Electronic Theses and Dissertation

Pemanfaatan energi angin di Indonesia masih perlu dikembangkan, terutama pada
wilayah dengan karakteristik kecepatan angin rendah hingga menengah. Turbin
angin sumbu vertikal tipe Darrieus H-Rotor menjadi salah satu alternatif yang
potensial karena mampu menerima angin dari berbagai arah dan memiliki
konstruksi yang relatif sederhana. Namun, performa turbin Darrieus sangat
dipengaruhi oleh parameter desain, terutama profil airfoil dan nilai solidity.
Penelitian ini bertujuan untuk menganalisis pengaruh variasi profil airfoil dan nilai
solidity terhadap performa turbin angin Darrieus H-Rotor menggunakan metode
Computational Fluid Dynamics (CFD). Model turbin yang digunakan mengacu
pada geometri referensi Castelli et al. dengan simulasi unsteady. Tahapan penelitian
meliputi pemodelan geometri, penentuan domain komputasi, boundary condition,
mesh generation, mesh independency test, domain independency test, pemilihan
model turbulensi, serta validasi model numerik terhadap data eksperimen. Setelah
model numerik dinyatakan valid, dilakukan studi parametrik terhadap variasi airfoil
dan solidity untuk memperoleh konfigurasi dengan performa terbaik. Parameter
performa yang dianalisis adalah koefisien daya (Cp) dan torsi. Konfigurasi
optimum selanjutnya dievaluasi pada variasi kecepatan angin 4 m/s, 5 m/s, dan 6
m/s yang merepresentasikan kondisi angin di wilayah Pulo Aceh. Hasil penelitian
ini diharapkan dapat memberikan pemahaman mengenai pengaruh airfoil dan
solidity terhadap performa turbin Darrieus H-Rotor serta menjadi referensi dalam
pengembangan desain turbin angin sumbu vertikal untuk wilayah dengan
karakteristik kecepatan angin rendah hingga menengah.

Wind energy utilization in Indonesia requires further development, particularly in regions characterized by low to moderate wind speeds. The Darrieus H-Rotor vertical-axis wind turbine presents a promising alternative due to its ability to capture wind from various directions and its relatively simple construction. However, the performance of Darrieus turbines is significantly influenced by design parameters, specifically the airfoil profile and solidity value. This study aims to analyze the effects of varying airfoil profiles and solidity values ​​on the performance of a Darrieus H-Rotor wind turbine using Computational Fluid Dynamics (CFD). The turbine model is based on the reference geometry of Castelli et al., utilizing unsteady simulations. The research stages include geometric modeling, definition of the computational domain and boundary conditions, mesh generation, mesh and domain independence tests, turbulence model selection, and validation of the numerical model against experimental data. Once the numerical model is validated, a parametric study involving variations in airfoil and solidity is conducted to identify the configuration yielding the best performance. The performance parameters analyzed are the power coefficient (Cp) and torque. The optimal configuration is subsequently evaluated at wind speeds of 4 m/s, 5 m/s, and 6 m/s, representing wind conditions in the Pulo Aceh region. The findings of this study are expected to provide insight into the influence of airfoil and solidity on Darrieus H-Rotor turbine performance and serve as a reference for the design development of vertical-axis wind turbines for regions with low to moderate wind speeds.