WO2012075844A1 - Silencieux - Google Patents

Silencieux Download PDF

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Publication number
WO2012075844A1
WO2012075844A1 PCT/CN2011/079641 CN2011079641W WO2012075844A1 WO 2012075844 A1 WO2012075844 A1 WO 2012075844A1 CN 2011079641 W CN2011079641 W CN 2011079641W WO 2012075844 A1 WO2012075844 A1 WO 2012075844A1
Authority
WO
WIPO (PCT)
Prior art keywords
housing
exhaust pipe
muffler
casing
end part
Prior art date
Application number
PCT/CN2011/079641
Other languages
English (en)
Chinese (zh)
Inventor
孙新波
Original Assignee
中国商用飞机有限责任公司
中国商用飞机有限责任公司上海飞机设计研究院
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 中国商用飞机有限责任公司, 中国商用飞机有限责任公司上海飞机设计研究院 filed Critical 中国商用飞机有限责任公司
Publication of WO2012075844A1 publication Critical patent/WO2012075844A1/fr

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
    • F01D25/00—Component parts, details, or accessories, not provided for in, or of interest apart from, other groups
    • F01D25/30—Exhaust heads, chambers, or the like
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02C—GAS-TURBINE PLANTS; AIR INTAKES FOR JET-PROPULSION PLANTS; CONTROLLING FUEL SUPPLY IN AIR-BREATHING JET-PROPULSION PLANTS
    • F02C7/00—Features, components parts, details or accessories, not provided for in, or of interest apart form groups F02C1/00 - F02C6/00; Air intakes for jet-propulsion plants
    • F02C7/24—Heat or noise insulation
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02K—JET-PROPULSION PLANTS
    • F02K1/00—Plants characterised by the form or arrangement of the jet pipe or nozzle; Jet pipes or nozzles peculiar thereto
    • F02K1/46—Nozzles 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02K—JET-PROPULSION PLANTS
    • F02K1/00—Plants characterised by the form or arrangement of the jet pipe or nozzle; Jet pipes or nozzles peculiar thereto
    • F02K1/78—Other construction of jet pipes
    • F02K1/82—Jet pipe walls, e.g. liners
    • F02K1/827—Sound absorbing structures or liners
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05D—INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
    • F05D2250/00—Geometry
    • F05D2250/20—Three-dimensional
    • F05D2250/23—Three-dimensional prismatic
    • F05D2250/232—Three-dimensional prismatic conical
    • 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
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T50/00—Aeronautics or air transport
    • Y02T50/60—Efficient propulsion technologies, e.g. for aircraft

