OPTIMIZATION DESIGN OF NATURAL COMPOSITE PROPELLER OF WIND TURBINE FOR COASTAL AREA PANDANSIMO, YOGYAKARTA, INDONESIA

Abstract

The objective of this research is to study a feasibility of potential local genius material in Indonesia, particularly ramie fiber (Boehmerianivea) and Albizia wood (Albiziafalcata) as modified NACA 4415 based propellers.Modified NACA 4415 is fluid dynamic modeled with FLUENT software and experimental validated. The optimum design of blades is found to be 1.625 m in length with 20 elements blade with chord length from 0.08 to 0.28 m and twist angle of 24,8⁰ and -4,7⁰ at hub and tip, respectively. Propeller has a maximum Betz coefficient of 0.4 at Tip Speed Ratio of 4. At average wind speed of 3-5 m/s in Indonesia, this wind turbine can generate power output, torque, and power coefficient of 50-240 watts, 25 Nm-75 Nm, 0.35-0.40, respectively. The coefficient of aerodynamic of modified NACA 4415 has good performance at Reynolds number of 41000- 250000. Fabrication with hand lay-up method gives the highest bending stress of 30.881 MPain 2 layers composite. The modulus elasticity and and bending strain of 2 layers composite are 2.018GPaand1.795%.