US3794137A - Device for attenuating the noise generated by the expansion of gases into the atmosphere - Google Patents

Device for attenuating the noise generated by the expansion of gases into the atmosphere Download PDF

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Publication number
US3794137A
US3794137A US00289289A US3794137DA US3794137A US 3794137 A US3794137 A US 3794137A US 00289289 A US00289289 A US 00289289A US 3794137D A US3794137D A US 3794137DA US 3794137 A US3794137 A US 3794137A
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US
United States
Prior art keywords
duct
sound
slot
inlet end
outlet end
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 - Lifetime
Application number
US00289289A
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English (en)
Inventor
C Teodorescu
C Ceauselu
G Vasilescu
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.)
INST PENTRU CREATIC STIINTIFICA SI TEHNICA RU
INST PENTRU CREATIE STINTIFIC
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INST PENTRU CREATIE STINTIFIC
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Publication of US3794137A publication Critical patent/US3794137A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N1/00—Silencing apparatus characterised by method of silencing
    • F01N1/14—Silencing apparatus characterised by method of silencing by adding air to exhaust gases
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N1/00—Silencing apparatus characterised by method of silencing
    • F01N1/08—Silencing apparatus characterised by method of silencing by reducing exhaust energy by throttling or whirling
    • F01N1/10—Silencing apparatus characterised by method of silencing by reducing exhaust energy by throttling or whirling in combination with sound-absorbing materials
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S239/00—Fluid sprinkling, spraying, and diffusing
    • Y10S239/07—Coanda

