Experimental investigations on single stage modified Savonius rotor

Computational assessment of the influence of the overlap ratio on the power characteristics of a Classical Savonius wind turbine

“…In order to verify the results of conducted simulations, obtained data were confronted with the experiment re- sults from Kamoji et al [5]. Relation between coe cient of power C P (ratio of the rotor and wind power) and tip speed ratio TSR for the Classical Savonius wind turbine with the overlap ratio equal to 0.15 (which was reported to exhibit the highest C P [5]), investigated by Kamoji et al is presented in Figure 4, together with 2D and 3D simulation results.…”

“…In order to investigate the in uence of the overlap ratio on the power characteristics of a Classical Savonius wind turbine, full scale threedimensional (3D) simulations were carried out together with a series of two-dimensional (2D) simulations. Dimensions of a numerical model directly correspond to a low aspect ratio turbine examined experimentally by Kamoji et al [5,6]. In this way, it was possible to verify obtained results and check the in uence of di erent task con gurations (2D or 3D solutions) on the prediction quality.…”

“…For the purposes of these investigations the model was composed of two domains ( Figure 3). The rst one (rotating) comprised the wind turbine blades and endplates and the second (stationary), simulated the wind tunnel with dimensions in accordance with the experimental test stand data [5,6]. The rotating domain radius was twice as big as the rotor radius.…”

“…A signi cant amount of performance data has been gathered [3,5] by various researchers for a wide range of rotor geometries, but there is still no generally accepted value of overlap ratio to be used in designing an "optimum" rotor geometry. Part of the problem stems from the lack of standardisation of measurement and testing techniques utilised by di erent investigators.…”

Design and Analysis of Vertical Axis Wind Turbine for Household Application

“…Kamoji et al observed the effect of the overlap ratio, blade arc angle, and aspect ratio and Reynolds number on the performance of Savonius rotor. They found that, the modified Savonius rotor without overlap ratio, with blade arc angle of 124° and with an aspect ratio of 0.7 has a maximum power coefficient 0.21 at low wind speed [5]. U. K. Saha conducted test on single, two and three stage Savonius rotor with identical stage aspect ratio and concluded that two stage Savonius rotor perform better than the single stage and three stage Savonius rotor [6].…”