Determining the mechanical power of turbine

Determining the mechanical power of turbine
o Objective :
To determine the mechanical power produced by turbine
o Theory background :
 Hydraulic machines :
Hydraulic machines are machinery and tools that use liquid fluid power to do
simple work.
 Types of hydraulic machines :
 Impulse turbines (e.g. Pelton wheel)
 Reaction turbines (e.g. Francis turbine)
 Tachometer :
This instrument is used to find RPM . Usually 3 values of RPM are taken
and then their average is used.
o Procedure :
1. Different forces (with masses) are applied on pelton wheel.
2. Accordingly pressure of striking water is also increased.
3. RPM is noted with tachometer.
4. Using RPM , Forces we calculate power of pelton wheel turbine against different
weights (Forces)

o Calculations :
Mechanical Power =?
Pb =
2πN
60
x T = w x T
Where: T = Fnet x r
r = radius of output shaft = 25mm = 0.025m
Sr. No. N
( rpm )
w =
𝟐𝛑𝐍
𝟔𝟎
( rad / s )
F1 F2 Fnet = F1 –
F2
P = w x ( Fnetx r
)
( Joule )
1 778 81.431 250 100 1.47 2.9926
2 1067.33 111.714 450 200 2.45 6.8425
3 1193 124.867 550 250 2.94 9.1777
4 1304.33 136.52 750 300 4.41 15.051
5 1532.33 160.384 850 350 4.9 19.64704

Determining the mechanical power of turbine

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Determining the mechanical power of turbine