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IDL - International Digital Library Of Technology & Research Volume 1, Issue 5, May 2017

Available at: www.dbpublications.org

International e-Journal For Technology And Research-2017

Review of a Shrouded Wind Turbine for Low Wind Speeds Ajeet Kumar Yadav1, Devesh Kumar2 1, M. Tech Scholar, Mechanical Engineering Department, MMMUT, Gorakhpur, INDIA 2, Assistant Professor, Mechanical Engineering Department, MMMUT, Gorakhpur, INDIA ABSTRACT The use of renewable energy is promoted worldwide to be less dependent on fossil fuels andnuclear energy. Therefore research in the field is driven to increase efficiency of renewable energy systems. This study aimed to develop a wind turbine for low wind speeds. The extent of power increase, or augmentation, the factors influencing shrouded wind turbine performance, the optimal geometry and economical benefit remained unanswered. The most important matter at hand when dealing with a shrouded wind turbine is to determine if the overall diameter or the blade diameter of the turbine should be the point of reference. As the wind turbine is situated in a shroud that has a larger diameter than the turbine blades, some researchers believe that the overall diameter should be used to calculate the efficiency Theory was revised to determine the available energy in the shroud after initial calculations showed that the power coefficients should have been higher than the open wind turbine with the same total diameter. A new equation was derived to predict the available energy in a shroud.

The worldwide increase in demand for energy and the obligation to protect the environment further rnecessitates the use of renewable energy. One such renewable energy resource that can be used iswind energy. The use of wind mills to produce energy from wind power dates back as far as 3000years. From the late nineteenth century wind mills with generators (wind turbines) have been used to generate electricity. [1] As the demand for energy increased, it became clear that it will be necessary to locate windturbines at certain terrains and regions which previously have not been considered suitable. Theseterrains and regions may have gust, turbulence and low wind speeds or other physical constraints.Progressively more wind turbines tend to be installed at such complex terrains [2]. Also, recently more efficient designs have been introduced for low wind speeds as well asfor urban use where turbulence, noise levels and appearance needed to be considered and addressed [3]. Some new designs propose that the turbine forms part of a buildingand/or structures. Other designs apply turbines in conjunction with solar panels or other typeâ€&#x;s ofrenewable energy systems [4]. 2. CHALLENGES

1. INTRODUCTION During the last years, significant progress has been made to understand the diffuser technology. Thus, new ideas have emerged on the origin of those technologies due to the potential increase in efficiency that diffuser devices produce in wind turbines, particularly for small wind turbines.Numerous investigations relative to shrouded Wind Turbine, or shrouded wind turbines concept over the last century were done. IDL - International Digital Library

Most of the wind turbines that are on the market have been developed in countries that have higher mean wind speeds. The imported wind turbines are designed to have high Cp values at higher wind speeds. These wind turbines will not generate much energy except for the period of time that the wind velocity is high. Also, a wind turbine that is optimized for high wind speeds usually have reduced efficiency at low wind speeds. These wind turbines will fail to start rotating at low wind speeds [5]. Locally designed wind turbines also 1|P a g e

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