Studi Eksperimental Pengaruh Variasi Geometri Alur Clamshell pada Permukaan Bilah terhadap Performa Hidrodinamis Turbin Savonius

Wahyudo, Dio Alif (2026) Studi Eksperimental Pengaruh Variasi Geometri Alur Clamshell pada Permukaan Bilah terhadap Performa Hidrodinamis Turbin Savonius. Other thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Target peningkatan bauran energi baru terbarukan (EBT) nasional mendorong pemanfaatan energi arus laut Indonesia yang umumnya memiliki kecepatan relatif rendah. Turbin Savonius berpotensi dikembangkan pada kondisi tersebut karena mampu beroperasi pada tip speed ratio (TSR) rendah, namun masih memiliki keterbatasan pada efisiensi konversi energi. Penelitian ini bertujuan meningkatkan performa hidrodinamika turbin Savonius melalui modifikasi permukaan bilah menggunakan struktur groove yang terinspirasi dari cangkang kerang (clamshell). Pengujian dilakukan secara eksperimental di towing tank menggunakan metode motor control untuk mengevaluasi karakteristik torsi, daya, Coefficient of power (Cp), Coefficient of Torque (Ct), dan kemampuan self-start. Hasil penelitian menunjukkan bahwa variasi Clamshell 3 menghasilkan performa terbaik dibandingkan model dasar dan variasi lainnya. Nilai maksimum Cp dan Ct meningkat sebesar 7,67% dibandingkan base model. Selain itu, kemampuan self-start mengalami peningkatan signifikan dengan kenaikan kecepatan putar awal sebesar 141%.
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The national target for increasing the share of renewable energy has encouraged the utilization of Indonesia’s marine current energy resources, which are generally characterized by relatively low flow velocities. The Savonius turbine is considered a promising technology for such conditions due to its ability to operate at low tip speed ratios (TSR). However, its energy conversion efficiency remains relatively limited. This study aims to enhance the hydrodynamic performance of a Savonius turbine through blade surface modification using a groove structure inspired by the geometry of a clamshell. Experimental investigations were conducted in a towing tank employing a motor-control method to evaluate torque, power output, power coefficient, torque coefficient, and self-starting characteristics. The results demonstrate that the Clamshell 3 configuration achieved the best overall performance among all tested models. The maximum values of Cp and Ct increased by 7.67% compared with the base model. Furthermore, the self-starting capability was significantly improved, as indicated by a 141% increase in the initial rotational speed. These findings suggest that the proposed clamshell-inspired groove configuration effectively enhances the aerodynamic interaction between the flow and blade surface, leading to improved torque generation and overall turbine performance under low-current conditions.

Item Type:	Thesis (Other)
Uncontrolled Keywords:	Turbin Savonius, groove, towing tank, motor control, self-start. Savonius turbine, groove, towing tank, motor control, self-start.
Subjects:	Q Science > QC Physics > QC151 Fluid dynamics V Naval Science > VM Naval architecture. Shipbuilding. Marine engineering > VM740 Marine turbines
Divisions:	Faculty of Marine Technology (MARTECH) > Ocean Engineering > 38201-(S1) Undergraduate Thesis
Depositing User:	Dio Alif Wahyudo
Date Deposited:	29 Jul 2026 01:23
Last Modified:	29 Jul 2026 01:23
URI:	http://repository.its.ac.id/id/eprint/139407

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