Definitions

  • the present invention relates to a muffler, and more particularly to a muffler for use in an exhaust system of an auxiliary power unit in an aircraft. Background technique
  • an auxiliary power unit In the aircraft, an auxiliary power unit (APU) is located at the rear of the aircraft's body, and a firewall isolates the auxiliary power unit from the aircraft's tail cone.
  • the exhaust noise of the auxiliary power unit (APU) can be led to the integrated tail cone muffler via the exhaust pipe, and the exhaust noise of the auxiliary power unit is reduced by the muffler.
  • the muffler includes a housing, an exhaust pipe, and an inner chamber, the housing having a first end, a second end, and a tapered wall portion that gradually decreases in cross section from the first end to the second end;
  • the exhaust pipe has an intake port corresponding to the first end of the casing and an exhaust port corresponding to the second end of the casing;
  • the internal chamber is formed on an inner surface of the casing And an outer surface of the exhaust pipe; wherein an intake port of the exhaust pipe extends beyond a first end of the housing and a first end of the housing and an exhaust pipe Phase sealed, the second end of the housing has an opening, the exhaust port of the exhaust pipe is in the inner chamber and has a gap between the opening of the second end of the housing,
  • a venting opening is also provided on the tapered wall portion of the housing through which ambient air enters the interior chamber and is discharged from the opening of the second end of the housing.
  • the vent has a sound insulating element.
  • the sound insulating element is a phononic crystal.
  • the vent is located on an upper surface of the tapered wall portion of the housing.
  • the second end of the housing has a Rabbin-shaped emission enhancement portion that tapers in a flow direction of the gas to thereby illuminate the air of the internal chamber out of the emission enhancement portion. .
  • the exhaust pipe has a plurality of holes communicating with the internal chamber.
  • the exhaust pipe is made of a porous material.
  • the conical wall portion of the housing further has a drain ⁇ communicating with the inner chamber.
  • the first end of the liquid discharge opening adjacent to the housing is located at a lowest point of a cross section of the tapered wall portion of the housing.
  • the outside air can enter the internal chamber to cool the muffler, so that the working temperature of the muffler is reduced to a certain extent, and the working environment inside the muffler is greatly improved.
  • the material selection of the muffler is made. The face has also widened.
  • FIG. 1 is a schematic view of a muffler in the prior art.
  • FIG. 2 is a schematic illustration of a muffler in the present invention. detailed description
  • the improved muffler 10 includes a housing 1 1 and an exhaust pipe 12. Said The housing 1 1 has a first end portion 13a having a large sectional area and a second end portion 13b having a small sectional area, and a tapered wall portion 14 is formed in a direction along the horizontal axis 20. The tapered wall portion 14 may be relatively divided into an upper surface and a lower surface along a horizontal axial section.
  • the exhaust pipe 12 has an intake port 15a and an exhaust port 15b, and the intake port 15a is provided corresponding to the first end portion 13a of the casing 11 and is connected to the exhaust gas of the engine in the auxiliary power unit.
  • the exhaust port 15b is provided corresponding to the second end portion 13b of the housing 11 for exhausting exhaust gas from the engine to the aircraft.
  • the exhaust pipe 12 is sealed with the first end portion 13a of the casing 1 1 and the exhaust pipe 12 extends beyond the first end portion 13a of the casing 1 1 , the casing
  • the second end 13b of the body 1 1 has an opening 16.
  • an internal chamber 17 is formed between the inner surface of the casing 1 1 and the outer surface of the exhaust pipe 12.
  • the exhaust port 15b of the exhaust pipe 12 is in the inner chamber and has a gap with the opening 16 of the second end portion 13b.
  • a vent 18 is also provided on the tapered wall portion 14 of the housing 11.
  • the periphery of the opening 16 is further provided with a flared portion 22 having a bell mouth shape which gradually becomes smaller in the flow direction of the air flow, and more preferably, the radiation enhancement portion 22 and the exhaust pipe 12 are
  • the exhaust port 15b is disposed adjacent to each other such that the air of the internal chamber 17 is ejected out of the radiation enhancement portion 22, and the specific ejection principle will be described in detail later.
  • a plurality of holes 21 communicating with the internal chamber 17 may be provided on the exhaust pipe 12 to form the resonant cavity of the exhaust pipe 12 and the internal chamber 17 for reducing noise.
  • the exhaust pipe 12 can also be made of a porous material to achieve this effect.
  • the venting opening 18 also has a sound-damping element by means of which the noise discharged via the venting opening 18 can be minimized.
  • the sound insulating element may be a phononic crystal. Below, for the sake of understanding, it is necessary to make some simple introductions to the phononic crystal.
  • phononic crystals The concept of phononic crystals is derived from the concept of traditional crystals and photonic crystals. It is similar to traditional crystals and photonic crystals in that it simulates the arrangement of natural crystal atoms and has a certain periodic structure.
  • a material constituting a phononic crystal is referred to as a component, which is divided into a scatterer and a matrix. According to the shape of the scatterer and its periodic distribution in the matrix, it can be divided into one-dimensional, two-dimensional and three-dimensional phononic crystals.
  • the scatterer is plate-shaped, the two-dimensional structure is a columnar scatterer, and the three-dimensional phononic crystal scatterer is mostly a sphere; according to the material properties of the component, it can be divided into solid/solid (prescribed that the former is a scatterer, and the latter is a matrix) ), solid / liquid, liquid / solid, liquid / liquid and other combined structure.
  • the essential feature of phononic crystals is the phonon forbidden band, that is, vibration or sound waves in the range of the acoustic band gap are prohibited from propagating in the phononic crystal.
  • the generation of the phonon forbidden band and the size of the forbidden band width are mainly affected by the following factors: physical parameters such as the density of the components of the material and the ratio of the elastic parameters, the topological structure of the crystal, ie, the periodic arrangement, the scatterer geometry, and the crystal Structural parameters such as lattice constants and scatterer fill rates.
  • the forbidden band characteristics, local characteristics and focusing characteristics of phononic crystals make it potentially promising in vibration damping, noise reduction and acoustic devices. For example, it can design and manufacture a sound insulation material according to the forbidden band characteristics of the phononic crystal.
  • Noise reduction is the basic function of phononic crystal composites. This material can both isolate noise during noise propagation and control noise at the noise source.
  • the vibration isolation function is of great significance in reducing the negative effects of various vibrations and the vibration of the positioning device.
  • the phononic crystal has the locality, negative refraction, and acoustic focusing characteristics of the acoustic wave.
  • the forbidden band action of the phononic crystal is applied, so that the frequency band in which the frequency band contributes a large amount to the sound pressure level can be filtered out.
  • the application of phononic crystals to design specific sound insulation structures can be set by referring to the specific contents disclosed in Chinese patent application CN201010178681.2 or CN200810301613.3, and can also be applied to the paper.
  • the vent 18 in order to control the operating noise of the muffler 10, when the muffler 10 is mounted on an aircraft, the vent 18 is provided in the cone The upper surface of the wall portion 14, such that when the aircraft is flying, the noise emitted by the muffler through the vent 18 is diffracted toward the upper air rather than toward the ground, thereby achieving a better noise reduction effect, and more preferably, the vent 18 It is disposed away from the first end portion 13a so that the noise discharged through the vent is as close as possible to the working area of the aircraft.
  • the muffler 10 is further provided with a liquid discharge port 19. More preferably, the liquid discharge port 19 is adjacent to the first end portion 13a of the casing 1 1 and is disposed at the lowest point of the cross section of the tapered wall portion 14 of the casing 1 1 .
  • the liquid discharge port 19 is adjacent to the first end portion 13a of the casing 1 1 and is disposed at the lowest point of the cross section of the tapered wall portion 14 of the casing 1 1 .
  • the bell mouth is provided in particular around the opening 16 of the casing 11.
  • the ejector augmenting portion 22 therefore, when the flow rate of the exhaust gas in the exhaust pipe 12 is high, a low pressure region is formed at the expansion portion so that there is a pressure difference between the vent 18 and the exhaust port 15b. Therefore, outside air enters the venting port 18 into the internal chamber 17 of the muffler 10 and flows out from the opening 16 in the low pressure region, i.e., here corresponds to the configuration in which the ejector is employed.
  • a muffler having such a structure can expand the selection range of the material of the muffler on the one hand, and arrange the strobe lamp of the illumination and the cable of the navigation lamp in the muffler on the other hand.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Exhaust Silencers (AREA)

