Wind Turbine Efficiency Enhancement by CoFlow Jet Airfoil

2022 ◽  
Author(s):  
Yan Ren ◽  
Kewei Xu ◽  
Gecheng Zha
2020 ◽  
Vol 1 (2) ◽  
pp. 61-67
Author(s):  
Mohammad Rizqi Saputra ◽  
Nur Kholis ◽  
Mohammad Munib Rosadi

Abstract Wind is a renewable mechanical energy source that can be used as an energy source because the energy from the wind can be used to drive wind turbines. Savonius wind turbine type L is a tool to convert wind energy into electricity with a simple construction and can work with low wind speeds. The purpose of this study was to determine the effect of differences in diameter and number of blades on the power produced. The method used is a simulation method with an artificial wind source. With a wind speed of 8 m/s. The data analysis technique used is 2-way ANOVA using the SPSS application. Variations used are 20 cm and 40 cm in diameter and the number of blades 2 and 4 . The result is a wind turbine with a variation of 40 cm and 4 blades capable of producing the best output which produces 350.98 RPM voltage of 11.64 volts current of 0.144 amperes and power of 1,676 watts. As for BHP, torque, and turbine efficiency with a variation of 40 cm and 4 blades capable of producing the best output where the generated BHP is 3.352 watts, torque 0.091 N / m efficiency 2.17. For the results of calculations with SPSS wind turbines with a diameter variation of 40 cm and 4 blades, the biggest power is 1,744 watts and for BHP produces 3.3520 watts and the efficiency reaches 2.17%. Keyword : Diameter, number of blade, Performance Abstrak Angin adalah sumber energi mekanik yang bisa diperbaharui sehingga dapat dimanfaatkan sebagai sumber energi karena dapat digunakan untuk menggerakkan turbin angin. Turbin angin savonius tipe L merupakan alat untuk mengubah energi angin menjadi listrik dengan konstruksi yang sederhana dan dapat bekerja dengan kecepatan angin yang rendah. Tujuan penelitian ini untuk mengetahui pengaruh perbedaan diameter dan jumlah sudu terhadap unjuk kerja yang dihasilkan. Metode yang digunakan adalah metode simulasi dengan sumber angin buatan. Dengan kecepatan angin 8 m/s. Teknik analisis data yang digunakan adalah ANOVA 2 arah dengan menggunakan aplikasi SPSS. Variasi yang digunakan adalah diameter 20 cm dan 40 cm serta jumlah sudu 2 dan 4. Hasilnya turbin angin dengan variasi 40 cm dan 4 sudu mampu menghasilkan output terbaik yang dimana menghasilkan RPM 350,98 tegangan 11,64 volt arus 0,144 ampere dan daya 1,676 watt. Sedangkan untuk BHP, torsi, dan efisensi turbin dengan variasi 40 cm dan 4 sudu mampu menghasilkan output yang terbaik dimana BHP yang dihasilkan adalah 3,352 watt, torsi 0,091 N/m efisisensi 2,17. Untuk hasil perhitungan dengan SPSS turbin angin dengan variasi diameter 40 cm dan 4 sudu menghasilkan daya terbesar yakni 1,744 watt dan untuk BHP menghasilkan 3,3520 watt dan efisiensinya mencapai 2,17 % untuk torsi tertinggi dicapai turbin variasi 40 cm 2 sudu dengan torsi 0,116.   Kata kunci : diameter, jumlah sudu, unjuk kerja


Energies ◽  
2019 ◽  
Vol 12 (13) ◽  
pp. 2543 ◽  
Author(s):  
Piotr Doerffer ◽  
Krzysztof Doerffer ◽  
Tomasz Ochrymiuk ◽  
Janusz Telega

The paper presents a new concept of a vertical axis wind turbine. The idea is focused on small wind turbines, and therefore, the dominating quality is safety. Another important necessary feature is efficient operation at small winds. This implies an application of the drag driven solution such as the Savonius rotor. The presented concept is aimed at reducing the rotor size and the cost of implementation. A new wind turbine solution, its efficiency, and functionality are described. The results of numerical simulations being a proof of the concept are reported. The simulations were followed by wind tunnel tests. Finally several prototypes were built and investigated for a longer period of time. The new wind turbine concept has undergone various testing and implementation efforts, making this idea matured, well proven and documented. A new feature, namely, the wind turbine size reduction at strong winds, or in other words, an increase in the wind turbine size at low winds is the reason why it is difficult to compare this turbine with other turbines on the market. The power output depends not only on the turbine efficiency but also on its varying size.


