JPH02163421A - Suppressing device for fan noise - Google Patents
Suppressing device for fan noiseInfo
- Publication number
- JPH02163421A JPH02163421A JP31816588A JP31816588A JPH02163421A JP H02163421 A JPH02163421 A JP H02163421A JP 31816588 A JP31816588 A JP 31816588A JP 31816588 A JP31816588 A JP 31816588A JP H02163421 A JPH02163421 A JP H02163421A
- Authority
- JP
- Japan
- Prior art keywords
- blade
- fan
- honeycomb core
- noise
- fan noise
- 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.)
- Pending
Links
- 239000000463 material Substances 0.000 claims description 12
- 230000000694 effects Effects 0.000 abstract description 5
- 125000004122 cyclic group Chemical group 0.000 abstract 1
- 239000010410 layer Substances 0.000 description 8
- 230000000737 periodic effect Effects 0.000 description 4
- 239000012790 adhesive layer Substances 0.000 description 2
- 210000004027 cell Anatomy 0.000 description 2
- 238000005192 partition Methods 0.000 description 2
- 230000001743 silencing effect Effects 0.000 description 2
- 230000001413 cellular effect Effects 0.000 description 1
- 210000003850 cellular structure Anatomy 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 239000000470 constituent Substances 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000001629 suppression Effects 0.000 description 1
- 239000011800 void material Substances 0.000 description 1
Landscapes
- Structures Of Non-Positive Displacement Pumps (AREA)
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は、航空機のエンジン等において、ファンのブレ
ードから発生するファンノイ・ズ（騒音）を極力低減さ
せるようにしたファンノイズ低減装置に関する。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a fan noise reduction device for reducing as much as possible the fan noise generated from fan blades in an aircraft engine or the like.
例えば航空機のエンジンにおけるファンノイズは、第４
図に示すように、ファンの回転に伴う各ブレード１のＡ
方向への進行と、Ｂ方向からの気流の流れにより、この
各ブレードｌの表面に生じる周期的な圧力変動２によっ
て発生するノイズであり、特にブレード１の先端部１ａ
における大気の速度が亜音速の場合には、ブレード・パ
ッセージ−フリークエンシイ・ノイズ（Ｂｌａｄｅ Ｐ
ａｓｓａｇｅＦｒｅｑｕｅｎｃｙ Ｎｏ１ｓｅ） と
呼ばれ、この特定周波数のノイズ（騒音）が問題となる
。For example, fan noise in an aircraft engine is
As shown in the figure, the A of each blade 1 as the fan rotates.
This noise is generated by periodic pressure fluctuations 2 that occur on the surface of each blade 1 due to the air flow from the direction B and the air flow from the direction B.
If the atmospheric velocity at is subsonic, then the blade passage-frequency noise (Blade P
The noise of this specific frequency becomes a problem.
従来、この種のファンノイズの低減装置としては、例え
ば、特開昭４９−１０６１１１号として、異なる容積を
持つ入り交じった複数個の共鳴空洞と、この空洞とダク
トとを実質的に接続させる複数個の普通路を設けて音抑
制パネルを構成し、このパネルをエンジンのダクトの壁
として使用したり、特開昭５０−２４６１５号として、
ダクトを部分的に形成する第１壁部材と、この第１壁部
材から離間し該第１壁部材とともに空隙を形成する第２
壁部材と、上記空隙を複数の共振器空洞に分割するため
の仕切板とを含み、この仕切板を第１壁部材と第２壁部
材との間に所定の傾斜を持って取付けて音抑制パネルを
構成し、このパネルをエンジンのダクトに使用したり、
更には特開昭５０−３６３６１号として、細胞組織構造
体材料の第１層と、この第１層に支持された多孔性層と
、この多孔性層上に支持された第２の細胞組織構造体層
と、この第２の細胞組織構造体層上に支持された不透過
性の層とから吸音積層構造体を構成し、この構造体をエ
ンジンにおけるダクトの壁の裏張りとして使用するよう
にしたもの等が種々提案されている。Conventionally, this type of fan noise reduction device has been proposed, for example, as disclosed in Japanese Patent Application Laid-open No. 49-106111, which includes a plurality of mixed resonant cavities having different volumes, and a plurality of resonant cavities that substantially connect the cavities and a duct. A sound suppression panel is constructed by providing several normal passages, and this panel is used as a wall of an engine duct.
a first wall member partially forming a duct; and a second wall member spaced apart from the first wall member and forming a gap together with the first wall member.
It includes a wall member and a partition plate for dividing the void into a plurality of resonator cavities, and the partition plate is installed between the first wall member and the second wall member at a predetermined slope to suppress sound. Configure a panel and use this panel for engine ducts,
Furthermore, JP-A-50-36361 discloses a first layer of cell tissue structure material, a porous layer supported on this first layer, and a second cell tissue structure supported on this porous layer. The body layer and the impermeable layer supported on the second cellular tissue structure layer form an acoustically absorbing laminate structure for use as a lining for a duct wall in an engine. Various methods have been proposed.
