%I Institute of Physics Publishing
%A B.A. Bhayo
%A H.H. Al-Kayiem
%A N.Z. Yahaya
%V 100
%T Performance investigation of the S-rotors
%N 1
%R 10.1088/1757-899X/100/1/012043
%D 2015
%J IOP Conference Series: Materials Science and Engineering
%L scholars5533
%O cited By 4; Conference of 3rd International Conference of Mechanical Engineering Research, ICMER 2015 ; Conference Date: 18 August 2015 Through 19 August 2015; Conference Code:119245
%X This paper presents and discusses results from an experimental investigation of three models of wind S-rotors. Models 1 is modified from conventional Savonius rotor with a single stage and zero offsets zero overlaps; model 2 is three blade single stage wind rotor; and model 3 is double stage conventional Savonius rotor. The three models were designed, fabricated and characterized in terms of their coefficient of performance and dynamic torque coefficient. A special open wind simulator was designed for the test. The optimum parameters for the models were based on previous studies. The results showed that the model 1, model 2 and model 3 has the maximum power coefficient of 0.26, 0.17, and 0.21 at the correspondence tip speed ratio (TSR) of 0.42, 0.39 and 0.46, respectively. Model 1 is further optimized in terms of the aspect ratio resulting in improved power coefficient by 24. The maximum dynamic torque coefficient of model 1, model 2 and model 3 was found as 0.81, 0.56 and 0.67 at the correspondence minimum TSR of 0.28, 0.21 and 0.17, respectively. It was noted that the all three models have high torque coefficient because the models were tested at higher applied torque on the rotors.
%K Dynamics; Engineering research; Torque, Coefficient of Performance; Dynamic torques; Experimental investigations; Maximum power; Optimum parameters; Power coefficients; Savonius rotor; Tip speed ratio, Aspect ratio