Definitions

  • ABSTRACT A device for attenuating the noise generated by the expansion into the atmosphere of the gases an industrial installation.
  • the device utilizes an exterior type Coanda the body of which has an annular cavit e'ector, [52] US. 181/33 E, 181/33 C, 181/42, y followe d by a 8 244/42 7 slot and further by an outer curving profile and a F0111 1/10, Foln 1/14, lm0 converging cone; the ejector lies in an attenuator of Search] HB, HC, HD, 43, ending in an exhaust cone 181/33 E; 244/42 CD; 239/D1G. 7
  • a converging inlet nozzle for the ejected air connected to an inlet attenuator, an inner-type Coanda ejector followed by a diffuser, an outlet attenuator and an exhaust nozzle.
  • a damping screen is disposed at an adequate distance.
  • the inner type Coanda ejector is provided with an annular cavity into which the exhaust gases flow; these gases also traverse an annular slot and adhere in form of an annular jet to the Coanda ejector wall, and bend along a neck towards the lower part of the diffuser, outlet attenuator and exhaust nozzle.
  • the elements of the damper are provided with sound-absorbing walls or surfaces.
  • This latter device is of difficult construction because of the annular laminating .chamber, and is of undesirable the a large size and weight.
  • the device according to this invention eliminates the disadvantages mentioned above in that it is composed of an outer type Coanda ejector consisting into of a support, a body formed with an annular cavity and a slot, an outer profile and a cone, the ejector being placed inside an active attenuator, composed of two sections fastened to one another and having the inner walls lined with sound-absorbing material, the attenuator being continued by a widening exhaust nozzle.
  • the gases which are to be vented into the atmosphere are supplied by a pipe with sound-absorbing material-lined walls upon the same distance as the lower section of the active structure attenuator.
  • the gases entering the nozzle annular cavity traverse the slot as a thin annular jet adhering to and bending to conform to the outer profile wall and the cone of the nozzle, causing a violent induction of the ambient air from an upstream location proximal to a damping screen provided by the gradual increase of the cross section of the discharge nozzle.
  • FIGURE of the drawing is a longitudinal section through the drawing showing a longitudinal section of the device.
  • the device according to this invention is composed of an outer profile upwardly tapered Coanda ejector 1, an active tubular attenuator formed by two axially aligned continuous sections 2 and 3, an upwardly frustoconically divergent exhaust nozzle 4, a damping screen 5 at the lower intake end, which functions to limit the propagation of noise and fonns part of a support 6 of the device.
  • the Coanda ejector 1 is formed by a central support 7, a body 8 provided at the outside with an outwardly upwardly bulging Coanda profile 9 and a cone 10.
  • the ejector is provided with an annular cavity a, formed out of two halves, in this case the first half being realized inside the body 8 and the second half by an outer groove of the support 7.
  • the annular cavity a is continued into the slot f opening outwardly adjacent the Coanda outer profile 9.
  • the cone l0 and the upper section 3 of the active structure attenuator form a nozzle j of increasing flow section, which is extended by the exhaust nozzle 4, the shape of which is determined depending upon the geometrical characteristics of the ejector and the parameters of the expanding gas.
  • the attenuator formed by the sections 2 and 3 have a sound-absorbing coating.
  • the device For supplying the fluid to be exhausted, the device is provided with a pipe 11 adequately acoustically treated (i.e., surrounded by acoustic insulation) over the length thereof within the section 2 of the active attenuator, the pipe 11 forming with the ejector 1 the central part of the device.
  • a pipe 11 adequately acoustically treated (i.e., surrounded by acoustic insulation) over the length thereof within the section 2 of the active attenuator, the pipe 11 forming with the ejector 1 the central part of the device.
  • the gas expansion noise attenuating device works in the following way:
  • the thin annular gas jet adheres to the wall 9 of the exterior type Coanda nozzle, bending therealong and generating a violent induction of the upstream air (arrow above screen 5).
  • the flowing of the gas through the circular slot f causes the structural modification of the noise created by the jet, by moving the acoustic spectrum into the domain of the high and of the very high frequencies, in simultaneously modifying the directivity of the noise created by the jet by way of directing its predominant components towards the sound-absorbing layers of the sections 2 and 3 forming the active attenuator.
  • the attenuation of the jet with the frequencies thus modified is easily done by the active structure of the sections 3 and 4.
  • a device for attenuating the noise generated upon expansion of a gas into the atmosphere comprising:
  • a duct lined with sound-absorbing material having an inlet end open to the atmosphere and an outlet end opposite said inlet end;
  • a body in said duct between said ends and defining a constriction therein said body having'an outwardly bulging portion turned toward said inlet end and curving complexly toward the inner wall of said duct in the direction of said outlet end, and a tapering portion converging toward said outlet end and 1 merging with the surface of said bulging portion, said tapering portion defining with said wall of said duct a progressively increasing flow cross-section in the direction of said outlet end, and means form'- ing an annular outwardly open slot immediately adjacent said bulging portion for distributing the expandable gas onto the surfaces of said portions for Coanda flow therealong; and
  • the device defined in claim 2 further comprising an outwardly diverging discharge nozzle lined with sound-absorbing material and connected to said duct at said outlet end, and a sound-absorbing screen affixed to said duct and spaced from said inlet end thereof while extending transversely to said duct.
  • said means communicating with said slot includes a pipe extending axially through said duct between said inlet end and said slot, said device further comprising a sheath of sound-absorbing material around said pipe in said duct.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Jet Pumps And Other Pumps (AREA)
  • Soundproofing, Sound Blocking, And Sound Damping (AREA)
  • Duct Arrangements (AREA)
  • Exhaust Silencers (AREA)
US00289289A 1971-12-13 1972-09-15 Device for attenuating the noise generated by the expansion of gases into the atmosphere Expired - Lifetime US3794137A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
RO69039A RO54896A2 (fr) 1971-12-13 1971-12-13

Publications (1)

Publication Number Publication Date
US3794137A true US3794137A (en) 1974-02-26

Family

ID=20089915

Family Applications (1)

Application Number Title Priority Date Filing Date
US00289289A Expired - Lifetime US3794137A (en) 1971-12-13 1972-09-15 Device for attenuating the noise generated by the expansion of gases into the atmosphere

Country Status (12)

Country Link
US (1) US3794137A (fr)
JP (1) JPS515921B2 (fr)
CS (1) CS203048B2 (fr)
DD (1) DD101726A1 (fr)
DE (1) DE2241234B2 (fr)
FR (1) FR2165381A5 (fr)
GB (1) GB1384417A (fr)
HU (1) HU167003B (fr)
IT (1) IT967096B (fr)
RO (1) RO54896A2 (fr)
SU (1) SU505389A3 (fr)
YU (1) YU35718B (fr)

