lab3_lecture - Purpose Test design Measurement system and...

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Unformatted text preview: Purpose Test design Measurement system and Procedures Uncertainty Analysis Purpose Examine the surface pressure distribution and wake velocity profile on a Clark-Y airfoil Compute the lift and drag forces acting on the airfoil Specify the flow Reynolds number Compare the results with benchmark data Uncertainty analysis for Pressure coefficient Lift coefficient Facility consists of: • Closed circuit vertical wind tunnel. • Airfoil • Temperature sensor • Pitot tubes • Load cell • Pressure transducer • Automated data acquisition system Test Design (contd.) Airfoil (=airplane surface: as wing) is placed in test section of a wind tunnel with free-stream velocity of 15 m/s. This airfoil is exposed to: Forces acting normal to free stream = Lift Forces acting parallel to free stream = Drag Only two dimensional airfoils are considered: Top of Airfoil: The velocity of the flow is greater than the free- stream. The pressure is negative Underside of Airfoil: Velocity of the flow is less than the free-stream. The pressure is positive This pressure distribution contribute to the lift Instrumentation • Protractor – angle of attack • Resistance temperature detectors (RTD) • Pitot static probe – velocity • Vertical Pitot probe traverse • Scanning valve – scans pressure ports...
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This note was uploaded on 12/08/2011 for the course MECHANICS 57:020 taught by Professor Fredrickstern during the Fall '10 term at University of Iowa.

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lab3_lecture - Purpose Test design Measurement system and...

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