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All Journal Journal of Engineering and Technological Sciences Sewagati
Septyaningrum, Erna
Departemen Teknik Fisika Institut Teknologi Sepuluh Nopember
Humanities Education Engineering Social Sciences

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Novel Design of a Vertical Axis Hydrokinetic Turbine –Straight-Blade Cascaded (VAHT–SBC): Experimental and Numerical Simulation Hantoro, Ridho; Septyaningrum, Erna
Journal of Engineering and Technological Sciences Vol 50, No 1 (2018)
Publisher : ITB Journal Publisher, LPPM ITB

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (455.594 KB) | DOI: 10.5614/j.eng.technol.sci.2018.50.1.5

Abstract

A promising technology to reduce dependency on fossil fuels is hydrokinetic energy conversion using either turbine and non-turbine technology. Hydrokinetic turbine technology is penalized by low efficiency and lack of self-starting. This study involved experimental testing and numerical simulation of a novel hydrokinetic turbine design, called a Vertical Axis Hydrokinetic Turbine – Straight-Blade Cascaded (VAHT–SBC). Three configurations of the design were tested. Model 1 had 3 passive-pitch blades, while Model 2 and Model 3 had 6 and 9 blades respectively, where the outer blades were passive-pitch and the others fixed-blade. Both in the experimental test and in the numerical simulation Model 3 outperformed the other two models. The Cp of Model 3 was 0.42, which is very close to the theoretical Cp for VAHTs (0.45). It worked properly at low TSR. A CFD simulation based on the RANS solver was performed to gain supplementary information for performance investigation. This simulation confirmed that the torque changes because of the change in angle of attack as the turbine rotates. Because they have different numbers of blades, each model has different periodical torque fluctuation patterns. This study verified that utilization of cascaded blades and a passive-pitch mechanism is able to improve turbine performance.
Novel Design of a Vertical Axis Hydrokinetic Turbine –Straight-Blade Cascaded (VAHT–SBC): Experimental and Numerical Simulation Ridho Hantoro; Erna Septyaningrum
Journal of Engineering and Technological Sciences Vol. 50 No. 1 (2018)
Publisher : Institute for Research and Community Services, Institut Teknologi Bandung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5614/j.eng.technol.sci.2018.50.1.5

Abstract

A promising technology to reduce dependency on fossil fuels is hydrokinetic energy conversion using either turbine and non-turbine technology. Hydrokinetic turbine technology is penalized by low efficiency and lack of self-starting. This study involved experimental testing and numerical simulation of a novel hydrokinetic turbine design, called a Vertical Axis Hydrokinetic Turbine – Straight-Blade Cascaded (VAHT–SBC). Three configurations of the design were tested. Model 1 had 3 passive-pitch blades, while Model 2 and Model 3 had 6 and 9 blades respectively, where the outer blades were passive-pitch and the others fixed-blade. Both in the experimental test and in the numerical simulation Model 3 outperformed the other two models. The Cp of Model 3 was 0.42, which is very close to the theoretical Cp for VAHTs (0.45). It worked properly at low TSR. A CFD simulation based on the RANS solver was performed to gain supplementary information for performance investigation. This simulation confirmed that the torque changes because of the change in angle of attack as the turbine rotates. Because they have different numbers of blades, each model has different periodical torque fluctuation patterns. This study verified that utilization of cascaded blades and a passive-pitch mechanism is able to improve turbine performance.
Site Test Performance and Numerical Study of Vertical Axis Hydrokinetic Turbine Straight Blade Cascaded (VAHT–SBC) Ridho Hantoro; Sarwono Sarwono; Fernando Parsaulian Panjaitan; Erna Septyaningrum; Nuril Hidayati
Journal of Engineering and Technological Sciences Vol. 53 No. 1 (2021)
Publisher : Institute for Research and Community Services, Institut Teknologi Bandung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5614/j.eng.technol.sci.2021.53.1.2

Abstract

The Vertical Axis Hydrokinetic Turbine – Straight Blade Cascaded (VAHT-SBC) is a type of energy generation technology developed to meet the increasing demand for renewable energy. Previous studies have been carried out to enhance the efficiency of the turbine through several aspects. To deploy a turbine on site, a study on its power generation and conversion is needed. In this research, the VAHT–SBC was integrated with a permanent magnet synchronous generator (PMSG) by a pulley and belt transmission system. This study was conducted by experimental and numerical analysis. The CFD simulation result showed that the highest torque of the turbine was found at 0° and 360°, with an average value of 23.923 Nm and with current velocity at 0.92 m/s. The experimental data showed that the voltage and frequency were proportional to the generator rotational speed and inversely correlated with the load given to the integration system. In the inverter, the voltage and frequency values were stable at 230 V and 56 Hz respectively. The VAHT-SBC prototype was able to produce a maximum power of 50 W on site, with a current velocity of 0.82 and 0.92 m/s.
Pelatihan Pembelajaran Optik Berbasis Daring untuk Guru IPA SMA/SMK/MA Se-Jawa Timur dalam Rangka Peringatan International Day of Light 2019 Aulia Muhammad Taufiq Nasution; Sekartedjo; Agus M Hatta; Iwan Cony Setiadi; Detak Yan Pratama; M Kamalul Wafi; Erna Septyaningrum; Ika Puspita
Sewagati Vol 4 No 1 (2020)
Publisher : Pusat Publikasi ITS

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

Kemajuan bidang Optik dan Fotonik saat ini sudah mencapai tahapan yang sangat cepat dan luar biasa, dengan berbagai inovasi teknologi yang telah dihasilkan. Perkembangan pesat ini telah berkontribusi besar dalam memudahkan dan mensejahterakan kehidupan, serta juga merevolusi perilaku kehidupan manusia saat ini. Sayangnya perkembangan pesat ini kurang didukung oleh materi pembelajaran Optik dan Fotonik di tingkat sekolah menengah, dimana pemahaman kebanyakan guru fisika dan siswa atas perkembangan terkini terlihat sangatlah kurang. Dalam konteks pentingnya kontribusi cahaya dalam berbagai aspek kehidupan manusia inilah UNESCO telah mencanangkan perayaan tahunan Hari Cahaya Internasional (International Day of Light - IDL) yang akan diperingati pada tanggal 16 Mei setiap tahunnya, dengan tujuan utama untuk meningkatkan pemahaman masyarakat umum akan peranan dan kontribusi cahaya dan teknologi berbasis cahaya dalam kehidupan keseharian, serta peranan sentralnya dalam perkembangan masyarakat global dimasa mendatang, khususnya pendidikan dan pencerahan sains bagi generasi muda di negara berkembang. Dalam konteks inilah kegiatan pelatihan untuk guru IPA di SMA se-Jawa untuk mengembangkan pembelajaran optik berbasis daring, dengan tujuan untuk memberikan wawasan kepada guru SMA agar dapat menyediakan pembelajaran daring untuk mata pelajaran IPA, khususnya Optik, yang menyenangkan bagi siswa SMA/SMK/ MA.
Co-Authors Agus M Hatta Aulia M.T. Nasution Aulia Muhammad Taufiq Nasution Detak Yan Pratama Detak Yan Pratama Fernando Parsaulian Panjaitan Hatta, Agus Muhamad Ika Puspita Ika Puspita Iwan Cony Setiadi Iwan Cony Setiadi, Iwan Cony M Kamalul Wafi Muhammad Kamalul Wafi Nuril Hidayati Ridho Hantoro Sarwono Sarwono Sekartedjo Sekartedjo