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Патент USA US2404767

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July 23, 1946-
F. A. M. HEPPNER
2,404,767
JET PROPULSION PLANT
Filed April 28, 1943
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Patented July 23, i946
2,404,767
UNITED.’ STATES PATENT OFFICE
2,404,767
JET PROPULSION mm.‘
‘ Fritz Albert Max Heppner, Leamington
Spa, Eng
land. ,assignor to Armstrong Siddeley Motors
Limited, Coventry, Englan d
1
.
‘ .
Application April 28, 1943, Serial No. 484,917
In Great Britain October 28, 1941
2 Claims. (01. 60-356)
2
This invention relates to a jet-propulsion, in
.
. ternal casing l5 carrying brackets l1 and II fast
with the ‘ends of the casing l5 and serving to
use in an aircraft, of the kind having counter
rotatable parts, namely, inner rotors carrying . journal the inner ‘rotor ll carrying the air-‘screw
blades I2. Journalled on the rotor at is, 2| is a
some at least of the compressor and of the tur
shell l3 carrying contra-rotating air-screw blades
bine blades, and an outer turbine shell carrying
it within the casing l5. 2| represents counter
some at least oi’ the turbine blades. Preferably
rotating compressor blades and 22 counter-rotat
the compressor and turbine are of the
ing turbine blades. 23 and 24 are brackets sup
type.
'
porting the ends 0! the shell I3 from the bear
According to the invention, the counter-rotat
ings I9 and 20. In this embodiment the air from
ins outer turbine shell carries external air-screw
the air-screw blades l4 mixes with the turbine
blades.
~
‘exhaust to constitute a propulsion Jet.
_
A further feature of the invention consists in
Each of the brackets 23, 24 is a spider having
the air dealt with by the air-screw blades being
an inner hub .26 and arms 21 connecting the hub
passed into the jet-tor example, the plant'may
to the shell l3, air passing between the arms 21
have a stationary casing enclosing some at least
of the bracket ‘23 to'enter the compressor, and
of the‘ air-screw blades and directing the air
the turbine exhaust passing betweenv the arms 27
passed thereby into the jet.
of the bracket 24.
The main purpose of the invention is to drive
a similar way, each of the brackets II, II is
the rotatable air-screw blades at slow speed so 20 a In
as to keep the speed 01' the air relatively to the " ' spider having an ‘inner hub 29 and arms ll.
between which air can pass, connecting the hubs
blades well below sound speed but at the same
with the casing l5.
'
time to derive the power from a counter-rotating
3|
indicates
a
fuel
supply
means
for
the
air
turbine which works under high relative speed.
ternal-combustion, turbine plant, particularly for
is
This arrangement provides the e?ect of a gear
between the turbine and the rotatable air-screw
blades, without the complication of a mechanical
8681‘.
.
7
.
Figure 1 is an elevation showing a simple ar
rangement according to the invention, with the
stationary external casing or cowl omitted; and
Figure 2 is a similar view, but with the cowl
showninsection.
In the construction shown by Figure 1, ll rep
resents an inner rotor of
In this way the jet-propulsion oi the plant
itself is increased by the external air being di
rected into the jet.
, .
_
I
In the accompanylnssheet o1’ diagrammatic
drawings;
leaving the compressor and entering the turbine.
the plant having
mounted upon it air-screw
l2,; and I3
represents the outer turbine blades
shell of the plant
having mounted upon it ‘external air-screw
What I claim as my invention and desire to
secure by Letters Patent of the United States is:
80 ‘ 1. A jet-propulsion, internal-combustion tur
blne plant of the axial-?ow type including a
rotor, compressor an ' turbine blades carried
thereby, a counter-rotating turbine shell radially
outside of and enclosing1 said turbine blades, ad- '
35 ditional turbine blades carried by said shell in
ternally, said shell having an outlet to provide a
Jet, external air-screw blades also carried by said
shell. and astationary casing enclosing‘ said air
screw blades and 'having an outlet communicat
40 ing with said ?rst named outlet whereby the air
dealt with by the air-screw blades'Joins the tutbine exhaust to constitute the propulsion Jet.
blades It. The inner rotor ll carries some of
the compressor blades and. also some oi’ the blades
of the turbine, and in like mannerv the outer
2. A Jet-propulsion, internal-combustion turshell ,I'I carries some or the blades of the tur
bine
plant of the axial-?ow type having an inner
bine. The plant may be of the kind disclosed 45
turbine rotor and a counter-rotating outer tur
in U. 8. Patent No. 2,360,130. The inner rotor
bine shell, said shell having an outlet to provide
H and outer shell II rotate in opposite direc
a jet, external air-screw blades carried on said.
tions and the provision oi the ‘counter-rotating
shell, and a stationary casing enclosing said air
air-screw blades renders the plant suitable for
use at lower speeds than it Jet-propulsion alone 50 screw. blades and having an outlet communicat
ing with the outlet 01' said shell for directing the
were relied upon, due to the fact that a higher
expansion takes place in the ‘turbine, so that
the ?nal iet speed is decreased.
-_
In the construction of Fig. 2 there is an“!!!
air passed thereby to Join the turbine exhaust
and constitute the propulsion iet.
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