text: OBLIQUE SHOCK WAVE. Consider the 
  case where a supersonic airstream is turned 
  into 
  the preceding airflow. Such would be 
  the case of a supersonic flow “into a comer” 
  as shown in figure 3.3. A supersonic airstream 
  passing through the oblique shock wave will 
  experience these changes: 
  
  the 
  velocity and Mach number behind the wave 
  are reduced but the flow is still supersonic 
  
  (1) The airstream is slowed down; 
  
  (2) The flow direction is changed to flow 
  
  along the surface 
  
  (3) The static pressure of the airstrea:m 
  
  behind the wave is increased 
  
  (4) The density of the airstream behind 
  
  the wave is increased 
  
  (5) Some of the available energy of the 
  airstream (indicated by the sum of dynamic 
  and static pressure) is dissipated and turned 
  into unavailable heat energy. Hence, the 
  shock wave is wasteful of energy. 
  A typical case of oblique shock wave forma- 
  tion is that of a wedge pointed into a super- 
  sonic airstream. The oblique shock wave 
  If a blunt- 
  nosed object is placed in a supersonic airstream 
  is formed will be de- 
  the shock wave which 
  tached from the leading edge. This detached 