Cited By (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
USB586215I5 (fr) * 1975-06-12 1976-01-20
DE2537953A1 (de) * 1974-08-26 1976-03-11 Wright Barry Corp Duese, insbesondere hochdruckduese mit geringem geraeuschpegel
US4113048A (en) * 1975-06-12 1978-09-12 Institutul National Pentru Creatie Stiintifica Si Tehnica - Increst Method of and device for attenuating the noise radiated by gas jets
US4196793A (en) * 1975-06-12 1980-04-08 Institutul National Pentru Creatie Stiintifica Si Tehnica - Increst Method of and device for attenuating the noise radiated by gas jets
US4486167A (en) * 1980-12-10 1984-12-04 The British Petroleum Company Limited Flare having noise attenuation
US6098904A (en) * 1998-03-10 2000-08-08 Air Force 1 Blow Off Systems Inc. Nozzle for producing a high-impact long-range jet from fan-blown air
US6267199B1 (en) * 1999-10-15 2001-07-31 Sound Ware Industry Co., Ltd. Automobile exhaust tube
US20040110105A1 (en) * 2002-12-04 2004-06-10 Rajewski Robert C. Flare stack operating on coanda principle
US20040244408A1 (en) * 2003-05-28 2004-12-09 Haruyuki Nishijima Ejector cycle with insulation of ejector
US20040253116A1 (en) * 2001-05-11 2004-12-16 Grove Graham Bond Aerofoil with gas discharge
US20150139823A1 (en) * 2011-05-20 2015-05-21 Brian J. Mornan Aspirating Induction Nozzle with Flow Transition
US20150211735A1 (en) * 2012-08-16 2015-07-30 Schlumberger Technology Corporation Shrouded-coanda multiphase burner
US9599124B2 (en) 2014-04-02 2017-03-21 Cnh Industrial Canada, Ltd. Air diffuser for vacuum fan of planters
CN108591135A (zh) * 2018-06-11 2018-09-28 南华大学 锥形空气诱导器
BE1025863B1 (nl) * 2017-12-29 2019-07-31 Europem Technologies Nv Vlamafscherminrichting voor een brander
WO2020051623A1 (fr) * 2018-09-13 2020-03-19 The University Of Adelaide Ensemble pour gaz d'échappement

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2314555A1 (fr) * 1975-06-12 1977-01-07 Inst Pentru Creatie Stintific Procede et dispositif pour l'amortissement du bruit produit par les jets de gaz
GB2139696A (en) * 1983-05-11 1984-11-14 Industry The Secretary Of Stat Absorptive exhaust gas silencer
FR2589195B1 (fr) * 1985-10-25 1989-07-28 Vibrasonic Cheminee insonorisee pour gaz chauds ejectes d'un tube d'echappement
GB2233037B (en) * 1988-11-26 1993-08-11 James David Coleman Combustion engines
GB2252128A (en) * 1991-01-24 1992-07-29 S & C Thermofluids Ltd Providing intercooler air coolant flow in turbocharged engines.
DE202013003460U1 (de) 2013-04-12 2014-07-14 Liebherr-Werk Bischofshofen Gmbh Schalldämpfer
JP6802082B2 (ja) * 2017-02-17 2020-12-16 ホシザキ株式会社 蒸気発生装置
DE102020005852A1 (de) * 2019-10-25 2021-04-29 Rs Rittel Gmbh Düse zum Verdüsen eines Fluids und Verbrennungsanlage

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3027714A (en) * 1959-06-11 1962-04-03 Canadair Ltd Combined thrust reversing and noise suppressing device for turbo-jet engines
US3349868A (en) * 1963-11-08 1967-10-31 Gruenzweig & Hartmann Sound suppressors particularly for jet engines
US3386528A (en) * 1964-01-04 1968-06-04 Gruenzweig & Hartmann Jet engine sound suppressor with coanda effect deflector
US3685614A (en) * 1970-10-26 1972-08-22 Inst Pentru Creatre Stiintific Method and device for attenuating the noise generated by the expansion of gases into the atmosphere