しかしながら、上記従来例は、そのいずれもがファンの
ブレードから発生するファンノズルを、その周囲に配し
たダクトを介して間接的に消音するように構成されてい
たため、ダクト壁面に入射しない音に対する消音効果が
小さいばかりでなく、発生原因に対する直接的な騒音低
減対策を図ったものではないため、自ずとその消音効果
にも限度があるといった問題点があると考えられる。However, all of the above conventional examples are configured to indirectly muffle the sound generated from the fan blade through the duct placed around the fan nozzle, and therefore muffle the sound that does not enter the duct wall surface. Not only is the effect small, but since it does not directly address the cause of noise reduction, it is thought that there is a problem in that there is a limit to its silencing effect.
本発明は上記に鑑み、ファンのブレードから発生するフ
ァンノイズそのものの発生を極力抑えることにより、よ
り大きな消音効果を発揮するようにしたものを提供する
ことを目的とする。In view of the above, it is an object of the present invention to provide a device that exhibits a greater noise reduction effect by suppressing as much as possible the generation of fan noise generated from the fan blades.
上記目的を達成するため、本発明にかかるファンノイズ
低減装置は、ファンブレードの表面に、このほぼ全域に
亙る凹部を形成し、この凹部内に上下に連通した複数の
空洞を有するｌ＼ニカムコアを接合埋設し、このハニカ
ムコアの表面に、上記ブレードの表面に適合する有孔表
面材を接合して、ブレードの表面側内部にヘルムホルツ
共鳴を行うヘルムホルツ共鳴部を形成したものである。In order to achieve the above object, the fan noise reduction device according to the present invention has a recess formed on the surface of the fan blade over almost the entire area, and a nicum core having a plurality of vertically communicating cavities in the recess. A perforated surface material suitable for the surface of the blade is bonded to the surface of this honeycomb core to form a Helmholtz resonance part that performs Helmholtz resonance inside the surface side of the blade.
上記のように構成した本発明によれば、ファンノイズの
発生原因となるブレードの周期的な圧力変動は、ブレー
ドの表面内部に形成したヘルムホルツ共鳴部のへルムホ
ルツ共鳴によって吸収、緩和され、これによってブレー
ドによるファンノイズの発生そのものを直接抑えるよう
にすることができる。According to the present invention configured as described above, periodic pressure fluctuations in the blades that cause fan noise are absorbed and alleviated by the Helmholtz resonance of the Helmholtz resonance part formed inside the surface of the blades, thereby It is possible to directly suppress the generation of fan noise caused by the blades.
以下、本発明の一実施例を図面を参照して説明する。 Hereinafter, one embodiment of the present invention will be described with reference to the drawings.
第１図乃至第３図は、本発明の一実施例を示すもので、
ファンの各ブレード１０の表面、即ちブレード１０がフ
ァンの回転に伴って方向Ａに進行し、方向Ｂから気流が
流れる時に、ファンノイズが発生ずるブレード１０の一
方の面には、そのほぼ全域に亙って四部１０ａが形成さ
れている。1 to 3 show an embodiment of the present invention,
The surface of each blade 10 of the fan, that is, when the blade 10 moves in direction A as the fan rotates and airflow flows from direction B, fan noise is generated on almost the entire surface of the blade 10. Four parts 10a are formed all over.
この四部１０ａの底部には、底板１１が接合されている
とともに、この底板１１の上面には、上下に連通ずる複
数の空洞１２ａ、１２ａ・・・を有するセル構造のハニ
カムコア１２の下面が接合され、このハニカムコア１２
の表面には、上記ブレード１０の表面に適合して、この
四部１０ａの上方を該凹部１０ａが外部から見て存在し
ないように滑らかに覆う有孔表面材１３が接合されて、
ヘルムホルツ共鳴を行うヘルムホルツ共鳴部１４が形成
されている。A bottom plate 11 is bonded to the bottom of the four parts 10a, and a bottom surface of a honeycomb core 12 having a cellular structure having a plurality of vertically communicating cavities 12a, 12a, . . . is bonded to the top surface of the bottom plate 11. and this honeycomb core 12
A perforated surface material 13 that conforms to the surface of the blade 10 and smoothly covers the upper part of the four parts 10a so that the recessed part 10a does not exist when viewed from the outside is bonded to the surface of the blade 10.
A Helmholtz resonance section 14 that performs Helmholtz resonance is formed.
これにより、上記各ブレード１０の四部１０ａ内、即ち
各ブレード１０の表面側内部に、ヘルムホルツ共鳴を行
うヘルムホルツ共鳴部１４が備えられている。As a result, a Helmholtz resonance section 14 that performs Helmholtz resonance is provided within the four parts 10a of each blade 10, that is, inside the front surface side of each blade 10.