Abstract

L'invention concerne un silencieux (10) comprenant une enveloppe (11), un tuyau d'échappement (12) et une chambre (17). L'enveloppe (11) comporte une première partie terminale (13a), une seconde partie terminale (13b) et une partie de paroi (14) conique; le tuyau d'échappement (12) comporte une entrée d'air (15a) correspondant à la première partie terminale (13a) et une sortie d'échappement (15b) correspondant à la seconde partie terminale (13b). La chambre (17) est formée entre la surface intérieure de l'enveloppe (11) et la surface extérieure du tuyau d'échappement (12). Le tuyau d'échappement (12) s'étend au delà de la première partie terminale (13a) de l'enveloppe (11) et est assemblé hermétiquement à ladite première partie terminale (13a). La seconde partie terminale (13b) de l'enveloppe (11) comporte une ouverture (16). La sortie d'échappement (15b) du tuyau d'échappement (12) est disposée à l'intérieur de la chambre (17) et un espace est aménagé entre la sortie d'échappement (15b) et l'ouverture (16) de la seconde partie terminale (13b). La partie de paroi (14) conique de l'enveloppe (11) a une prise d'air (18) aménagée à sa surface. Quand le tuyau d'échappement (12) dégage des gaz de fumée, l'air extérieur entre dans la chambre (17) par la prise d'air (18) et sort par l'ouverture (16) de la seconde partie terminale (13b) de l'enveloppe (11) et de ce fait refroidit le silencieux (10). Comme un refroidissement par ventilation est rendu possible, la température de fonctionnement du silencieux est abaissée et la gamme des choix pour les matières de fabrication du silencieux s'en trouve élargie.
PCT/CN2011/079641 2010-12-08 2011-09-14 Silencieux WO2012075844A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CN201010579705.5 2010-12-08
CN2010105797055A CN102022222B (zh) 2010-12-08 2010-12-08 消声器

