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Author

M. H. Nasef

Bio: M. H. Nasef is an academic researcher from Sinai University. The author has contributed to research in topics: Rotor (electric) & Wind tunnel. The author has an hindex of 1, co-authored 2 publications receiving 172 citations.

Papers
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Journal ArticleDOI
TL;DR: In this paper, different geometries of Savonius wind turbine are experimentally studied in order to determine the most effective operation parameters, it was found that, the two blades rotor is more efficient than three and four ones.
Abstract: For solving the world energy problem and the bad effect of conventional sources of energy on environment, great attention allover the world is paid towards the use of renewable energy sources. Special interest is paid towards wind energy because of its competitively. Savonius rotor is a vertical axis wind turbine which is characterized as cheaper, simpler in construction and low speed turbine. This makes it suitable for generating mechanical energy in many countries especially in Egypt. In this work different geometries of Savonius wind turbine are experimentally studied in order to determine the most effective operation parameters. It was found that, the two blades rotor is more efficient than three and four ones. The rotor with end plates gives higher efficiency than those of without end plates. Double stage rotors have higher performance compared to single stage rotors. The rotors without overlap ratio (β) are better in operation than those with overlap. The results show also that the power coefficient increases with rising the aspect ratio (α). The conclusions from the measurements of the static torque for each rotor at different wind speeds verify the above summarized results of this work.

231 citations

Journal ArticleDOI
01 Jan 2011
TL;DR: In this article, the Savonius rotor prototype was designed and tested in El-Arish at the Faculty of Engineering, Sinai University, and the results showed that the rotor gave considerable efficiency and began to give power at a relative low wind speed.
Abstract: In this work, it is planned to design and test a prototype of Savonius rotor in free wind based on the results of the previous experimental study. The prototype is designed and tested in El-Arish at the Faculty of Engineering, Sinai University. Although El-Arish has lower average yearly wind speed compared to other locations with higher average wind speed, like Hurghada. The results show that Savonius rotor prototype in El-Arish gives considerable efficiency and begins to give power at a relative low wind speed. While the energy generated from the Savonius rotor prototype in El-Arish is small, the cost of energy generated is competitive with other energy sources. The cost of kW hr generated from Savonius rotor is expected to be very low specially in locations with high average wind speed. The majority of the Egyptian locations having an average wind speed between 3.5 and 4.5 m/s. The cost of kW.hr generated from Savonius rotor in these locations is expected to be between 0.42 and 0.28 LE. In locations where average wind speed is 6 m/s, the cost of kW hr is expected to be 0.1 LE. Therefore the use of Savonius rotor will be attractive in many locations in Egypt and it can be used to pump water for irrigation of lands. This will save a great part of conventional energy sources used for this purpose and consequently reduces the environmental pollution. بط ُّيبرٕج تب زنط عنُ منًلج بناضأ يُنصحنا ةهٓطٔ ًٍثنا ةصيخر بَٓأب شيًحج ٗحنا ةيطأزنا تبُيبرٕحنا ٍي ْٗ ّيئإٓنا صٕيَٕف ّافخُي ءإْ , زصي بُٓئ ّييبُنا لٔعنا ٗف بٓياعخحطا ٍكًض ٗحنا ّيئإٓنا تبُيبرٕحنا مافا ٍي بٓهلجض كنذ . زحن ٗننٔأ وذٕنًَ ربناحخخٔ يُنصجٔ ىيًصج ىج مًلنا اذْ ٗف تبنطبي نا تئبنحَ ٗنه اعنًحلي زنتنا ءإنٓنا ٗنف ةنيئإٓنا صٕيَٕفبنط ةنُيب ةنيهكب مةنيكيَبكيًنا ٖٕن نا ةنطعُْ ىنظ ب موعن حًنا نئإًنا بنكيَبكيي منًلي ٗنف صٕيَٕفبط ةُيبزج ٍي وذبًَ ٗه ثضزجأ ٗحنا ةيهًلًنا ةيفًُٕنا ةليبج مةطعُٓنا . شضزلنا ةُضعي ٗف ٗنٔلأا وذًُٕنا رباحخخٔ يُصج ىج ءبُيط ةليبج مةطعُٓنا ةيهكب . شضزنلنا ٌأ ٍني ىأزنبنب اذنْ مةنافخُي نبنضر تب زنط عنُ ةقبط عينٕج ٗف أعاضٔ مةنٕ لي ةءبفكب مًلض ٗنٔلأا وذًُٕنا ٌا عجٔ ع نٔ ةافخًُنا نبضزنا تب زط تاذ ةضزصًنا قطبًُنا ٍي زاحلج . ٕحًنا ةنقبطنا ٍني منقا زاحلج صٕيَٕفبط ةُيبزج ٍي ةعنٕحًنا ةقبطنا ةءبنف ٌلأ كننذٔ ةنينبلنا تب زنظنا تاذ ةني فلأا تبنُيبزحنا ٍني ةعنن ةنقبطهن ٖزنخلأا رلبنصًنا ضفبنُجٔ ةنافخُي زناحلج صٕيَٕفبنط ةنُيبزج ٍني ةنجحًُنا ةنقبطنا ةعحٔ ةفهكج ٍكنٔ ممقأ صٕيَٕفبط ةُيبزج ةُيبزحنا ِذْ ءبشَلإ ةافخًُنا ةفهكحنا باظب كنذٔ . نُي ىظلي ٗف ةططٕحًنا نبضزنا ة زط ٌخ ٍينب ن ج زنصي قطب 3.54.5 m/s ٔ م دق ل ةنفهكج ٌأ عنجٔ kW hr ةنُيبزج ٍني تحنًُنا ٍيب حط زصي قطبُي ىظلي ٗف صٕيَٕفبط 0.42-0.28 LE ٗننخ منصحن ةنفهكحنا من ج إنط بنًُيب ماعنج ةننٕ لي ةنفهكج ٗنْٔ LE 0.1 ةططٕحًنا نبضزنا ة زط بٓب ٗحنا قطبًُنا ٗف m/s 6 . يبزج واعخحطخ ٌإف كنذنٔ ةزنيث قطبنُي ٗنف ةنقبطنا عينٕحن صٕيَٕفبط ةُ ةزنيا ةنيًْأ ّنن ٌٕكينط زنصي ٗنف . ٗن ارلأا ٖزنن ةنيس ا ِبنيًنا رنان تبناًهطنا ةرالخ ٗنف ةنُيبزحنا ِذنْ واعخحنطخ ٍنكًًنا ٍنئ ا ٍني بناضأ منه ض إنطٔ متباًهطنا ِذْ ةرالخ ٗف وعخحظًنا ٖعيه حنا لٕقٕنا ٍي ةنٕ لي تبيً زفٕض إط اذْ مةي ارشنا تبنثبلاَلإ ٗئيانا خٕهحهن ةااظًنا ةضرازتنا .

