CHARACTERISTICS CURVES OF FRANCIS TURBINE

**AIM:**

To conduct load test on franchis turbine and to study the characteristics of francis turbine.

**APPARATUS REQUIRED:**

1. Stop watch

2. Tachometer

**FORMULAE:**

**1. VENTURIMETER READING:**

h = (p1 - p2) x 10 (m)

Where

P1, p2- venturimeter readings in kg / cm

^{2}**2. DISCHARGE:**

Q = 0.011 x Ö h (m

^{3}/ s)**3. BRAKE HORSEPOWER:**

BHP = p x D x N x T / 60 x 75 (h p)

^{}## Where

N = Speed of turbine in (rpm)

D = Effective diameter of brake drum = 0.315m

T = torsion in [kg]

**4. INDICATED HORSEPOWER:**

HP = 1000 x Q x H / 75 (hp)

Where

H – total head in (m)

**5. PERCENTAGE EFFICIENCY:**

%h = B.H.P x 100 / I.H.P ( %)

**DESCRIPTION:**

Modern Francis turbine in an inward mixed flow reaction turbine it is a medium head turbine. Hence it required medium quantity of water. The water under pressure from the penstock enters the squirrel casing. The casing completely surrounds the series of fixed vanes. The guides’ vanes direct the water on to the runner. The water enters the runner of the turbine in the dial direction at outlet and leaves in the axial direction at the inlet of the runner. Thus it is a mixed flow turbine.

**PROCEDURE:**

1.The Francis turbine is started

2. All the weights in the hanger are removed

3.The pressure gauge reading is noted down and this is to be

maintained constant for different loads

4. Pressure gauge reading is assended down

5. The venturimeter reading and speed of turbine are noted down

6.The experiment is repeated for different loads and the reading are tabulated.

**GRAPHS :**

The following graphs are drawn

1. BHP (vs.) IHP

2. BHP (vs.) speed

3. BHP (vs.) % efficiency

**RESULT :**

Thus the performance charactertics of the Francis wheel turbine are done and the maximum efficiency of the turbine is …………. %

h % | | | | | | | |

I.H.P hp | | | | | | Mean | |

B.H.P hp | | | | | | ||

DischargeQ x10^{-3}m^{3}\sec | | | | | | ||

Tension[T]Kg | | | | | | ||

SpringBalanceT2Kg | | | | | | ||

Weigh of hanger[T1]kg | | | | | | ||

Speed of turbineNRpm | | | | | | ||

Weight of hanger ToKg | | | | | | ||

H= (P1-P2) x 10m of water | | | | | | ||

Venturimeter readingKg\cm^{2} | P2 | | | | | | |

P1 | | | | | | ||

Total Head[H]m of water | | | | | | ||

PressureGaugeReading[Hp]Kg\cm^{2} | H2 | | | | | | |

H1 | | | | | | ||

S.no | | | | | |

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