Analysis of a Custom Constructed Wind Augmentation Device

Added on - 16 Sep 2019

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Analysis of a Custom Constructed Wind Augmentation Device with 30Degree Inlet Section to Improve Wind Power GenerationUlan DakeevAssistant Professor in Industrial Management & Technology, Texas A&M University -KingsvilleUlan.dakeev@tamuk.eduFarzin HeidariAssociate Professor in Industrial Management & Technology, Texas A&M University -KingsvilleFarzin.heidari@tamuk.eduBhavana KashibhatlaMasters in Industrial Management & Technology, Texas A&M University - KingsvilleBhavana.kashibhatla@students.tamuk.eduAbstractThe purpose of this research is to build and test a wind augmentation device that mightimprove power generation of an experimental small scale wind turbine. Testing of the windturbine with shroud is conducted to justify the means of adding a shroud around a windturbine to increase the speed of airflow thus generating more energy from the wind turbine.Researchers developed a wind turbine system with shroud through which the power efficacycan be improved and a cone to allow the incoming airflow from the wind turbine for a greateroutput.Previous research revealed that a shroud with 30 degree angle connected to the windturbine can deliver significantly improved performance and power efficiency when comparedto other shrouded wind augmentation devices with different angles[1].For this study theauthors constructed a large wind augmentation device in which the angle of the inlet remains30 degrees. The device measures 100 inches in length and 50 inches outlet diameter. A coneof 20 inches height and 10 inches diameter is inserted into the shroud. The performance ofthe shrouded wind turbine is experimentally and numerically investigated at various windspeeds as well as power output. Furthermore, the power output parameter was comparedbetween shrouded wind turbine with a cone and a shrouded wind turbine without a cone. Theshrouded wind turbine with a cone has demonstrated power augmentation by a factor ofabout 65% compared with a wind turbine without cone, for a given turbine diameter andwind speed.IntroductionUtilization of wind energy dates back to 3000 years and was initially used to grind grain withdrive windmills, to propel ships and to pump water[2]. Conventional energy sources andnonconventional energy sources are the two types of energy sources available for powergeneration to the world. Because of the continuous price hikes, global warming issues andthe limited nature of the conventional energy sources like coal, petroleum, natural gas etc.Proceedings of The 2016 IAJC-ISAM International ConferenceISBN 978-1-60643-379-9
has made the authors of this paper to suggest that nonconventional energy sources like solarpower generation, wind power generation, MHD power generation, fuel cells, thermo-electricgeneration would be the best option to use as a source of power generation in future[3].From 3.5GW in 1994 to approximately 320GW of wind power production capacity by theend of 2013 projects that there has been a tremendous improvement in the application ofwind energy over the last two decades[1]. An important motivating factor for the authors ofthis paper to use wind energy for power production is a fact that wind energy is anonpolluting component and environmental friendly technique used in generating powerwhich does not emit carbon dioxide and any other toxic gases compared to fossil fuels ornuclear power generation[4].It was in 1951 John Brown & co have built the first utility grid connected wind turbine. Windturbines have been effectively generating power by converting kinetic energy present in thewind to mechanical energy which in turn converts in to electrical energy with the help of agenerator. In 2014, in order to encounter problems relating to the power demand with respectto the available current supply, China has installed large scale wind farms of capacity around114,609 MW wind energy which contributed 31% of the total wind power followed by USA,Germany, Spain and India which produced 65,879 MW, 39,165MW, 22,987 MW, and22,465 MW wind power respectively[5].Literature reviewMany Endeavors have been made till date in making best use of the natural resources togenerate energy and wind energy is one of them[6][7][8]. Though there are many projects whichinvolve power generation using wind energy the main concern is how to increase thethroughput of the wind within the tunnel and to concentrate wind on the blades of the turbine.According to Department of Mechanical Engineering-Gurion University of the Negev, theenergy production can be improved by increasing wind velocity through the blades of theturbine using shroud attachment in the tunnel[9]. In the present study, the researchers areusing a conical shroud in the wind tunnel because a conical member having a substantiallyconstantly increasing diameter in the wind flowing direction. In another embodiment, theconical member smoothly expands in the wind flowing direction.The efficiency of a conventional wind turbine is limited. Therefore, a wind turbine systemthat consists of a shroud with a cone was developed to overcome these weaknesses. As statedin 2014 Fifth International Conference on Intelligent Systems[10]the shroud with a cone hasthe role of collecting and accelerating the approaching wind, thus improving the efficiency ofthe wind turbine. In the numerical simulation, it was found that the shroud could acceleratethe approaching wind speed by a factor of 2.1 and augment the power output of a windturbine by 3 times[10]. However, in the shrouded wind turbine experiment, a velocityenhancement of 1.33 times was achieved and a power output augmentation of 2 times wasdemonstrated[10]. A collection-acceleration device was developed for wind, which was adiffuser shroud equipped with brim, called wind – lens. The researchers tested two types ofhollow-structure models; a nozzle, and a diffuser type. Their experiments revealed that thediffuser-shaped structure could accelerate the wind at the inlet[12]. Another research reportedthat the power generated by an experimental small-scale wind turbine increased more than60% when the shroud was introduced. The researchers tested and analyzed the windshrouding to evaluate the performance of the wind turbine at various wind velocities. TheProceedings of The 2016 IAJC-ISAM International ConferenceISBN 978-1-60643-379-9
conclusion is given that power generation significantly increased with the wind shroudingsystem[13] [14]. The researchers tested and analyzed the performance of wind shrouding with20, 25 and 30 degree angles respectively at various wind velocities and determined that theshroud with a 30 degree angles exhibited maximum performance at various wind velocities[11]MethodologyThe authors of this paper have modeled and 3D printed three different custom constructedshrouds with inlet angle 20,25,30. The shroud with 30 degree angle was selected as itdeliversignificantly improved performance and power efficiency when compared to other shroudedwind augmentation devices with different anglesand a large wind augmentation device wasmanufactured using galvanized steel as shown in Figure1. The device measures 60 inches inlength, 50 inches outlet diameter and 72 inches inlet diameter.Figure1 – Wind Augmentation DeviceA cone of 20 inches height and 10 inches diameter is inserted into the shroud as shown inFigure2. The cone was shaped and constructed to allow the incoming air flow for greateroutputProceedings of The 2016 IAJC-ISAM International ConferenceISBN 978-1-60643-379-9
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