Comparative Study of custom-constructed Wind Augmentation

Added on -2019-09-16

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Comparative Study of custom-constructed Wind Augmentation Shrouds on asmall-scale Wind TurbineAbstractWind shrouding experiments are conducted to investigate the influences of two custom-constructed wind augmentation devices: cone-shaped wind guide and a flanged diffuser shroud. A group of Industrial Technology students will develop both diffuser shrouds that will collect and accelerate the incoming wind. The tests will be carried out for three wind velocities (5 mph to 15 mph) in a laboratory setting to compare the influences of two shrouding devices on the power output. A small scale horizontal axis wind turbine will be used with 400 Watt power rating. The study will report the comparative measurements performed on an experimental small-scale wind turbine attached for both shrouding devices. IntroductionLarge scale wind shrouding devices are expensive to build and maintain, however, if usedproperly, the wind power is great source of renewable energy that gives the incentive to work on improving the technology (Foote, 2011). A recent study with a cone shaped wind guide system inside the shrouding resulted in more than 60% power outcome compared to a conventional bare wind turbine (Dakeev, 2014). Additionally, researchers reported that the wind augmentation device significantly influences power generation (Kosasih & Tondelli, 2012; Dakeev, 2011). The Betz Law states that no wind turbine can capture more than 59.3% of the kinetic energy in wind (Betz, 1966). Utility scale wind turbines achieve approximately 75% to 80% of the Betz limit at their peak (Burton, 2001). Although Betz Law limits the wind turbines from
producing no more than 59.3% Hansen (2000) reported that enclosing the wind turbine within the shroud can improve the power generation beyond the Betz limit (Hansen, 2000). The purposeof this study is to design and construct the optimal wind shrouding device to amplify the incoming wind velocity for more efficient power generation. The authors of this study, all three with different backgrounds, constructed four custom designed wind augmentation devices to investigate the potential wind increase. One of the authors, a student with Business background, was given the opportunity to work on this project and be exposed to both 3D modeling and printing, building, testing the models, as well as data analysis.Literature ReviewConstantly changing wind velocities require building a dynamic wind shroud with sensors to determine the optimal relationship between wind velocity and angle wind shrouding adjusts to for better power generation. However, determination of the optimal design of the wind augmentation device plays a crucial role on the efficiency of power generation. Ohya and Karasudari developed a collection-acceleration device for wind in 2010, which was a diffuser shroud equipped with brim, called wind – lens (Ohya & Karasudari, 2010). They tested two types of hollow-structure models; a nozzle, and a diffuser type. Their experiments revealed that the diffuser-shaped structure could accelerate the wind at the inlet. Another research in 2014 reported that the power generated by an experimental small-scale wind turbine increased more than 60% (Dakeev, 2014) when the shroud was introduced. The researcher tested and analyzed the wind shrouding to evaluate the performance of the wind turbine at various wind velocities. Dakeev and his team concluded that power generation significantly increased with the wind shrouding system (Dakeev, 2014; Dakeev & Mazumder, 2015). Additionally, Tondelli and Kosasih in 2012 approached the wind shrouding with a different design. They added a flange to
the exit of the diffuser and suggested the brim design should be incorporated in the shroud designs (Kosiah & Tondelli, 2012). This paper discusses how various designs of the shrouds can affect the wind velocity at the inlet and the outlet of the wind augmentation devices.MethodologyThe study involves both testing and analyzing the custom designed wind augmentation devices (Figure 1) to evaluate the efficiency of air flow. For the phase one, the designs of three shrouds, 200, 250, and 300, were 3D printed to investigate the wind velocity change between inlet and the outlet. This study was very beneficial for the authors themselves, knowing they are all with different background experiences. One of the authors with Civil Engineering background, was provided with the ability to learn 3D modeling, as well as 3D printing.A miniature blower, with the outlet diameter of 7 inches, was utilized to produce an artificial wind in a closed environment as shown in Figure 1. A total number of 90 readings fromthe anemometer were collected in the laboratory setting for all three designs as illustrated in Figure 1: Construction of wind augmentation devices

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