8Brake Power, Pb Pb =2 × π × N × T = 2 × 3.142 × 29.46 × 0.00392 Nm=7.249W  Turbine Efficiency, Et Et = × 100%= × 100%=8.218 %DiscussionThe working principle of Pelton wheel turbine is water flows along the tangent to the path of the runner. Nozzles direct forceful streams of water against a series of spoon-shaped bucketsmounted around the edge of a wheel. As water flows into the bucket, the direction of the water velocity changes to follow the contour of the bucket. When the water-jet contacts the bucket, thewater exerts pressure on the bucket and the water is decelerated as it does a "u-turn" and flowsout the other side of the bucket at low velocity. In the process, the water's momentum istransferred to the turbine. This "impulse" does work on the turbine. For maximum power and efficiency, the turbine system is designed such that the water-jet velocity is twice the velocity of the bucket. A very small percentage of the water's original kinetic energy will still remain in the water; however, this allows the bucket to be emptied at the same rate it is filled, thus allowing the water flow to continue un interrupted.From the results obtained, we can see how Pelton Wheel reacts to different kind of input.Different flow rates give different value of work input. The slower the flow rates, the larger thework being put into the wheel. The efficiency of the slower flow rates is also better than faster one. The speed of the wheel also dropped when much weight being dropped until it stoppedsuddenly when the weight is too much for it to go against.

Water turbines

Pelton turbine , a type of impulse water turbine.

Francis turbine , a type of widely used water turbine.

Kaplan turbine , a variation of the Francis Turbine.

Turgo turbine , a modified form of the Pelton wheel.

Cross-flow turbine , also known as Banki-Michell turbine, or Ossberger turbine.

  2 Procedures 1.   First of all, perform the general start-up procedures.2.  

Fully open the throttle valve and allow the water to circulate until all air bubbles havedispersed.3.

  Open and adjust the spear valve for a particular nozzle opening.4.   Tighten up the tensioning screw on the pulley wheel until the turbine is almost stalled (rotor

just turning).5.   Decide on suitable increments in force to give adequate sample points and note the valueof the

pulley brake.6.   Slacken off the tensioning screw so no force is being applied to the turbine.7.   Tighten the screw to give the first increment in force for the brake. When readings aresteady

enough, record all the readings again.8.   Repeats step 7 above for a gradually increasing set of fb values. The final sample pointwill

correspond to the turbine stalling.9.   The data may now be used for analysis and to plot the pelton turbine characteristicscurve.10.    Now decrease the volume flow rate to a new setting by changing the throttle valve position

and at the same time also change the spear valve position to maintain the pressure at 1.0 kgf/cm