AAE 334 EXAM 1 REVIEW QUESTIONS AND
ANSWERS 100% CORRECT
Blunt body and Slender body flow regime preferred? - ANSWER Slender body: Df >> Dp
Laminar flow is preferable for minimization of total drag
blunt body: Dp >> Df
Turbulent flow is preferable for minimization of total drag
Physical reason for downwash? - ANSWER Imbalance of pressure between upper and
lower surfaces of wing
Causes flow to "leak" upwards around wing tips
Causes creation of trailing vorticies
Induce downward component of air velocity along wing span
Physical reason for induced drag? - ANSWER lift vector aligned perpendicular to local
wind direction
trailing vorticies induce downwash
tilts local wind direction from vinf
tilts lift vector and causes appearance of component of lift force in inf
mathematical expression justifying statement that induced drag is drag due to lift? -
ANSWER Di = Li sin(alpha)
how does downwash very spanwise? (elliptic loading distribution?) - ANSWER
Downwash is constant spanwise for elliptic loading disribution
What quantities must balance to make the camber line a streamline? - ANSWER The
ANSWERS 100% CORRECT
Blunt body and Slender body flow regime preferred? - ANSWER Slender body: Df >> Dp
Laminar flow is preferable for minimization of total drag
blunt body: Dp >> Df
Turbulent flow is preferable for minimization of total drag
Physical reason for downwash? - ANSWER Imbalance of pressure between upper and
lower surfaces of wing
Causes flow to "leak" upwards around wing tips
Causes creation of trailing vorticies
Induce downward component of air velocity along wing span
Physical reason for induced drag? - ANSWER lift vector aligned perpendicular to local
wind direction
trailing vorticies induce downwash
tilts local wind direction from vinf
tilts lift vector and causes appearance of component of lift force in inf
mathematical expression justifying statement that induced drag is drag due to lift? -
ANSWER Di = Li sin(alpha)
how does downwash very spanwise? (elliptic loading distribution?) - ANSWER
Downwash is constant spanwise for elliptic loading disribution
What quantities must balance to make the camber line a streamline? - ANSWER The
