School Science Lab Demonstration Pelton Turbine

The experimental unit consists of the Pelton wheel, a needle nozzle used as distributor, a band brake for loading the turbine and a housing with a transparent front panel.
The transparent cover enables to observe the water flow, the Pelton wheel and the nozzle during operation.
Adjusting the nozzle needle modifies the nozzle cross-section and thus the flow rate.
Water turbines are turbo machines utilizing waterpower.
The Pelton turbine is a type of impulse turbine; such turbines convert the pressure energy of water into kinetic energy entirely in the distributor.
During the conversion, the water jet is accelerated in a nozzle and directed onto the blades of the Pelton wheel tangentially.
The water jet is redirected by approximately 180° in the blades.
The impulse of the water jet is transmitted to the Pelton wheel.
The turbine torque is determined by force measurement on a band brake and is read on spring balances.  
A manometer shows the water pressure at the turbine inlet.
For measuring the rotational speed, a non-contact speed sensor, is required.  

FEATURES:
Model of an impulse turbine
Design and function of a Pelton turbine
Determination of torque, power and efficiency
Graphical representation of characteristic curves for torque, power and efficiency
Function of a Pelton turbine
Transparent front panel for observing the operating area
Loading the turbine by use of the band brake
Adjustable nozzle needle for setting different nozzle cross-sections
Marking on brake drum for non-contact speed measurement
Instruments: spring balances for determining the torque, manometer shows pressure at turbine inlet.
The experimental unit is positioned easily and securely on the work surface.
 
SPECIFICATION:
Pelton turbine :
Output: 5W at 500min-1, approx. 30L/min, H=2m

Needle nozzle :
Jet diameter: 10mm

Pelton wheel :
14 blades
Blade width: 33,5mm
External Ø: 132mm

Measuring ranges :
Force: 2x 0…10N
Pressure: 0…1bar