1. Wind Tunnel Analysis Presented by: Mary Elizabeth Pozydaev ME 498 November 16, 2004

2. Overview ObjectivesBackground Experimental Procedure ResultsConclusions

3. Objectives To measure lift and drag components & determine their coefficients To learn how to use a wind tunnel & gain a basic understanding of its applications

4. Background - Wing Shape SymmetricalStreamlined Affects Coefficients of Lift and Drag

5. Background – Angle of Attack α = angle between the chord line and relative wind Lift = vertical force acting on wing Drag = horizontal force acting on wing to decrease lift

6. Experimental Procedure Wind Tunnel System (Bayless)

7. Procedure - Calibration Weight Application Diagram (Bayless)

8. Procedure - Data Adjustment Calibrations are applied to Lift & Drag calculations Baseline Drag & zero initial Lift are taken into consideration

9. Results

10. Conclusions An increasing angle of attack causes the Coefficients of Lift & Drag to increase After the stall angle has been reached, the Lift abruptly decreases A higher Re results in a higher velocity and causes a decrease in the Coefficients of Lift & Drag The results observed in a wind tunnel can be used for real world applications

11. Questions?