Computation and Experimental Analysis of Helical Bach-Type Savonius Wind Turbine for Water Pumping Application

Abstract

Access to clean, accessible, affordable and renewable energy resources and their sustainable application has
been a major concern in the 21st century due to environmental and socio-economic consequences from the
conventional use of fossil fuels. Wind energy has been seen as one of the potential options for meeting the
need of energy target set under the UN SDG goals and promoting energy and water security. This study deals
with a comprehensive study on the performance evaluation and analysis of a helical Bach-type Savonius wind
turbine design for the water pumping applications. The results obtained from the computational and experimental
analyses were examined for determining the performance parameters such as power coefficient (Cp), torque
coefficient (Ct), and tip speed ratio (TSR) at different wind speeds. The findings demonstrated that a TSR has
direct relationship power coefficient and inverse relationship torque coefficient. With the helical Bach-type turbine
of 0.7m rotor height and surface area of 0.7 m2 two bladed helical rotor was found to generate 2.306 W of energy
with the Cp of 0.114. The cutoff speed of the turbine was found to be 1m/s. These results signify that the rotor
can operate even at a very low wind speed opening the avenues for tapping its potential of applications for
pumping water in the sustainable manner thus helping to address the water, energy and food security in the
modern energy deprived countries.