Investigation of geometric effective parameters in design of 1.5kW hydraulic dynamometer

Using a dynamometer is a test procedure for electric motors, combustion engines and gas turbines in desired and controlled conditions. In gas turbine, performance assessment and efficiency assurance is to be done by a dynamometer. In this paper, the flow around a rotating disk which is located at a given distance of the stator is simulated using computational fluid dynamicsmethods and comparison between the obtained results and the available experimental data shows good agreement.Distribution of pressure, temperature, flow rate between the rotating disk and the stator, torque and dimensionless torque coefficient for the rotational speed of the rotating disk, the gap between the rotating disk and the stator, shrouded and unshrouded, inlet nozzle diameter and the net radial inlet nozzle will be reviewed. The results show that dimensionless torque coefficientincreased by reducing the clearance between the disk and the stator or increasing shroud on the stator output but it didnt make a significant change byincreasing distance between the disk and the stator. The heat transfer rate and torque are also increase by diskrotational speed increment.