Article Per Year (5 Year)
p-Index From 2020 - 2025
0.444
P-Index
This Author published in this journals
All Journal Eksergi: Jurnal Teknik Energi
Pratiwi, Okta Ayu
Unknown Affiliation
Chemical Engineering, Chemistry & Bioengineering Electrical & Electronics Engineering Energy Engineering Mechanical Engineering

Published : 2 Documents Claim Missing Document
Claim Missing Document
Check
Articles

Found 2 Documents
Search

 1 
Experimental Study Of The Performance Of A 5-Bladed Horizontal Axis Wind Turbine Of NACA 4415 Profile Using Winglets With Winglet Height Variation Mustofa, Rida; Sahid, Sahid; Adiprimaswara, Michael Putra Narendra; Aukad, Muhamad; Pratiwi, Okta Ayu; Sulistyoningtyas, Dian Lestari
Eksergi Vol. 20 No. 02 (2024): MAY 2024
Publisher : Politeknik Negeri Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32497/eksergi.v20i02.5803

Abstract

Horizontal axis wind turbine is one type ofturbine used to convert wind energy into mechanical energy. Thepurpose of this research is to design, manufacture, test andanalyze the performance of horizontal shaft wind turbine NACA4415 airfoil blades that do not use winglets with those that usewinglet height variations. The stages of this research includepreparation of literature search, planning and making NACA4415 airfoil blades both using winglets and not using winglets,assembling test equipment and assembling wind turbineinstallations, testing and taking wind turbine performance data,data processing and analysis, final results. The turbine diameterused is 1.1m with a blade thickness of 18 mm and a chord lengthof 38mm. Tests were carried out with winglet height testvariables of 5%, 7%, 9%, and 11% of the rotor length at windspeeds of 4 m/s, 6 m/s, 8 m/s and 10 m/s. The test results showthat the NACA 4415 airfoil horizontal shaft wind turbine usinga winglet with a height of 7% has optimum performance at 4 m/sand 6 m/s with efficiencies of 23.68% and 8.75%, respectively,while when the wind speed is 8 m/s and 10 m/s the optimumturbine performance is achieved when using a 9% winglet withefficiencies of 6.12% and 3.64%, respectively. The mostoptimum turbine performance improvement is achieved whenusing a 7% winglet with an efficiency increase of 204.76% at awind speed test of 4 m/s. Keywords”” HAWT,
Horizontal Axis Wind Turbine Efficiency Optimization Through Tip Radius Modification on 4:5 Flat Taper Blades Sahid, Sahid; Anandia, Faranita Putri; Wattimena, Christopher Johanes Edsel; Pratiwi, Okta Ayu; Tantri, Riris Annisa Tarra; Barid, Muhammad
Eksergi Vol. 21 No. 03 (2025): SEPTEMBER 2025
Publisher : Politeknik Negeri Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32497/eksergi.v21i03.7112

Abstract

This study aims to investigate how changing the roundness of the back edge of blades affects a 4:5 flat taper wind turbine. Tests used blades with 5 mm, 10 mm, and 15 mm rounded edges, compared to a 5 mm notched blade, across wind speeds from 3 to 9 m/s. The results show the 5 mm rounded edge works best at low wind speeds, with an efficiency of 11.12% at 3 m/s. At higher wind velocities, the 15 mm rounded blade demonstrated superior aerodynamic performance, attaining an efficiency of 1.63% at 7 m/s. The rounded trailing edge improved aerodynamic behavior by minimizing turbulence and enhancing flow stability. Therefore, the optimal edge radius should be determined based on regional wind characteristics, especially for low-speed wind zones typical of Indonesia
Co-Authors Adiprimaswara, Michael Putra Narendra Anandia, Faranita Putri Aukad, Muhamad Barid, Muhammad Mustofa, Rida Sahid Sahid Sulistyoningtyas, Dian Lestari Tantri, Riris Annisa Tarra Wattimena, Christopher Johanes Edsel