GB766986A - Noise suppressing nozzles for aircraft jet propulsion engines - Google Patents

Noise suppressing nozzles for aircraft jet propulsion engines

Info

Publication number
GB766986A
GB766986A GB1912355A GB1912355A GB766986A GB 766986 A GB766986 A GB 766986A GB 1912355 A GB1912355 A GB 1912355A GB 1912355 A GB1912355 A GB 1912355A GB 766986 A GB766986 A GB 766986A
Authority
GB
Grant status
Application
Patent type
Prior art keywords
nozzle
projections
jet
shown
exit
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
GB1912355A
Original Assignee
Geoffrey Michael Lilley
Robert Westley
Alec David Young
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date

Links

Classifications

    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02KJET-PROPULSION PLANTS
    • F02K1/00Plants characterised by the form or arrangement of the jet pipe or nozzle; Jet pipes or nozzles peculiar thereto
    • F02K1/46Nozzles having means for adding air to the jet or for augmenting the mixing region between the jet and the ambient air, e.g. for silencing
    • F02K1/48Corrugated nozzles
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02KJET-PROPULSION PLANTS
    • F02K1/00Plants characterised by the form or arrangement of the jet pipe or nozzle; Jet pipes or nozzles peculiar thereto
    • F02K1/46Nozzles having means for adding air to the jet or for augmenting the mixing region between the jet and the ambient air, e.g. for silencing

Abstract

766,986. Exhaust-silencers. LILLEY, G. M., WESTLEY, R. and YOUNG, A. D. July 21, 1953 [July 25, 1952], No. 19123/55. Divided out of 766,985. Class 7 (2). [Also in Group XXVI] are positioned on the upstream side of the ring (c) two diametrically opposite projections 4, Fig. 14, which extend inwardly toward the axis of the jet are arranged on the variable area nozzle 1, and " eyelid " shutters 26 pivoted in bearings 28 are provided with inwardly inclined projections 27, (d), Fig. 15 (not shown), a device for attaching to a jet pipe comprises a split ring having projections, some of which are inwardly inclined. In another modification, Fig. 17, a number of projections 30 are pivoted about their mid-points on a ring 31 supported independently of the jet nozzle 1, and alternate projections are connected to controlling mechanisms 33, 34 movable to the right or left as seen in the figure so that the respective projections 30 are caused to become inclined towards or away from the axis of the jet ; alternatively, all the projections have their downstream ends inclined inwardly towards the axis of the jet. In other modifications, (a) Fig. 18 (not shown), a number of apertures around the perimeter of the convergent part of the nozzle allow the boundary layer of the jet to escape and mix with the atmosphere, a variable exit area being achieved by slidable closing elements preferably mounted on the inside wall of a nacelle surrounding the jet pipe, (b), Fig. 19 (not shown), the boundary layer of the jet passes outwardly through a finely perforated or gauze wall over which slides an obturator element. In still further modifications, (a), Fig. 20 (not shown), a supersonic nozzle of convergentdivergent construction has an exit equipped with projections of the kind shown in Fig. 1, (b), Fig. 21 (not shown), the convergent portion of a nozzle protrudes into a divergent extension piece, a gap being left between the perimeter of the nozzle exit and the wall of the extension piece and in the plane of the exit, and (c), the extension piece 45, Fig. 22, has a 'double wall, the inner wall 48 being perforated and the space between the walls being filled with sound-insulating material; projections 4 are provided at the edge 47 of the piece 45 or the nozzle exit 3, or both. The silencing means may be applied to aircraft rocket, ramjet or gas turbine engines, propulsive jets for vehicles or ships, and steam and air jets. According to the Provisional Specification, the projections may be angularly adjustable or retractable, or both, and used as a device for altering the jet exit area. Also, the projections may have combined axial and angular movement under the control of electric, hydraulic or pneumatic actuators. A noise suppressing nozzle for the gas stream of an aircraft jet-propulsion engine is of fixed configuration, shaped at the upstream end 2 thereof in the same manner as the jet pipe 1, and peripherally corrugated. The corrugations continuously deepen in the downstream direction and up to the plane of the nozzle exit. As shown, there are six complete corrugations, the crests 3 and troughs 4 of which are respectively inclined away from and towards the axis of the nozzle ; the total depth of a single corrugation at the downstream end of the nozzle is of the same order as the radius of the jet pipe, and of the upstream end of the nozzle. The nozzle may be fabricated integrally with the jet pipe.
GB1912355A 1952-07-25 1952-07-25 Noise suppressing nozzles for aircraft jet propulsion engines Expired GB766986A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
GB1912355A GB766986A (en) 1952-07-25 1952-07-25 Noise suppressing nozzles for aircraft jet propulsion engines
GB1891152A GB766985A (en) 1952-07-25 1952-07-25 Improvements in or relating to jet noise suppression means

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB1912355A GB766986A (en) 1952-07-25 1952-07-25 Noise suppressing nozzles for aircraft jet propulsion engines

Publications (1)

Publication Number Publication Date
GB766986A true true GB766986A (en) 1957-01-30

Family

ID=26253683

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1912355A Expired GB766986A (en) 1952-07-25 1952-07-25 Noise suppressing nozzles for aircraft jet propulsion engines

Country Status (1)

Country Link
GB (1) GB766986A (en)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2978061A (en) * 1956-03-16 1961-04-04 Rolls Royce Jet propulsion nozzles
DE1125234B (en) * 1957-08-20 1962-03-08 United Aircraft Corp The device for suppressing Duesenlaerm
US3027714A (en) * 1959-06-11 1962-04-03 Canadair Ltd Combined thrust reversing and noise suppressing device for turbo-jet engines
US3084505A (en) * 1960-05-03 1963-04-09 Robert A Cherchi Exhaust duct for turbo-jet engine
US3092205A (en) * 1957-09-02 1963-06-04 Rolls Royce Jet noise suppressor nozzle
US3153319A (en) * 1952-07-25 1964-10-20 Young Alec David Jet noise suppression means
GB2209054B (en) * 1987-08-26 1992-04-15 Rolls Royce Plc Gas turbine nozzles
EP1894616A1 (en) * 2006-08-30 2008-03-05 Fachhochschule Zentralschweiz Static mixing device

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3153319A (en) * 1952-07-25 1964-10-20 Young Alec David Jet noise suppression means
US2978061A (en) * 1956-03-16 1961-04-04 Rolls Royce Jet propulsion nozzles
DE1125234B (en) * 1957-08-20 1962-03-08 United Aircraft Corp The device for suppressing Duesenlaerm
US3092205A (en) * 1957-09-02 1963-06-04 Rolls Royce Jet noise suppressor nozzle
US3027714A (en) * 1959-06-11 1962-04-03 Canadair Ltd Combined thrust reversing and noise suppressing device for turbo-jet engines
US3084505A (en) * 1960-05-03 1963-04-09 Robert A Cherchi Exhaust duct for turbo-jet engine
GB2209054B (en) * 1987-08-26 1992-04-15 Rolls Royce Plc Gas turbine nozzles
EP1894616A1 (en) * 2006-08-30 2008-03-05 Fachhochschule Zentralschweiz Static mixing device
WO2008025178A1 (en) * 2006-08-30 2008-03-06 Fachhochschule Zentralschweiz Static mixing device

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