JP3988577B2 - Fluid blowing nozzle - Google Patents

Fluid blowing nozzle Download PDF

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Publication number
JP3988577B2
JP3988577B2 JP2002234292A JP2002234292A JP3988577B2 JP 3988577 B2 JP3988577 B2 JP 3988577B2 JP 2002234292 A JP2002234292 A JP 2002234292A JP 2002234292 A JP2002234292 A JP 2002234292A JP 3988577 B2 JP3988577 B2 JP 3988577B2
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Japan
Prior art keywords
nozzle
blowing nozzle
fluid
blowing
main flow
Prior art date
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Expired - Lifetime
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JP2002234292A
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Japanese (ja)
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JP2004077161A (en
Inventor
靖 高野
貴義 上田
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Hitachi Plant Technologies Ltd
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Hitachi Plant Technologies Ltd
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Description

【0001】
【発明の属する技術分野】
本発明は、風洞設備における流体吹出しノズルに関するものである。
【0002】
【従来の技術】
従来、試験体から発生する気流騒音を測定するための風洞などは、風洞からの騒音を低減するために、風洞の主流吹出しノズルの外周から、風洞主流速より比較的遅い別の気流を流すことにより、室内静止空気と風洞主流との境界層における相対速度差及び圧力変動を減少させていた。
これにより、剪断流が緩和されることによって過大な渦の発生が抑えられ、気流騒音が低減する。
この種の従来技術として、例えば特開平5−5673号公報、特開平11−304639号公報がある。
【0003】
【発明が解決しようとする課題】
上記従来技術では、外側吹出しノズルの吹出し口の開口断面積が、風洞主流吹出しノズルの吹出し口の開口断面積により固定されていた。これは、外側ノズルの吹出し口の開口断面積が一定であることによって吹出し風量も一定であるため、風洞主流と外側から流れ出す気流の干渉する範囲も一定であった。このことから、外側吹出しノズルは風洞主流吹出しノズルに固定されており、風洞主流風の外殻と、外側吹出し風中心との干渉範囲が固定されていた。
【0004】
従って、風洞主流吹出しノズルの外側から流す気流の速度は、風洞主流より比較的遅い速度の一定速だった。
【0005】
本発明の目的は、風洞からの騒音を低減させた流体吹出しノズルを提供することにある。
【0006】
【課題を解決するための手段】
上記目的は、主流吹出しノズルと、この主流吹出しノズルの外周に設けられた外側吹出しノズルとを備えた流体吹出しノズルにおいて、前記外側吹出しノズルは前記主流吹出しノズルの気体供給源とは別体の気体供給源を備えてなり、前記流吹出しノズルから噴出される風の中心位置に対して前記外側吹出しノズルから吹出される風の中心位置を可変できる可変手段を備えたことにより達成される。
【0007】
また、上記目的は、前記可変手段は前記外側吹出しノズルの外板を可変することにより達成される。
【0008】
また、上記目的は、記可変手段は前記外側吹出しノズルの開口断面積を可変することにより達成される。
【0010】
【発明の実施の形態】
従来の流体吹出しノズルは、主流流れ外郭と外側ノズルの吹出し中心の位置が固定されていため、風洞設置時に騒音測定点での風洞暗騒音を最小とするように、外側吹出しノズルの位置や主流流れに対する流速比を調整する必要がある。 このため、実際の風洞運転時に実験や解析における予測のずれや、測定のため気流中に設置した物体の影響などによる主流流れが変化し、風洞の暗騒音が増大した場合でも、外側吹出しノズルは固定されているため、外側吹出しノズルを最適位置に調整することができなかった。
【0011】
この結果、風洞の暗騒音が増大し、試験体からの気流騒音の測定が困難となる場合があった。
