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All Journal Jurnal Teknik ITS IPTEK Journal of Proceedings Series JMES The International Journal of Mechanical Engineering and Sciences
Vivien Suphandani Djanali
Department Of Mechanical Engineering, Institut Teknologi Sepuluh Nopember
Computer Science & IT Energy Engineering Materials Science & Nanotechnology Mechanical Engineering

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Studi Numerik Turbin Angin Darrieus dengan Variasi Jumlah Sudu dan Kecepatan Angin Rahmat Taufiqurrahman; Vivien Suphandani
Jurnal Teknik ITS Vol 6, No 1 (2017)
Publisher : Direktorat Riset dan Pengabdian Masyarakat (DRPM), ITS

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1256.167 KB) | DOI: 10.12962/j23373539.v6i1.21086

Abstract

Penelitian ini dilakukan agar didapatkan desain turbin angin terbaik yang mampu memanfaatkan tenaga angin seoptimal mungkin. Metode penelitian yang digunakan adalah penelitian numerik dua dimensi dengan analisis aliran unsteady menggunakan software STAR CCM+ 9.02.007-R8. Model turbin angin yang digunakan adalah turbin angin tipe Darrieus dengan profil airfoil sudu sesuai NACA 0024 dengan jumlah sudu 3 dan 4. Turbulence model yang digunakan adalah k-epsilon realizable. Metode meshing yang digunakan adalah automated mesh dengan tipe tetrahedral mesh. Kecepatan angin yang disimulasikan adalah sebesar 5, 7, 9, 11, 13, dan 15 m/s. Hasil yang diperoleh dari penelitian ini adalah visualisasi kontur kecepatan dan tekanan, serta data grafik berupa nilai torsi dan koefisien daya dari turbin angin Darrieus. Turbin angin Darrieus tiga sudu menghasilkan koefisien daya yang lebih tinggi daripada turbin angin Darrieus empat sudu dalam rentang TSR 1,08-1,28. Nilai koefisien daya tertinggi dari turbin angin Darrieus tiga sudu adalah 0,437 yang dicapai pada TSR 1,28. Namun turbin angin Darrieus empat sudu memiliki profil grafik torsi yang lebih stabil dibandingkan dengan turbin angin Darrieus tiga sudu.
Numerical Study of Savonius Wind Turbine with Fluid-Rotor Interactions Zain Lillahulhaq; Vivien Suphandani Djanali
IPTEK Journal of Proceedings Series No 1 (2019): 4th International Seminar on Science and Technology 2018 (ISST 2018)
Publisher : Institut Teknologi Sepuluh Nopember

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (556.024 KB) | DOI: 10.12962/j23546026.y2019i1.5106

Abstract

Previous numerical studies in the Savonius wind turbine mostly used constant angular velocity as input data, where the values were obtained from experiments. This process cannot be used in the design optimization of the turbine, in which the angular velocity of the modified turbine is not known a priority. In numerical simulation, the use of loading system to get constant angular velocity to control the tip speed ratio (TSR), tends to have fluctuating value on output data. Moreover, the values of angular velocity shall be the results from freestream flow and Savonius rotor interaction. This condition can be simulated by using fluid structure interaction (FSI) method. Three dimensional Savonius S wind turbine is simulated using unsteady Reynolds Averaged Navier Stokes (RANS). Inlet velocity and wind turbine inertia are used as input data. The flow is assumed to be incompressible, viscous, and uniform at the inlet. The turbulence model used is the Eddy Viscosity k-ω SST, with y+ < 1. The domain consists of a sliding mesh, which rotates in the overset mesh region. Simulation results Power Coefficient (CP) and angular velocity and compared with experimental result. This study is resulted a standard method for the Savonius wind turbine numerical study
Numerical Study of Impeller Trimming on a Centrifugal Pump Test Unit R. Aurick Nugraha Prawito; Vivien Suphandani Djanali; Alif Arif Wicaksono
JMES The International Journal of Mechanical Engineering and Sciences Vol 3, No 1 (2019)
Publisher : LPPM, Institut Teknologi Sepuluh Nopember, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j25807471.v3i1.9365

