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 TurbineI.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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