ME 130L Lab_3 Fall 2010

ME 130L Lab_3 Fall 2010 - ME 130L 17910 17975 The...

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ME 130L 17910 – 17975 The University of Texas at Austin Mechanical Engineering Department Fall ’10 Dr. Hidrovo 1 ME 130L Experimental Fluid Mechanics Lab #3 - Wind Tunnel Measurements and Dimensional Analysis of a Scaled Down Wind Turbine I. Objectives This lab involves making velocity and pressure measurements as well as electrical output power of a model wind turbine in a wind tunnel and performing dimensional analysis. An extremely useful application of dimensional analysis is in performing experiments using scale models and extrapolating the results to full-size prototypes. In this lab, we will analyze power characteristics of two different types of model wind turbines, and compare the obtained results to the performance of a prototype GE 1.5 MW wind turbine (Figure 1). The objectives of this lab are to: 1. Gain experience in use of wind tunnels and common measurement instrumentation such as manometers, pressure transducers, and Pitot-static probes. 2. Measure the velocity profile behind the wind turbine rotor. 3. Investigate variations of static, stagnation, and dynamic pressure in the wind tunnel, including behind the wind turbine rotor. 4. Perform an uncertainty analysis on the velocity measurements. 5. Conduct dimensional analysis on the power generation of the wind turbine. II. Background Wind turbines are devices that extract power from the wind and convert it to electrical power (as opposed to a windmill , which is used for mechanical power generation ). Wind power is a Figure 1: Image of a model wind turbine in a wind tunnel. GE 1.5 MW wind turbines arranged in a wind farm. (Source: http://www.gepower.com)
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ME 130L 17910 – 17975 The University of Texas at Austin Mechanical Engineering Department Fall ’10 Dr. Hidrovo 2 renewable energy source, which is the primary reason it is becoming increasingly popular around the world as a means to keep up with the global energy demand. Although very promising with regard to energy production, wind turbines do suffer from a number of setbacks, such as production costs and the obvious constraint that they depend on the wind behavior and must be located in a region where wind blows, that is, far from traditional power grids. Despite these and other setbacks, wind turbines are expected to play a major role in meeting the global energy demands for many years to come. Wind turbines are typically characterized by the orientation of their axis of rotation, which results in two primary categories: vertical axis wind turbines (VAWT) and horizontal axis wind turbines (HAWT). Both types of wind turbines have advantages and disadvantages. HAWT are the more commonly used type, mainly because no VAWT to date has matched the efficiency of the HAWT. VAWT, however, are typically more space-efficient, which is why many are used in urban settings, such as on rooftops. In this lab, we will compare and contrast a traditional three- bladed HAWT and a three-bladed VAWT, which has been modeled after the giromill design.
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This note was uploaded on 09/05/2011 for the course ME 205 taught by Professor Koen during the Spring '07 term at University of Texas.

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ME 130L Lab_3 Fall 2010 - ME 130L 17910 17975 The...

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