Answer / manojsub

Actually not only in aerofoil even in engines, nose of the
a/c, and etc. This is coz when the speed of the a/c exceeds
the speed of sound then the air particles beyond the
aircraft will not get any info what is coming at it. So it
will collide on the a/c so the pressure of the air particle
beyond that A/c increases. So the speed of the a/c will be
reduced.

Answer / guest

Shaock Only at supersonic speed

Message(about aircraft prasence downstream) waves go
upstream at the speed of sound.

But Aircraft goes more than the speed of sound.(supersonic)

Before upstream air get the message about aircraft prasence,
air encouter the aircraft.
No time to adjust the airflow,Hence Shock!

What do you mean by ducting?

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