Perpustakaan Digital ITB

Reliable electricity supply is essential during emergency situations, particularly in frontier, outermost, and least developed regions of Indonesia where power infrastructure may be vulnerable to natural disasters and difficult access. This study proposes an emergency power supply system based on an airborne wind turbine (AWT) to provide portable renewable electricity in such areas. The proposed system consists of a horizontal-axis wind turbine supported by a cylindrical tube kite and additional lifting wings. The system is designed based on defined design requirements and objectives, followed by aerodynamic evaluation using computational fluid dynamics (CFD) in ANSYS Fluent. The aerodynamic performance of the cylinder kite is investigated at tilt angles ranging from ?20° to +20° using the k?? SST turbulence model. The lift and drag coefficients obtained from the simulations are used to evaluate the aerodynamic performance and determine the suitable operating configuration. The +20° tilt angle produces the highest lift coefficient of 0.873 and a drag coefficient of 0.382, resulting in a lift-to-drag ratio of 2.29. The cylinder kite generates a lift force of 357.58 N, which is insufficient to support the estimated system weight of 675.55 N. Therefore, additional wings are designed using the NACA 4415 airfoil, with a total design area of 25 m² after applying a safety factor of 1.2. A final CFD simulation of the cylinder kite with the attached wings produces a lift coefficient of 1.222 and a drag coefficient of 0.302, corresponding to a lift-to-drag ratio of 4.05. Based on the stated reference area and simulation conditions, the final configuration generates 872.95 N, which is sufficient lift to exceed the required lift force of the system. The results indicate that the proposed cylinder-kite-and-wing configuration has the aerodynamic capability to support the airborne system under the investigated operating conditions.