Studi Numerik Pengaruh Variasi Sudut Heliks Terhadap Performa Turbin Air Sumbu Vertikal (VAWT) Tipe Gorlov Empat Sudu

Gibran Alif Firmansyah, Rizal (2026) Studi Numerik Pengaruh Variasi Sudut Heliks Terhadap Performa Turbin Air Sumbu Vertikal (VAWT) Tipe Gorlov Empat Sudu. Other thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Turbin air sumbu vertikal (Vertical Axis Water Turbine/VAWT) tipe Gorlov merupakan pengembangan dari turbin Darrieus yang dirancang untuk mengatasi masalah fluktuasi torsi dan kemampuan self-starting yang rendah. Kinerja turbin Gorlov sangat dipengaruhi oleh geometri sudu, salah satunya adalah sudut kemiringan sudu atau sudut heliks. Penelitian ini bertujuan untuk menganalisis pengaruh variasi sudut heliks terhadap performa turbin Gorlov dengan konfigurasi empat sudu. Metode penelitian dilakukan melalui studi numerik 3D menggunakan Computational Fluid Dynamics (CFD) dengan perangkat lunak ANSYS Fluent. Model turbulensi yang digunakan adalah Shear Stress Transport (SST) k-omega untuk memprediksi karakteristik aliran di sekitar sudu. Variasi sudut heliks yang diuji adalah 45^°,60^°,dan 90^° (sudu lurus baseline) pada rentang Tip Speed Ratio (TSR) 1,5 hingga 3,5 dengan kecepatan inlet konstan 1,64 m/s. Parameter unjuk kerja yang dianalisis meliputi Koefisien Daya (C_p), Torsi Rata-rata (T), dan karakteristik lintasan aliran fluida (pathline). Hasil simulasi numerik menunjukkan bahwa seluruh variasi sudu mencapai titik performa puncak (Best Efficiency Point) secara konsisten pada kondisi TSR 1,5. Konfigurasi sudu heliks 45^° mencatatkan unjuk kerja paling superior dengan menghasilkan nilai C_p maksimum sebesar 0,5061 (efisiensi 50,61%) dan torsi puncak sebesar 8,1530 Nm. Di posisi kedua, sudu heliks 60^° menghasilkan C_p maksimal 0,4994 (49,94%), sementara sudu lurus 90^° memberikan performa paling rendah dengan C_p puncak sebesar 0,3352 (33,52%). Karakteristik visual vektor dan lintasan aliran mengonfirmasi bahwa penggunaan sudut heliks terbukti mampu mereduksi pelepasan pusaran aliran (flow separation) dibandingkan sudu lurus, sehingga putaran turbin menjadi lebih stabil. Penelitian ini menyimpulkan bahwa pemilihan sudut heliks yang tepat sangat krusial untuk memaksimalkan efisiensi ekstraksi energi hidrokinetik pada turbin Gorlov empat sudu.
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The Gorlov Vertical Axis Water Turbine (VAWT) is an advancement of the Darrieus turbine, specifically designed to address issues related to torque fluctuation and poor self-starting capability. The performance of the Gorlov turbine is significantly influenced by blade geometry, particularly the helical angle. This study aims to analyze the effect of helical angle variations on the performance of a four-bladed Gorlov turbine. The research methodology employs a 3D numerical study using Computational Fluid Dynamics (CFD) with ANSYS Fluent software. The Shear Stress Transport (SST) k-omega turbulence model is utilized to predict flow characteristics around the blades. The tested helical angle variations are 45^°,60^°,dan 90^° (straight blade baseline) within a Tip Speed Ratio (TSR) range of 1.5 to 3.5 under a constant inlet velocity of 1.64 m/s. Analyzed performance parameters include the Power Coefficient (C_p), Average Torque (T), and fluid pathline characteristics. The numerical simulation results demonstrate that all blade variations consistently achieved their Best Efficiency Point (BEP) at a TSR of 1.5. The 45^° helical blade configuration demonstrated the most superior performance, yielding a maximum C_p of 0.5061 (50.61% efficiency) and a peak torque of 8.1530 Nm. In the second position, the 60^° helical blade produced a maximum C_p of 0.4994 (49.94%), while the 90^° straight blade provided the lowest performance with a peak C_p of 0.3352 (33.52%). Visual analysis of velocity vectors and flow pathlines confirms that the application of a helical angle successfully reduces flow separation compared to the straight blade, resulting in a more stable turbine rotation. This study concludes that selecting the appropriate helical angle is crucial for maximizing hydrokinetic energy extraction efficiency in four-bladed Gorlov turbines.

Item Type:	Thesis (Other)
Uncontrolled Keywords:	Turbin Air Gorlov, Sudut Heliks, CFD, Efisiensi Turbin, Koefisien Daya, Gorlov Water Turbine, Helical Angle, CFD, Turbine Efficiency, Power Coefficient.
Subjects:	T Technology > TJ Mechanical engineering and machinery > TJ1058 Rotors T Technology > TJ Mechanical engineering and machinery > TJ266 Turbines. Turbomachines (General) T Technology > TJ Mechanical engineering and machinery > TJ808 Renewable energy sources. Energy harvesting.
Divisions:	Faculty of Vocational > Mechanical Industrial Engineering (D4)
Depositing User:	Rizal Gibran Alif Firmansyah
Date Deposited:	31 Jul 2026 05:01
Last Modified:	31 Jul 2026 05:02
URI:	http://repository.its.ac.id/id/eprint/140717

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