Flow simulation on a vortex turbine using CFD with various outlet diameter sizes

This study focusses on analyzing the effect of outlet diameter and water levels on vortex turbine performance and velocity distribution that occurs in the vortex flow. The basin will be designed with a cylindrical type with 0.5 mdiameter of basin and 5 variations of orifice. The size of the orifice is 3 cm, 5.5 cm, 8.5 cm, 10.5 cm, 16 cm. Analysis is launched by computational methods using CFD and theoretical calculations. Geometric modeling is designed using Solidworks software which is then imported on CFD. The parameters to be measured are flow velocity and water power generated at each variation of the outlet hole. Based on this study the speed of water flow increases along with the addition of the diameter of the outlet hole. The minimum speed of water flow occurs at an outlet diameter of 3 cm of 0.0889156 m/s and the maximum water flow speed occurs at an outlet diameter of 16 cm of 1.35226 m/s. The computational results verify that the water output power increases rapidly with theaddition of exhaust hole diameter for all similar flow conditions. Minimum water power is generated with an outlet hole diameter of 3 cm of 0.183447 W and maximum water power is generated with an outlet diameter of 16 cm of 53.836299 W. the ratio of output power values in the simulation and theoretical is quite close to the flow simulation with an outlet diameter of 1rd to 3rd, at the sizeof outlet holes 4rd and 5rd there is a significant difference between the simulation and theoretical calculations. The expected data of this analysis to be a reference for research and application of vortex turbine type generation.