Abstract

Centrifugal pumps have an essential role in various industries. Impeller trimming is often performed to optimize the pump performance at a particular operating point. Impeller trimming refers to a reduction in the impeller outer diameter and thus causes a change in the velocity triangle on the impeller of a centrifugal pump. Three-dimensional, unsteady simulations were conducted numerically using moving mesh. This centrifugal pump has a backward-curved impeller with six blades, with an outer diameter of 120 mm and an outlet angle of 10◦ , which will be trimmed to a diameter of 114 mm. Trimming the impeller reduced the outer diameter so that the outlet angle of the relative velocity to the tangential direction, β2, automatically changed according to the blade shape. The simulation was done by varying the pump discharge. The simulation results were compared with the experimental results. The results obtained in this study include quantitative data and qualitative data. Qualitative data was the appearance of velocity profiles, velocity vectors, and pressure contours. Meanwhile, the quantitative data were in the form of suction pressure, discharge pressure, head calculation, and hydraulic power. The comparison of the results of the numerical simulation with the experimental results have the same trend, although the simulation tended to underestimate the head and hydraulic power. A decrease in head and hydraulic power of the pump due to trimming the impeller from the lowest discharge to the highest discharge is as much as 13% to 24%.
Numerical Study of Bach-bladed Savonius Wind Turbine with Varying Blade Shape Factor Kelvin Ibrahim; Vivien Suphandani Djanali; Nur Ikhwan
JMES The International Journal of Mechanical Engineering and Sciences Vol 4, No 2 (2020)
Publisher : LPPM, Institut Teknologi Sepuluh Nopember, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j25807471.v4i2.7839

Abstract

Savonius wind turbine with Bach-profile blades is considered in this study. Previous studies have shown that a rotor with the Bach-profile blade produces better performance than a standard Savonius turbine. This study focuses on the blade shape factor variations of the Bach-profile blade to give the best performance. Two-dimensional unsteady simulations are performed with moving mesh. The configuration being tested is the Savonius rotor with Bach-profile blades with an arc angle of 135◦ . The blade shape factor is varied 0.2, 0.3, 0.4 at a constant freestream velocity of 4 m/s, with a corresponding Reynolds number of 20,000. The k-ω Shear Stress Transport turbulence model was used, with secondorder discretization schemes for the pressure and momentum equations. The boundary conditions were set as velocity inlet for the inlet, outflow for the outlet, and walls for the blade surfaces. The top and bottom sides were set as symmetric. Results showed that the configuration with a shape factor of 0.4 gave the best performance among the others. This configuration gave a higher moment coefficient and power coefficient of about 6.8% and 7.3%, respectively. Results extracted from the simulation includes the flow structure, and the distribution of the pressure coefficients along the blade surface.
Numerical Study of Savonius Wind Turbine Rotor with Elliptic Angle Shape Variation Antonius Hadi Sudono Putranto; Vivien Suphandani Djanali; Bambang Arip Dwiyantoro
JMES The International Journal of Mechanical Engineering and Sciences Vol 3, No 2 (2019)
Publisher : LPPM, Institut Teknologi Sepuluh Nopember, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j25807471.v3i2.9367

Abstract

The Savonius wind turbine uses a half-cylinder blade which is often called a bucket assembled so that the cross-section forms an "S". This turbine is seen in the form of a half-cylinder consisting of a concave side and a convex side. This turbine is one type of Vertical Axis Wind Turbine (VAWT) that uses the difference in drag forces between the two buckets to be able to rotate the rotor. Therefore this rotor has the ability to self-start, which other wind turbines do not have, even so, the performance of the turbine. Savonius wind is still relatively low, so that it cannot be applied until now. Many studies have been carried out to improve performance, some of which include adding shielding, end plates, changing the shape of the blades, gap overlap, and others. The analysis in this numerical study included a comparison of the performance of conventional Savonius wind turbines and elliptic Savonius wind turbines with an assumed steady flow 2D flow and using turbulent viscous transitions k-kL-ω and k-ω SST with variations in flow velocity and angle of incidence of flow to the position of the rotor of the Savonius turbine. This results evaluated were the static torque coefficient with respect to the rotor position, the pressure distribution along the blade surface, and the wind flow characteristics near the rotor. The results of this study indicated that the modified wind turbine rotor had a higher static torque coefficient at low speeds. The two types of turbine rotors had relatively the same self-starting capability at high speeds.
Co-Authors Alif Arif Wicaksono Antonius Hadi Sudono Putranto Bambang Arip Dwiyantoro Kelvin Ibrahim Nur Ikhwan R. Aurick Nugraha Prawito Rahmat Taufiqurrahman Zain Lillahulhaq