Page 291 - 48Fundamentals of Compressible Fluid Mechanics

14.6. FLAT BODY WITH ANGLE OF ATTACK 253
Prandtl-Meyer Angle

100

80
k=1.4

60
q

40

20

0
1 2 3 4 5 6 7 8 9 10
Mach Number

Fri Jul 8 15:39:06 2005

Fig. 14.6: Mach number as a function of

14.6 Flat Body with angle of Attack

Previously the thickness of a body was
shown to have drag. Now, A body with 1 2
3
zero thickness but with angle of attack
will be examine. As oppose the thick- ` w
ness of the body, in addition to the drag, 5
the body also obtains lift. Again, the slip 4 α Slip plane
condition is such that pressure in region 7
5 and 7 is the same in additional the di- 6
rection of the velocity must be the same.
As before the magnitude of the veloc-
Fig. 14.8: The definition of the angle for
ity will be different between the two re-
Prandtl–Meyer function here
gions.