【0012】
ところで、主流吹出しノズルから高速の流体が噴射されると、流体ノズル周囲の静止領域と高速流体との干渉によって高速流体の周囲に渦流が発生する。この渦流が騒音の原因となることが知られている。
そこで、上述したように、流体ノズルの外周に高速流体より若干遅い別の気流を吐出する外側吹出しノズルを設けて静止空気と高速流体との境界層に発生する渦流の発生を抑えて騒音を減少させていた。
【0013】
ところが、上述したように外側吹出しノズルを設けた流体吹出しノズルを現地の風洞実験装置等に取り付けた場合、現地の設置条件等により微妙に外側吹出しノズルの位置が一致しない場合がある。
そこで、本発明の発明者らは、外側吹出しノズルの位置を現場の条件に合わせ可変できるようにすることを考えたものである。
【0014】
以下、本発明の流体吹出しノズルを図面を用いて説明する。
図1は本発明の一実施例を備えた流体吹出しノズルの断面図である。
図1において、1は主流吹出しノズルである。2はこの主流吹出しノズルの外周に設けられた外側吹出しノズルである。この外側吹出しノズル2の先端は主流吹出しノズル1の外周に設けられた固定プレート6に固定されている。3は外側吹出しノズル2の先端と外側吹出しノズル本体とを連結する可撓性部材である。4は外側吹出しノズル移動部である。このノズル移動部4は主流吹出しノズル1に設置された固定用プレート6と固定軸5とから構成されている。
【0015】
固定プレート6には予め長穴7が設けられており、この長穴7の長さの範囲内で固定軸5を主流吹出しノズル1と平行に移動させることが出来る。長穴7は外側吹出しノズル2の吹出し風8が主流流れ9の最終端における主流外殻10と交差できる範囲を移動できるものとする。
これにより、これらの干渉する範囲の大きさを変化させることができ、広範囲に渡って、剪断層を緩和させることにより、渦流から発生する騒音を低減することが可能である。
【0016】
尚、この主流吹出しノズル1は図に示すように四角形をしており、外側吹出しノズル2は4面に設けられている。
【0017】
図2は、他の実施例を備えた流体ノズルの断面図である。
図2において、主流吹出しノズル1の外側に、主流吹出しノズルと平行して外側吹出しノズル21が配置されている。外側吹出しノズル21の先端に可撓性部3を設け、外側吹出しノズル移動部41を移動可能とし、外側吹出しノズルの吹出し部の面積を可変とすることにより、外側吹出しノズル21の吹出し風8の流速を変えることができる。
【0018】
これにより、主流流れ9に対する流速比を、騒音が最も下がる範囲に設定可能となる。また、外側吹出しノズル21内に流入する気体81の供給源を、主流吹出しノズル1に流入する気体91の供給源とを別体とすることにより、外側吹出しノズル21の吹出し風8の流速と、主流吹出しノズル1の流速との流速比の設定が容易となる。
また、可撓性部3をヒンジ構造とし、外側吹出しノズル移動部41が、前記ヒンジの軸を中心に回転する構造としてもよい。
【0019】
図3は本発明の他の実施例を備えた流体ノズルの断面図である。
図3において、主流吹出しノズル1の外側に、主流吹出しノズルと平行して外側吹出しノズル21、22が配置されている。外側吹出しノズルにダンパ31、32を設け、外側吹出しノズル吹出し風82、84の流速を制御する。これにより、主流流れに対する流速比を、騒音が最も下がる範囲に設定可能となる。
さらに、試験体設置板11上に試験体12を設置する場合、試験体設置板11の裏面の外側吹出しノズル22のダンパ32を閉めることにより、外側吹出しノズル吹出し風84と試験体設置板11との干渉による騒音の発生を抑制することが可能である。
【0020】
以上のごとく、本実施例によれば、外側吹出しノズルの吹出し位置、内側吹出しノズルの高さ幅及び外側吹出しノズルの面積を可変にすることにより、風洞主流流れの外殻部と外側吹出しノズル気流の干渉位置、範囲を任意に変える事が出来、騒音の低減位置・範囲を変える事が出来るようななった。これにより気流中に置かれた物体の形状やその試験目的に応じた騒音計測において、気流せん断流による騒音の影響が最も少ない状態での騒音計測が可能となった。また吹出しノズル移動部手前につけた抵抗体により、外側吹出しノズルからの気流速度を任意に変化させることが出来、最も騒音を低減させることの出来る風速での騒音計測が可能である。
【0021】
【発明の効果】
本発明によれば、風洞からの騒音を低減させた流体吹出しノズルを提供できる。
【図面の簡単な説明】
【図1】図1は、本発明の第一の実施例を備えた流体吹出しノズルの断面図である。
【図2】図2は、本発明の第二の実施例を備えた流体吹出しノズルの断面図である。
【図3】図3は、本発明の第三の実施例を備えた流体吹出しノズルの断面図である。
【符号の説明】
1・・・主流吹出しノズル、2・・・外側吹出しノズル、3・・・可撓性部材、4・・・外側吹出しノズル移動部、5・・・固定軸、6・・・固定用プレート、7・・・長穴、8・・・吹出し風、9・・・主流流れ、10・・・主流外殻。
[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a fluid blowing nozzle in a wind tunnel facility.
