Experimental Investigations on the Physical Model of the Pelton Turbine

U radu je opisan princip rada fizikalnog modela GUNT HM 289, eksperimentalnog uređaja Peltonove turbine izrađenog u Laboratoriju za hidrotehniku Građevinskog fakulteta Sveučilišta u Rijeci. U sklopu rada na fizikalnome modelu provedena su četiri osnovna eksperimentalna mjerenja: a) određivanje ovisnosti promjene dolazne brzine na lopatice okretnog kola i okretnog momenta o varijabilnosti hidrodinamičkog tlaka, b) određivanje ovisnosti promjena radnog tlaka o varijaciji dolaznog protoka reguliranom s pomoću igličastog ventila, c) definiranje krivulja okretnog momenta, d) određivanje mehaničke i hidrauličke snage i učinkovitosti rada Peltonove turbine ovisne o varijabilnostima radnog tlaka i rotacijske brzine.The paper describes the working principle of the physical model GUNT HM 289, which represents the Pelton turbine experimental device done in the Laboratory for Hydraulic Engineering at the Faculty of Civil Engineering, University of Rijeka. As part of the work on the physical model, four basic measurements were conducted: a) obtaining the changes of the incoming speed on the blades of a rotating wheel and torque depending on the variability of hydrodynamic pressure, b) determining the changes of the operating pressure depending on the variation of the incoming volume flow controlled by a needle valve, c) defining torque curves and d) determining the mechanical and hydraulic power and efficiency of the Pelton turbine depending on the variabilities of operating pressure and rotational speed