2 citations


Cited by
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Journal ArticleDOI
TL;DR: In this paper, an attempt has been made to review hydrokinetic energy theory for energy conversion system from water currents analogous to wind power system, and the most widespread classes of hydro-kinetic turbines are discussed in detail with respect to their benefits, drawbacks and desirable conditions for applications.
Abstract: Energy crisis and high emission of fossil fuels are major driving forces for developing renewable energy based technologies. In order to meet growing demand for energy, hydropower can be one of the sustainable alternatives. Further, the hydrokinetic turbine is considered as one of the most emerging technologies which harness energy from flowing water. In this paper, an attempt has been made to review hydrokinetic energy theory for energy conversion system from water currents analogous to wind power system. The most widespread classes of hydrokinetic turbines are discussed in detail with respect to their benefits, drawbacks and desirable conditions for applications. It has been found that in spite of some prevailing downsides of vertical axis turbine like of self-starting and lower efficiency, vertical axis turbines are appealing for many riverine applications. One of the prominent turbines of its kind is the Savonius hydrokinetic turbine that has the capacity to self-start at a very low fluid velocity in the river, canal etc. However, Savonius type hydrokinetic turbine inherently has poor efficiency. A number of experimental and numerical studies with a large number of physical designs and parameters have been carried out in the area of Savonius rotor to enhance its efficiency. Under this study, review of different parameters affecting the performance of Savonius hydrokinetic turbine has been carried out and presented in this paper which may be useful for future studies to improve the efficiency of such turbines.

132 citations

Journal ArticleDOI
TL;DR: In this paper, three methods of controlling the wind direction were proposed aiming at improving the performance of Savonius rotor, which achieved a power-coefficient peak of 0.52 with operation range of tip speed ratio λ ≤ 2.2.

125 citations

Journal ArticleDOI
TL;DR: In this paper, a CFD study is conducted in order to characterize the dynamic behavior of a Savonius vertical axis wind turbine, which is executed using the open source code, OpenFOAM.

114 citations

Journal ArticleDOI
01 Sep 2017-Energy
TL;DR: In this paper, the authors proposed a novel system of ducted nozzle configuration around the Savonius rotor to increase the efficiency of the turbine, and the maximum power coefficient of the ducted turbine was increased by 78% compared to the conventional modified rotor.

98 citations

Journal ArticleDOI
TL;DR: In this article, the performance of the Savonius hydrokinetic turbine (SHT) has been evaluated through simulation and experimental and computational fluid dynamics (CFD) analysis.

98 citations