Analisis Pengaruh Variasi Posisi Deflektor Aliran Terhadap Performa Turbin Savonius Tipe Rotor Modified Bach

Ramadhani, Maulana Akbar (2022) Analisis Pengaruh Variasi Posisi Deflektor Aliran Terhadap Performa Turbin Savonius Tipe Rotor Modified Bach. Other thesis, Institut Teknologi Sepuluh Nopember.

Text 04311840000080-Undergraduate_Thesis.pdf - Accepted Version Restricted to Repository staff only Download (10MB) | Request a copy

Abstract

Arus laut merupakan salah satu sumber energi baru terbarukan yang berpotensi untuk
dikembangkan di Indonesia. Salah satu teknologi konversi arus laut adalah turbin Savonius
sumbu vertikal. Meskipun memiliki desain yang simpel dan cut-in speed rendah, turbin jenis
ini memiliki performa yang lebih rendah dibandingkan turbin sumbu vertikal lainnya. Solusi
untuk mengatasi kekurangan tersebut adalah mengembangkan tipe rotor yang lebih optimal.
Salah satu contohnya adalah rotor modified Bach yang memiliki performa 27% lebih tinggi
dibandingkan rotor Savonius konvensional. Selain itu, juga dapat ditambahkan deflektor aliran
yang mampu menghalangi aliran fluida yang akan mengenai returning blade turbin. Hal ini
dapat mengurangi torsi negatif yang dapat menurunkan performa turbin Savonius. Penelitian
ini akan menganalisa pengaruh posisi deflektor aliran terhadap performa turbin Savonius tipe
rotor modified Bach. Analisis dilakukan dengan metode computational fluid dynamics
menggunakan software Ansys Fluent. Studi kuantitatif menunjukkan bahwa posisi optimal
deflektor aliran merupakan variasi yang memiliki jarak paling dekat dengan turbin, dengan
rata-rata peningkatan koefisien momen sebesar 13,92% dibandingkan konfigurasi tanpa
deflektor aliran. Peningkatan koefisien momen paling tinggi dihasilkan saat TSR 1,02 dengan
nilai 0,37, yang mewakili peningkatan sebesar 50,83% relatif terhadap konfigurasi tanpa
deflektor. Studi kualitatif menunjukkan bahwa posisi optimal deflektor dapat mencegah
separated flow untuk memasuki area bertekanan rendah antara deflektor dan turbin, sehingga
dapat mengurangi torsi negatif yang dihasilkan turbin.
======================================================================================================================================
Ocean current is one of the renewable energy resources that has the potential to be
developed practically in Indonesia. Vertical axis Savonius turbine can be used to convert its
kinetic energy into electricity. Although it has a simple design and low cut-in speed, Savonius
turbine is less efficient than the other type of vertical axis turbine. One solution to overcome
this issue is to develop a more optimal rotor. One of which is the modified Bach rotor, which
has 27% more performance compared to conventional rotor. Moreover, the use of flow
deflector can potentially increase its performance even further, by blocking the fluid flow that
can hinder the returning blade of the turbine. This can reduce the negatice torque which could
decrease turbine performance. The present study aims to analyze the effect of flow deflector
position on the performance of Savonius turbine with modified Bach rotor. The computational
fluid dynamics simulation will be done using Ansys Fluent. Quantitative study has shown that
the optimal deflector position is the one with the closest distance to the turbine, with average
moment coefficient increase of 13,92% compared to the non-deflector configuration. The
highest moment coefficient increase was found at TSR 1,02 with the value of 0,37, which
translates to about 50,83% increase relative to the non-deflector configuration. Qualitative
study revealed that the optimal deflector position prevented the separated flow from re-entering
the low pressure area between the deflector and the turbine, which leads to better performance
due to decreased negative torque.

Item Type:	Thesis (Other)
Additional Information:	RSKe 621.406 Ram a 2022 3100022094020
Uncontrolled Keywords:	turbin Savonius, rotor modified Bach, deflektor aliran, computational fluid dynamics
Subjects:	T Technology > TJ Mechanical engineering and machinery > TJ870 Hydraulic turbines.
Divisions:	Faculty of Marine Technology (MARTECH) > Ocean Engineering > 38201-(S1) Undergraduate Thesis
Depositing User:	ansi aflacha
Date Deposited:	16 Dec 2025 04:53
Last Modified:	16 Dec 2025 04:53
URI:	http://repository.its.ac.id/id/eprint/128990

Actions (login required)

View Item