an impulse turbine isa)b)c)d)Correct answer is option 'A'. Can you explain this answer? for Civil Engineering (CE) 2024 is part of Civil Engineering (CE) preparation. The Question and answers have been prepared according to the Civil Engineering (CE) exam syllabus. Information about If ‘’ is the angle of blade tip at outlet, then maximum hydraulic efficiency of an impulse turbine isa)b)c)d)Correct answer is option 'A'. Can you explain this answer? covers all topics & solutions for Civil Engineering (CE) 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for If ‘’ is the angle of blade tip at outlet, then maximum hydraulic efficiency of an impulse turbine isa)b)c)d)Correct answer is option 'A'. Can you explain this answer?.
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