In a choked nozzle, velocity increases, and
- density decreases.
- pressure decreases.
- pressure increases.
Explanation from PART66Online
When a nozzle is choked the flow reaches sonic speed and, as it continues to expand and accelerate, the gas density falls. Pressure also drops rather than rising, so density decreasing is the correct accompaniment to the rising velocity.
A
add99 asked · 20 Apr 2012
Doesn't pressure decrease with an increase in velocity?
Community Comments (6)
R
rizkaramat
23 Apr 2012
in the case of a choked nozzle the velocity of air cannot excceed that of sonic speed there after that point the choked nozzle gets thrust by increased pressure inside the nozzle
I
imrannsk
2 May 2012
In all the cases, velocity increases with decrease in pressure. Remember the concept of 'lift' in 'aerofoil'... the upper portion has reduced pressure due to which the velocity increases and more force is created than the bottom portion. This is an example just to get you into the concept of Pressure & Velocity relation.
I
imrannsk
2 May 2012
So as you have written above, the answer stated above is Wrong.
A
avionics
27 Feb 2017
In a choke nozzle M=1 at the throat area.....
In a choke nozzle with subsonic velocity gas intake, the velocity of gas is M=1 at the choke point....nevertheless this is not the case if gas intake is already at sonic velocity upon entering the nozzle..And under sonic gas intake the speed at the throat might be higher sonic speed, M>1.
To back it up you may find it in convergence-divergent topic with compressible and incompressible air..
In a choke nozzle with subsonic velocity gas intake, the velocity of gas is M=1 at the choke point....nevertheless this is not the case if gas intake is already at sonic velocity upon entering the nozzle..And under sonic gas intake the speed at the throat might be higher sonic speed, M>1.
To back it up you may find it in convergence-divergent topic with compressible and incompressible air..
J
Jordi
6 Jul 2020
so is this answer correct?
D
Diverdeep
17 May 2023
before the choke always increase
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