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3027714A (en) * 1959-06-11 1962-04-03 Canadair Ltd Combined thrust reversing and noise suppressing device for turbo-jet engines
US3349868A (en) * 1963-11-08 1967-10-31 Gruenzweig & Hartmann Sound suppressors particularly for jet engines
US3386528A (en) * 1964-01-04 1968-06-04 Gruenzweig & Hartmann Jet engine sound suppressor with coanda effect deflector
US3685614A (en) * 1970-10-26 1972-08-22 Inst Pentru Creatre Stiintific Method and device for attenuating the noise generated by the expansion of gases into the atmosphere

Cited By (23)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2537953A1 (de) * 1974-08-26 1976-03-11 Wright Barry Corp Duese, insbesondere hochdruckduese mit geringem geraeuschpegel
US3984054A (en) * 1974-08-26 1976-10-05 Barry Wright Corporation Nozzle
USB586215I5 (fr) * 1975-06-12 1976-01-20
US3985302A (en) * 1975-06-12 1976-10-12 Barry Wright Corporation Variable two stage air nozzle
US4113048A (en) * 1975-06-12 1978-09-12 Institutul National Pentru Creatie Stiintifica Si Tehnica - Increst Method of and device for attenuating the noise radiated by gas jets
US4196793A (en) * 1975-06-12 1980-04-08 Institutul National Pentru Creatie Stiintifica Si Tehnica - Increst Method of and device for attenuating the noise radiated by gas jets
US4486167A (en) * 1980-12-10 1984-12-04 The British Petroleum Company Limited Flare having noise attenuation
US6098904A (en) * 1998-03-10 2000-08-08 Air Force 1 Blow Off Systems Inc. Nozzle for producing a high-impact long-range jet from fan-blown air
US6267199B1 (en) * 1999-10-15 2001-07-31 Sound Ware Industry Co., Ltd. Automobile exhaust tube
US7461820B2 (en) * 2001-05-11 2008-12-09 Graham Bond Grove Aerofoil arrangement
US20040253116A1 (en) * 2001-05-11 2004-12-16 Grove Graham Bond Aerofoil with gas discharge
US20040110105A1 (en) * 2002-12-04 2004-06-10 Rajewski Robert C. Flare stack operating on coanda principle
US6960075B2 (en) 2002-12-04 2005-11-01 Rajewski Robert C Flare stack operating on Coanda principle
US20040244408A1 (en) * 2003-05-28 2004-12-09 Haruyuki Nishijima Ejector cycle with insulation of ejector
US6978637B2 (en) * 2003-05-28 2005-12-27 Denso Corporation Ejector cycle with insulation of ejector
US20150139823A1 (en) * 2011-05-20 2015-05-21 Brian J. Mornan Aspirating Induction Nozzle with Flow Transition
US9897111B2 (en) * 2011-05-20 2018-02-20 Dyna-Tech Sales Corporation Aspirating induction nozzle with flow transition
US20150211735A1 (en) * 2012-08-16 2015-07-30 Schlumberger Technology Corporation Shrouded-coanda multiphase burner
US9599124B2 (en) 2014-04-02 2017-03-21 Cnh Industrial Canada, Ltd. Air diffuser for vacuum fan of planters
BE1025863B1 (nl) * 2017-12-29 2019-07-31 Europem Technologies Nv Vlamafscherminrichting voor een brander
CN108591135A (zh) * 2018-06-11 2018-09-28 南华大学 锥形空气诱导器
WO2020051623A1 (fr) * 2018-09-13 2020-03-19 The University Of Adelaide Ensemble pour gaz d'échappement
EP3850197A4 (fr) * 2018-09-13 2022-04-06 The University of Adelaide Ensemble pour gaz d'échappement

Also Published As

Publication number Publication date
DE2241234B2 (de) 1974-08-01
DE2241234C3 (fr) 1975-04-03
YU35718B (en) 1981-06-30
DE2241234A1 (de) 1973-06-28
JPS4866802A (fr) 1973-09-13
GB1384417A (en) 1975-02-19
CS203048B2 (en) 1981-02-27
RO54896A2 (fr) 1973-09-20
HU167003B (fr) 1975-07-28
YU223272A (en) 1980-10-31
DD101726A1 (fr) 1973-11-12
FR2165381A5 (fr) 1973-08-03
JPS515921B2 (fr) 1976-02-24
IT967096B (it) 1974-02-28
SU505389A3 (ru) 1976-02-28

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