Publications (1)

Publication Number Publication Date
WO2012075844A1 true WO2012075844A1 (fr) 2012-06-14

Family

ID=43863912

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/CN2011/079641 WO2012075844A1 (fr) 2010-12-08 2011-09-14 Silencieux

Country Status (2)

Country Link
CN (1) CN102022222B (fr)
WO (1) WO2012075844A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9145801B2 (en) 2013-07-01 2015-09-29 The Boeing Company Systems and methods for acoustic resonance mitigation

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102022222B (zh) * 2010-12-08 2013-05-29 中国商用飞机有限责任公司 消声器
CN104179879B (zh) * 2014-07-29 2016-05-18 哈尔滨工业大学 一种圆形套筒式声子晶体隔振器
CN105350403B (zh) * 2015-09-30 2017-11-10 同济大学 具有周期性结构特征的轨道板及轨道板减振系统
US20180298826A1 (en) * 2017-04-18 2018-10-18 Itt Manufacturing Enterprises Llc Aircraft auxiliary power unit exhaust pipe seals and methods
CN107893778B (zh) * 2017-10-16 2020-02-11 中国商用飞机有限责任公司 一种风扇进气入口装置
US10967983B2 (en) * 2019-06-05 2021-04-06 Pratt & Whitney Canada Corp. Aircraft power plant

Citations (5)

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WO1991008379A1 (fr) * 1989-11-28 1991-06-13 Allied-Signal Inc. Silencieux pour reacteur a double flux
US20050077104A1 (en) * 2003-10-14 2005-04-14 Flintham Stuart A. Serviceable muffler
US20060059674A1 (en) * 2004-09-23 2006-03-23 Williams Nicholas A Procedure for replacement of acoustic liner in integrated exhaust duct muffler for use with airborne auxiliary power units
US20090078496A1 (en) * 2007-09-25 2009-03-26 Hamilton Sundstrand Corporation Mixed-flow exhaust silencer assembly
CN102022222A (zh) * 2010-12-08 2011-04-20 中国商用飞机有限责任公司 消声器

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CN2325519Y (zh) * 1995-07-11 1999-06-23 泰州市泰来五金厂 内燃机排气消声器
JP3495487B2 (ja) * 1995-10-25 2004-02-09 本田技研工業株式会社 車両の排気装置
US6039287A (en) * 1996-08-02 2000-03-21 Alliedsignal Inc. Detachable integral aircraft tailcone and power assembly
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CN1629456A (zh) * 2003-12-19 2005-06-22 陈勇兵 一种消声器
CN201412208Y (zh) * 2009-06-09 2010-02-24 郑邑明 一种消声器

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1991008379A1 (fr) * 1989-11-28 1991-06-13 Allied-Signal Inc. Silencieux pour reacteur a double flux
US20050077104A1 (en) * 2003-10-14 2005-04-14 Flintham Stuart A. Serviceable muffler
US20060059674A1 (en) * 2004-09-23 2006-03-23 Williams Nicholas A Procedure for replacement of acoustic liner in integrated exhaust duct muffler for use with airborne auxiliary power units
US20090078496A1 (en) * 2007-09-25 2009-03-26 Hamilton Sundstrand Corporation Mixed-flow exhaust silencer assembly
CN102022222A (zh) * 2010-12-08 2011-04-20 中国商用飞机有限责任公司 消声器

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9145801B2 (en) 2013-07-01 2015-09-29 The Boeing Company Systems and methods for acoustic resonance mitigation

Also Published As

Publication number Publication date
CN102022222B (zh) 2013-05-29
CN102022222A (zh) 2011-04-20

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