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# MAE 3241: Aerodynamics and Flight Mechanics March 4, 2005 Name: _________________ Exam #2 Exam is worth 100 points and has 4 questions (20/30/30/30)....

The figure below shows the flow over a cylinder with circulation, as discussed in class.

If we define an “angle of attack”, , as the angle between the horizontal and the stagnation streamline, derive a relationship between the lift coefficient, cl, as a function of the angle of attack.
MAE 3241: Aerodynamics and Flight Mechanics Name: _________________ March 4, 2005 Exam #2 Exam is worth 100 points and has 4 questions (20/30/30/30). Read each question carefully and show all your work. Short Answer Questions (5 Points Each): Answer these questions using as few words as possible or brief quantitative analysis when appropriate. 1. Will an NACA 2415 airfoil produce lift when it is flying upside down? 2. The baseball shown in the picture is immersed in a subsonic wind tunnel and smoke is injected to visualize the streamlines. Draw the direction of the lift force on the baseball: 3. An offshore power plant cooling-water intake sucks in 1500 ft 3 /s in water 30 ft deep, as shown in the figure on the right. If the tidal velocity approaching the intake is 1 ft/s, how far downstream does the intake effect extend? 4. An NACA 2415 airfoil has a chord length of 2 meters. a. What is the maximum thickness of this airfoil? b. What is the maximum camber of this airfoil and where is it located? c. What is the value of the lift slope? 1 Intake
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