2015 ◽  
Vol 772 ◽  
pp. 90-95 ◽  
Author(s):  
Ion Mălăel ◽  
Valeriu Drăgan ◽  
Georgel Vizitiu

In this paper, numerical studies have been conducted in order to evaluate the efficiency of a vertical axis wind turbine by using CFD methods. For these studies, it has been used SIMPLE type pressure-based coupled solver. The complexity and the unsteadiness character of the flow in such a machine, requires the use of unsteady RANS models. To determine the accuracy of the solution obtained by URANS models, this paper makes a comparative analysis with the same case and LES modeling. Analyses were performed with a 2D grid consisting of two regions, a rotor and a stator. The airfoil of the VAWT is a classic NACA0018. Results indicate that the poor accuracy of the URANS CFD method is mainly due to its limitation in the vortex modeling. In general the LES modeling have a better agreement with the experimental results from the wind tunnel.


Author(s):  
Arun K.K ◽  
Navaneeth V.R ◽  
Sam Vimal Kumar S ◽  
Ajay R

2017 ◽  
Vol 32 (1) ◽  
pp. 72
Author(s):  
Ana Herminia Machado ◽  
Fabiano Subtil Da Silva ◽  
Lúcio Passos Patrocínio

Este artigo evidencia um estudo preliminar de dimensionamento de um parque eólico com base nos dados obtidos pelo INMET – Instituto Nacional de Meteorologia apresentando os conceitos aplicados para a geração de energia sustentável. Propõe-se um estudo que apresenta a implantação de um parque eólico em uma região do Espirito Santo, comparando a média de velocidade dos ventos anuais em cada região (Linhares e Presidente Kennedy), analisando qual região será mais viável a implantação, a escolha do modelo de aerogerador e a análise da melhor eficiência para implantação do parque eólico. Os resultados obtidos mostram que o munícipio de Presidente Kennedy apresenta o melhor potencial para o dimensionamento do parque visto que apresenta a melhor estabilidade na direção dos ventos (Nordeste seguido de Leste-Nordeste) e a melhor média de velocidade de 3,7m/s. A partir da escolha da região foi escolhido o aerogerador para o parque (modelo Enercon E-82/2000KW com torre de concreto de 98 metros), e calculado a melhor eficiência que o parque poderá operar que é de 75,095%. Operando-se nessa eficiência o parque contará com 27 aerogeradores distribuídos em três fileiras numa área de 8000m2 podendo produzir uma energia anual em torno de 74079,183 MWh.Palavras-chave: parque eólico, aerogerador, eficiência. RENEWABLE ENERGY: PROPOSAL FOR WIND FARM SCALING OF ESPÍRITO SANTOABSTRACT: This article shows a preliminary study of the design of a wind farm based on data obtained by INMET - National Institute of Meteorology presenting the concepts applied for the generation of sustainable energy. It is proposed a study that presents the implementation of a wind farm in a Espirito Santo region, comparing the average speed of the annual winds in each region (Linhares and Presidente Kennedy), analyzing which region will be more feasible the implantation, the choice of Wind turbine model and the analysis of the best efficiency for the implementation of the wind farm. The results show that the municipality of Presidente Kennedy presents the best potential for the dimensioning of the park since it presents the best stability towards the winds (Northeast followed by East-Northeast) and the best average speed of 3.7m / s. From the choice of the region, the wind turbine was chosen for the park (model Enercon E-82 / 2000KW with a concrete tower of 98 meters), and the best efficiency that the park can operate is calculated to be 75.095%. Operating in this efficiency the park will have 27 wind turbines distributed in three rows in an area of 8000m2 and can produce an annual energy around 74079,183 MWh.Keywords:  wind farm, wind turbine, efficiency.


2017 ◽  
Vol 5 ◽  
pp. 59-63
Author(s):  
Segei Udalov ◽  
Andrei Achitaev ◽  
Alexandr Pristup ◽  
Dmitry Toporkov

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