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T-45A/C TS, ADV & IUT Aero-02
High-Speed Flight
Sg 1, fr 2
PRESENTATION
Lesson Organization
I.
Effects of high-speed flight on aircraft 1.7.1.4.3
HIGH-SPEED FLIGHT
A. Flight Regimes 1.7.1.4.3
* Effects of high-speed
flight on aircraft
1.
Compressibility
* Methods used to overcome
effects and permit high-
speed flight
a.
Normally ignored in study of subsonic flight
Sg 1, fr 2a
b.
Not limited to flight greater than speed of sound
Flight Regimes
c.
Progressive and effect may be experienced well
below the speed of sound
2.
Flight Regimes
a.
Subsonic -- all airflow about the aircraft is
subsonic
b.
Transonic -- there is a mixed airflow about the
aircraft, that is part subsonic and part
Sg 1, fr 3
Pressure Wave
supersonic
Formation
c.
Supersonic -- all airflow about the aircraft is
supersonic
B. Velocity and pressure changes
1.
Occur as an object moves through an airmass
2.
Create pressure disturbances in the airflow
Sg 1, fr 4
surrounding the object
Subsonic Flow About
an Airfoil
a.
Series of pressure waves transmitted from one
Sg 1, fr 4, pg 1
molecule to another
Supersonic Flow
About an Airfoil
(1) Extend in all directions
Fig 1: Flow About an
(2) Spread well ahead of the object when
Airfoil
object is traveling at a slow speed
(3) Warn the air ahead and help the airflow
around the object
(9-99) Original
Page 2-3


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