GB867808A - Improvements in or relating to silencers for jet propulsion units - Google Patents

Improvements in or relating to silencers for jet propulsion units

Info

Publication number
GB867808A
GB867808A GB34747/57A GB3474757A GB867808A GB 867808 A GB867808 A GB 867808A GB 34747/57 A GB34747/57 A GB 34747/57A GB 3474757 A GB3474757 A GB 3474757A GB 867808 A GB867808 A GB 867808A
Authority
GB
United Kingdom
Prior art keywords
duct
wall
sound
gas
silencers
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
GB34747/57A
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
WERNER GENEST GES fur ISOLIERU
Original Assignee
WERNER GENEST GES fur ISOLIERU
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
Application filed by WERNER GENEST GES fur ISOLIERU filed Critical WERNER GENEST GES fur ISOLIERU
Publication of GB867808A publication Critical patent/GB867808A/en
Expired legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B64—AIRCRAFT; AVIATION; COSMONAUTICS
    • B64F—GROUND OR AIRCRAFT-CARRIER-DECK INSTALLATIONS SPECIALLY ADAPTED FOR USE IN CONNECTION WITH AIRCRAFT; DESIGNING, MANUFACTURING, ASSEMBLING, CLEANING, MAINTAINING OR REPAIRING AIRCRAFT, NOT OTHERWISE PROVIDED FOR; HANDLING, TRANSPORTING, TESTING OR INSPECTING AIRCRAFT COMPONENTS, NOT OTHERWISE PROVIDED FOR
    • B64F1/00—Ground or aircraft-carrier-deck installations
    • B64F1/26—Ground or aircraft-carrier-deck installations for reducing engine or jet noise; Protecting airports from jet erosion

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Aviation & Aerospace Engineering (AREA)
  • Exhaust Silencers (AREA)

Abstract

867,808. Exhaust-silencers. WERNER GENEST GESELLSCHAFT FUR ISOLIERUNGEN. Nov. 7, 1957 [Nov. 8,1956], No. 34747/57. Class 7(2). A conical duct 2, Fig. 2, for ground muffling of a jet engine 1 has a perforated wall 3 backed by transverse partitions 6 partially delimiting chambers so packed with sound-insulating material as respectively to damp out sounds of different frequencies by giving acoustical wall impedances (ratios of the sound pressure on the material surface to the velocity normal to the wall of the air or gas particles in the sound field) in substantial accordance with the quantity 2apf (0.90-i0.38) where a is the corresponding duct radius, p is the density of the gas at the duct entry, f is the respective sound frequency and i is #-1. The material preferably has an optimum specific flow resistance substantially equal to the quantity 0.4pc (2a)/L<SP>2</SP> where p is the density of the gas adjacent the wall, c is the corresponding jet velocity, L is the chamber depth and a is the duct radius as before. The duct 2 may be coaxial with a cylindrical sheet metal casing 4, or eccentric therewith as shown in Fig. 8, the sheet metal wall 3 being supported in each case by longitudinal members 5 further delimiting the chambers, which may be filled with soundinsulating material, or have various walls lined or sprayed over with sheets, e.g. 9 or 10, thereof. Wire screens 11 of up to 8 cm. inter-wire spacing, are provided; they may have their meshes relatively offset or differently orientated and need not be at right angles to the duct axis.
GB34747/57A 1956-11-08 1957-11-07 Improvements in or relating to silencers for jet propulsion units Expired GB867808A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE867808X 1956-11-08

Publications (1)

Publication Number Publication Date
GB867808A true GB867808A (en) 1961-05-10

Family

ID=6802213

Family Applications (1)

Application Number Title Priority Date Filing Date
GB34747/57A Expired GB867808A (en) 1956-11-08 1957-11-07 Improvements in or relating to silencers for jet propulsion units

Country Status (1)

Country Link
GB (1) GB867808A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2001135A (en) * 1977-07-13 1979-01-24 Carrier Corp Pressure variation absorber

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2001135A (en) * 1977-07-13 1979-01-24 Carrier Corp Pressure variation absorber
GB2001135B (en) * 1977-07-13 1982-01-27 Carrier Corp Pressure variation absorber

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