STUDI EKSPERIMENTAL TURBIN ANGIN SAVONIUS BERBILAH MODIFIED BACH DENGAN PENAMBAHAN KATUP DAN TINGKAT

• Main Author: Tito Fauzanullah, Gilang
• Format: Final Project
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/68901
• Institution: Institut Teknologi Bandung

The Savonius wind turbine is still beneficial for small-scale applications due to its self-starting ability, omnidirectionality and simple design, despite its low efficiency. However, its efficiency can be improved by modifying the blade profile and augmenting the rotor itself. The Modified Bach profile has shown potential with a coefficient of performance (Cp *) of 0.30. Earlier studies have shown that valve-augmentation improves the Cp * and multi-staging improves the static performance of Savonius rotors, whilst maintaining the simple design. Thus, this study was aimed at investigating the effects of valve-augmentation and multi-staging on Savonius wind turbines with a Modified Bach profile. Experiments were carried out at wind speeds of 6.2 m/s and 7 m/s starting with the replication at an aspect ratio of 1.1, to testing single and multi-staged rotors at an aspect ratio of 2. The data collected were then processed to produce the plots for coefficient of power, dynamic torque (Ct *), and static torque (Cts *), to evaluate their performance. From the experiments, the location of the check valve was found to be optimal at the rotor tip, yielding the highest Cp * for a valve-augmented single-staged rotor at 0.238 and 0.255 at 6.2 m/s and 7 m/s respectively, which were an increase of 4.39% and 4.51% respectively from the non-valved rotor. A reduction in the Cp * was observed for the multistaged rotors, with the trade-off of a stable Cts * at all rotational angles. The 3-staged rotor proved to be the most stable, fluctuating only between Cts * values of 0.20-0.30. Combining the two augmentation methods only saw the same modest increase in the Cp *, whilst for the Cts *, only the 2-staged valve-augmented rotor showed a sufficient increase.