Home SCIENCE How An Impulse (Pelton) Turbine Works And Tests Its Performance

How An Impulse (Pelton) Turbine Works And Tests Its Performance

The Pelton wheel is an important and efficient fluid power machine, used in many applications.The product consists of a Pelton wheel mounted in a corrosion-resistant enclosure. A transparent front panel allows students to see the turbine working. An optional Stroboscope (ST1, available separately) can ‘freeze’ the image of the turbine to help students better understand how it works.

source/image(PrtSc): TecQuipment Ltd

An adjustable spear valve directs a jet of water through a nozzle to the buckets of the Pelton wheel to make it turn. Manual adjustment of the spear valve controls the water jet from the nozzle.The turbine includes all pipes and fittings to connect it to TecQuipment’s Digital Hydraulic Bench (H1F, available separately)*, for flow measurement.

The Optical Tachometer (OT1, available separately) measures the speed of rotation of the turbine.A simple mechanical brake and spring balance assembly attached to the shaft of the Pelton wheel applies a variable mechanical load (torque).


Students use this with the speed (from the optional tachometer) to find power absorbed by the turbine. A gauge measures inlet pressure.Students adjust the spear valve and measure inlet pressure, flow rate and torque (and speed with the optional tachometer). They plot these values to find the turbine performance.//TecQuipment Ltd