Air flow in Convergent divergent nozzle

  • Thread starter gkraju
  • Start date
16
0
i understood the air flow properties variation in convergent divergent / condi nozzle or laval nozzle for subsonic flow based on the formula, for a incompressible flow :

density * Area * velocity = constant
as the total pressure in the flow is constant dynamic pressure is minimum at the throat and static pressure is much more.

for subsonic flow, as the area decreases at the throat of the nozzle, velocity increases and after the throat as the area increases, velocity decreases, that is how velocity is maximum at the throat of the condi/laval nozzle.

once speed of the flow is slowly increased as the velocity of the flow reaches the velocity of sound i.e. M=1, the compressibility effects come into picture, how the flow properties i.e. velocity and dynamic pressure variations change.

1. it is said that for supersonic flow the velocity at the throat decreases where as the velocity increases as the throat diverges, why is it so, why the velocity variations are opposite to that of subsonic flow ?

2. And when does the shock wave forms in the condi nozzle ? how the shock wave forms if at all it forms ?

3 why the velocity in condi nozzle never exceeds M =1 ?
can any one please explain me in simple terms rather than math formulae.
 

Want to reply to this thread?

"Air flow in Convergent divergent nozzle" You must log in or register to reply here.

Related Threads for: Air flow in Convergent divergent nozzle

  • Posted
Replies
0
Views
2K
  • Posted
Replies
0
Views
2K
  • Posted
Replies
0
Views
5K
  • Posted
Replies
0
Views
4K
Replies
0
Views
5K
Replies
0
Views
869
Replies
0
Views
989
  • Posted
Replies
0
Views
2K

Physics Forums Values

We Value Quality
• Topics based on mainstream science
• Proper English grammar and spelling
We Value Civility
• Positive and compassionate attitudes
• Patience while debating
We Value Productivity
• Disciplined to remain on-topic
• Recognition of own weaknesses
• Solo and co-op problem solving

Hot Threads

Top