THE INFLUENCE OF TURNING AND SURFACE RUDENESS ON PERFORMANCE OF MICRO HYDRO TURBINE

Abstract

The potential energy utilization of water is one of them is to use screw turbine technology as a microhydro power plant. Some parameters that affect the performance of screw turbines are the number of threads, surface roughness, shaft tilt angle and flow discharge. This study aims to determine the effect of thread count and surface roughness on the performance of screw turbines. The research was conducted with experiments, in which turbines used variations in the number of threads 7, 9, 11. Roughness uses grid variations 0 (without roughness), grid 40, grid 60. The slope angle of the shaft uses 30, 33, 36 and flow discharge using valve openings of 50 (502.14), 70 (22.42), (90) 803.52. Analysis of turbine performance is reviewed based on the rotation speed (Rpm) and voltage (volts) produced. The results showed the flow discharge, number and angle of the turbine as well as the roughness of the surface of the sudu influenced the performance of the screw turbine. The lower the number of threads and the level of roughness, the rotation and voltage will increase and vice versa. The amount of sudu and the level of roughness of the sudu surface will trigger an increase in the area of fluid flow resistance. The test results showed the best turbine performance at a variation of 7 threads, with a slope angle of 33o with grid roughness of 0 (without roughness) producing a voltage of 7.26 volts at 2928.40 rpm.