上記有孔表面材１３は、第２図及び第３図に詳細に示す
ように、接合層１５ａを介して上記ハニカムコア１２の
表面に接合した第１の有孔表面材１３ａと、音響抵抗を
得てより高い消音効果を得るために、この第１の有孔表
面材１３ａの上面に接着層１５ｂを介して接合した第２
の有孔表面材１３ｂとから構成されている。As shown in detail in FIGS. 2 and 3, the porous surface material 13 has an acoustic resistance with a first porous surface material 13a bonded to the surface of the honeycomb core 12 via a bonding layer 15a. In order to obtain a higher silencing effect, a second porous surface material 13a is bonded to the upper surface of the first perforated surface material 13a via an adhesive layer 15b.
and a perforated surface material 13b.
このように、ブレード１０の表面側内部に、ヘルムホル
ツ共鳴を行うヘルムホルツ共鳴部１４を形成することに
より、ファンノイズの発生原因となるブレード１０の周
期的な圧力変動を、このブレード１０の表面側内部に形
成したヘルムホルツ共鳴部１４のへルムホルツ共鳴によ
って吸収、緩和し、これによってブレード１０によるフ
ァンノイズの発生そのものを直接抑えるようなされてい
る。In this way, by forming the Helmholtz resonance part 14 that performs Helmholtz resonance inside the front surface of the blade 10, periodic pressure fluctuations in the blade 10 that cause fan noise can be suppressed inside the front surface of the blade 10. The noise is absorbed and relaxed by the Helmholtz resonance of the Helmholtz resonance section 14 formed in the Helmholtz resonance section 14, thereby directly suppressing the generation of fan noise by the blade 10 itself.
ニーに、上記へルムホルツ共鳴部１４の構成部材、例え
ばハニカムコア１２及び有孔表面材１３等は、例えば金
属または複合材等の高比強度材料から構成されている。Furthermore, the constituent members of the Helmholtz resonance section 14, such as the honeycomb core 12 and the perforated surface material 13, are made of a high specific strength material such as metal or composite material.
本発明は上記のような構成であるので、ファンノイズの
発生原因となるブレードの周期的な圧力変動を、ブレー
ドの表面内部に形成したヘルムホルツ共鳴部のへルムホ
ルッ共鳴によって吸収し、緩和させることができ、これ
によってブレードによるファンノイズそのものの発生を
極力抑えて、ファンノイズによる騒音を極力低減させる
ことができるといった効果がある。Since the present invention has the above-described configuration, periodic pressure fluctuations in the blade that cause fan noise can be absorbed and alleviated by the Helmholtz resonance of the Helmholtz resonance part formed inside the surface of the blade. This has the effect of suppressing the generation of fan noise itself due to the blades and reducing the noise caused by the fan noise as much as possible.
２図は１つのブレードの表面を一部切断して示す拡大平
面図、第３図は第２図の■−■線断面図、第４図はファ
ンノイズの発生原因の説明に付する複数個並んだブレー
ドの概略断面図である。Figure 2 is an enlarged plan view showing a part of the surface of one blade cut away, Figure 3 is a cross-sectional view taken along the line ■-■ in Figure 2, and Figure 4 is an enlarged plan view showing the cause of fan noise. FIG. 3 is a schematic cross-sectional view of blades arranged in a row.
１０・・・ブレード、１０ａ・・・凹部、１１・・・底
板、１２・・・ハニカムコア、１２ａ・・・空洞、１３
・・・有孔表面材、１４・・・ヘルムホルツ共鳴部、１
５ａ、１５ｂ・・・接着層。DESCRIPTION OF SYMBOLS 10... Blade, 10a... Recessed part, 11... Bottom plate, 12... Honeycomb core, 12a... Cavity, 13
... Porous surface material, 14 ... Helmholtz resonance part, 1
5a, 15b...Adhesive layer.
出願人代理人 佐 藤 −雄Applicant's agent: Mr. Sato
Claims (1)
成し、この凹部内に上下に連通した複数の空洞を有する
ハニカムコアを接合埋設し、このハニカムコアの表面に
、上記ブレードの表面に適合する有孔表面材を接合して
、ブレードの表面側内部にヘツムホルツ共鳴を行うヘツ
ムホルツ共鳴部を形成したことを特徴とするファンノイ
ズの低減装置。A recess covering almost the entire area is formed on the surface of the fan blade, and a honeycomb core having a plurality of vertically communicating cavities is bonded and buried in the recess, and the surface of the honeycomb core conforms to the surface of the blade. A fan noise reduction device characterized in that a perforated surface material is bonded to form a Hetumholtz resonance part that performs Hetumholtz resonance inside the surface side of a blade.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP31816588A JPH02163421A (en) | 1988-12-16 | 1988-12-16 | Suppressing device for fan noise |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP31816588A JPH02163421A (en) | 1988-12-16 | 1988-12-16 | Suppressing device for fan noise |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH02163421A true JPH02163421A (en) | 1990-06-22 |
Family
ID=18096198
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP31816588A Pending JPH02163421A (en) | 1988-12-16 | 1988-12-16 | Suppressing device for fan noise |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH02163421A (en) |
-
1988
- 1988-12-16 JP JP31816588A patent/JPH02163421A/en active Pending
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