AEROSPACE ejectors
THRUST ejectors
THRUST ejectors require very precise design. A well-designed thrust ejector may provide
about 1.10 to 3 times the direct jet thrust of the normal ejection of the supply flow.
Because of their size and shape, thrust ejectors usually require a special redesign of
the entire aircraft from the beginning. It is very difficult or even impossible to add
a thrust ejector to an existing aircraft. Thrust ejectors can be implemented in many
types and configurations. (photo aerodin)
Usual ejector types for this application are:
TURBOENGINE inside
TURBOENGINE inside ejectors can be used for air dilution, cooling, suction, compression,
mixing flows or other specific functions. An ejector working inside an aerospace engine
is a very precise device, designed to fit in a specific available volume and weight.
Usually, the ejector must be considered from the first design stage of the engine,
because some engine parts should be adapted to integrate the ejector. (photo www.jakpost.travel)
Usual ejector types for this application are:
HOVERCRAFTS
Using ejectors for HOVERCRAFTS represents an innovative concept. It was first designed
around 1970 by Clement Alecsandrescu from Romania, as a peripheral jet in order to
replace the hovercraft skirt. It is now possible to use hovercraft ejectors to generate
the air cushion, thrust, or both. Hovercraft ejector design may allow the use of the
skirt output flow to generate useful thrust by changing the way the fluid flows.
(photo Military hovercraft 8100 TD Griffon Hoverwork UK)
Usual ejector types for this application are:
ATMOSPHERE ROCKETS
In a special design of the ejector inside and outside the rocket body, the rocket thrust
can be increased. The ejector must be carefully designed to allow the flow to create
both lower pressure and higher pressure zones on the rocket body, generating an
additional lift of about 1.1–1.3 times. This design usually works in the dense layers
of the atmosphere and is typically used for the first stage of a space rocket.
(photo ARCA)
Usual ejector types for this application are:
DRONES
The future of flying DRONES moves towards designs with no mechanical moving parts,
especially on the exterior. This implies using high-thrust performance ejectors with
50–90% efficiency. There are many geometrical configurations of ejectors that may be
used for aerial drones in both subsonic and supersonic flight. The first known ejector
used for aircraft was designed by Henri Coanda in his lens-shaped (disk) configurations.
(photo Henri Coanda)
Usual ejector types for this application are:
WIND tunnels
WIND TUNNELS giant propellers can be replaced with ejector systems having no mechanical
moving parts in the working flow. Maintenance can be significantly reduced, as well as
cinematic risks including vibrations. Ejector systems may provide high-velocity wind
flows up to 200 m/s and more in the same wind tunnel. Useful applications include
testing high-speed vehicle designs in compressible flow. (photo NASA’s transonic wind tunnel)
Usual ejector types for this application are: