MR-HM 150.19 Operating principle of a Pelton turbine Vocational Training Equipment Fluid Mechanics Experiment Equipment Description • model of an impulse turbine • transparent operating area • adjustable nozzle cross-section • loading by band brake Water turbines are turbomachines utilising water power. The Pelton turbine isa type of impulse turbine; such turbinesconvert the pressure energy of water into kinetic energy entirely in the distributor. During the conversion, the water jetis accelerated in a nozzle and directedonto the blades of the Pelton wheel tangentially. The water jet is redirected byapproximately 180° in the blades. Theimpulse of the water jet is transmittedto the Pelton wheel. MR-HM 150.19 is a model of a Pelton turbine demonstrating the function of animpulse turbine. The experimental unit consists of thePelton wheel, a needle nozzle used asdistributor, a band brake for loading theturbine and a housing with a transparent front panel. The transparent coverenables to observe the water flow, thePelton wheel and the nozzle during operation. The nozzle cross-section and thusthe flow rate are modified by adjustingthe nozzle needle. The turbine torque is determined byforce measurement on a band brakeand is read on spring balances. Formeasuring the rotational speed, a noncontact speed sensor, e.g. MR-HM 082, isrequired. A manometer shows the water pressure at the turbine inlet. The experimental unit is positioned easily and securely on the work surface ofthe MR-HM 150 base module. The water issupplied and the flow rate measured byMR-HM 150. Alternatively, the experimentalunit can be operated by the laboratorysupply. Learning objectives/experiments • design and function of a Pelton turbine • determination of torque, power and efficiency • graphical representation of characteristic curves for torque, power and efficiency Specification [1] function of a Pelton turbine [2] transparent front panel for observing the operatingarea [3] loading the turbine by use of the band brake [4] adjustable nozzle needle for setting different nozzlecross-sections [5] marking on brake drum for non-contact speedmeasurement [6] instruments: spring balances for determining thetorque, manometer shows pressure at turbine inlet [7] flow rate determination by base module MR-HM 150 [8] water supply using base module MR-HM 150 or vialaboratory supply Technical data Pelton turbine • output: 5W at 500min-1, approx. 30L/min, H=2m • Pelton wheel · 14 blades · blade width: 33,5mm · external Ø: 132mm Needle nozzle • jet diameter: 10mm Measuring ranges • force: 2x 0…10N • pressure: 0…1bar LxWxH: 400x400x620mm Weight: approx. 15kg Required for operation MR-HM 150 (closed water circuit) or water connection,drain Scope of delivery 1 experimental unit 1 set of instructional material
