Analysis of the aerodynamic performance of a novel type collapsible sail rotor / Alfredo B. Aranajo.

Thesis (Master of Engineering) -- Cebu Institute of Technology - University, March 2001.

The nature of this project is experimental. It dealt with the analysis of the aerodynamic performance of a novel type collapsible ? sail rotor, for possible use as a clean, alternative, cheap power source of energy. The collapsible ? sail rotor is a horizontal rotating wind machine employing the principle of drag as its propulsion. The collapsible sail is a new innovation, a new concept of design in the installation of the wind machine?s most important part- that which captures the kinetic energy of the wind, the sail.

The main objectives of this study were to evaluate the horizontal Collapsible ? Sail Rotor?s aerodynamic performance with respect to its ability to capture the wind?s kinetic energy and then to determine its suitability to function properly on the prevailing local wind conditions based on PAGASA?s 2 to 3 minutes per second wind velocity record of 27 ? year period.

The experimental method of evaluation was used. Two set ? ups were organized namely: the rotor outdoor experimentation which was done outside to evaluate the rotor at near actual conditions and the indoor test which was executed inside to assume a laboratory controlled conditions. The main instrument that measured the kinetic motion of the wind was the Digital Anemometer/Thermometer. Since, the model of the rotor was used, a fan was utilized to simulate the kinetic energy of the wing throughout the experiments at the three fan regulator speeds, i.e. low, mid & high.

The outdoor experiments at the three fan speeds resulted to 100% ratings which were neglected as evaluation results, since crosswind interference was observed and was instrumental in influencing its performance evaluation. On the other hand, the indoor test ratings of 96%, 95% and 90% were chosen for evaluation because no crosswind affected it and its velocity characteristics was more responsive to the given fan speed settings.

The experimental evaluation determined that the most credible efficiency was that of the 90% rating at high speed fan setting, because the effect of turbulence behind the motor was curtailed by a more defined streamline owing to a stronger downwind velocity. The effect of turbulence at the back of the rotor apparently produced a higher efficiency rating which, however, was not chargeable to the rotor?s performance.

It is hoped that the outcome of this study will make a modest contribution as alternative source of energy to the rural areas.