MAE 150B Midterm-2-rev3

MAE 150B Midterm-2-rev3 - MAE 150B Midterm#2(Thursday 4-6...

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MAE 150B Midterm #2 Name: 5/15/2008 (Thursday 4-6 PM) UID: There could be more than one ways to obtain the answers. Unless you are instructed to give simple answer, write down how you obtain the answer. 1. (25 points) Answer the following questions with simple statements. If (T/F) (True or false) is asked, don’t blindly guess. A wrong answer will deduct half of the points assigned to it. a) (2 pts) According to the thin airfoil theory, thick airfoils usually have better performance at high angle of attack. ANS.: (T/F) ________ b) (2 pts) Thin airfoil theory can accurately predict the occurrence of stall. ANS.: (T/F) ________ c) (2 pts) A finite wing generally has lower lift slope than the 2-D wing of same cross sectional geometry ANS.: (T/F) ________ d) (2 pts) Lifting line theory predicts a smaller zero lift angle of attack,, when the aspect ratio, AR is reduced ANS.: (T/F) ________ e) (2 pts) Space shuttle has delta wing. It has a well-rounded leading edge because it has low drag at supersonic flight ANS.: (T/F) ________ f) (2 pts) When using “numerical nonlinear lifting-line theory”, we start with an initial guess of circulation distribution and iterative compute the circulation until a converged solution is obtained. It can predict the lift force
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