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Unformatted text preview: Thien Nguyen Salman Karim MAE 3183 Experiment 5 Air Drag Force Performed: 03/22/07 Due: 03/29/07 Submitted: 03/29/07 Abstract In this experiment, a detailed analysis was carried out in order to understand the phenomenon of airflow around objects. The main focus of this experiment will be towards the effects of air drag. Air drag is a factor, which affects us daily in many different aspects, which we sometimes do not notice. The phenomenon of air drag comes in to play whenever an over an object is traveling through a fluid e.g. walking in the park or flying an airplane. As a result it can inferred that factors such as shape, speed, fluid medium, and surface of the object are responsible for varying drag force acting on it. The objective of this experiment is to determine the coefficient of drag on four different shapes and they are a cylindrical rod, a solid sphere, a square rod and lastly an airfoil. After the investigation on the effects of airflow around the cylinder, the relationship between drag coefficient and Reynolds number was obtained. Then a plot of drag coefficient versus Reynolds number is acquired in loglog scale. The results of the experiment show that there is a direct correlation between fluid velocities, drag force, and drag coefficients. At higher Reynolds numbers the more streamline bodies such as the airfoil have lower coefficients of drag, and nonstreamline bodies experience much larger drag forces and coefficients. This holds true because it has been proven through various fluid mechanics principles. Therefore, it is concluded that streamline geometries experience less drag than nonstreamline structures. 2 Table of Content 1. Introduction4 2. Experimental Setup7 3. Results and Discussion..9 4. Conclusion.11 5. Bibliography..12 6. Appendix....14 7. Sample Calculation....17 8. Uncertainty Analysis..18 3 Introduction The purpose of the wind tunnel experiment is to determine the air drag coefficient of a cylinder and an airfoil. In order to determine this variable, it is necessary to evaluate the flow of air around the cylinder, and then estimate the effects of the shape and Reynolds number on different objects from data and graphs produced during the cylinder analysis. So the purpose of this experiment was to observe the relation between drag and an objects shape and Reynolds number by calculating the drag coefficient and relating it to the other parameters....
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 Spring '08
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