[0002]
[Prior art]
Conventionally, wind tunnels, etc. for measuring airflow noise generated from test specimens, use another airflow that is relatively slower than the wind tunnel main flow velocity from the outer periphery of the wind tunnel main flow outlet nozzle to reduce the noise from the wind tunnel. As a result, the relative velocity difference and the pressure fluctuation in the boundary layer between the indoor still air and the wind tunnel mainstream were reduced.
Thereby, generation | occurrence | production of an excessive vortex is suppressed by relieving a shear flow, and airflow noise reduces.
As this type of prior art, there are, for example, JP-A-5-5673 and JP-A-11-304039.
[0003]
[Problems to be solved by the invention]
In the above prior art, the opening cross-sectional area of the outlet of the outer outlet nozzle is fixed by the opening cross-sectional area of the outlet of the main wind outlet nozzle. This is because the blowout air volume is constant due to the constant opening cross-sectional area of the blowout port of the outer nozzle, and the range where the wind tunnel main flow and the airflow flowing from the outside interfere is also constant. For this reason, the outer blowing nozzle is fixed to the wind tunnel mainstream blowing nozzle, and the interference range between the outer shell of the wind tunnel mainstream wind and the outer blowing wind center is fixed.
[0004]
Therefore, the velocity of the airflow flowing from the outside of the wind tunnel main flow blowing nozzle was a constant speed that was relatively slower than the wind tunnel main flow.
[0005]
An object of the present invention is to provide a fluid blowing nozzle in which noise from a wind tunnel is reduced.
[0006]
[Means for Solving the Problems]
The object is to provide a fluid blowing nozzle comprising a main flow blowing nozzle and an outer blowing nozzle provided on the outer periphery of the main flow blowing nozzle, wherein the outer blowing nozzle is a gas separate from the gas supply source of the main flow blowing nozzle. it comprises a source is achieved by having a variable means capable of varying the center position of the wind blown out from the outer blow nozzle with respect to the center position of the wind ejected from the main flow blowoff nozzle.
[0007]
Further, the above object is achieved by the variable means changing the outer plate of the outer blowing nozzle.
[0008]
The above-described object can be achieved by varying the opening cross-sectional area of the outer blowing nozzle.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
Since the position of the main flow flow outline and the outer nozzle blowing center is fixed in the conventional fluid blowing nozzle, the position of the outer blowing nozzle and the main flow flow are set so that the wind tunnel background noise is minimized when the wind tunnel is installed. It is necessary to adjust the flow rate ratio with respect to. For this reason, even if the mainstream flow changes due to deviations in predictions in experiments and analysis during actual wind tunnel operation or the influence of objects installed in the airflow for measurement, the outer blowout nozzle is Since it is fixed, the outer blowing nozzle could not be adjusted to the optimum position.
[0011]
As a result, the background noise of the wind tunnel increases, and it may be difficult to measure the airflow noise from the specimen.
[0012]
By the way, when a high-speed fluid is ejected from the main flow blowing nozzle, a vortex is generated around the high-speed fluid due to the interference between the stationary region around the fluid nozzle and the high-speed fluid. It is known that this vortex causes noise.
Therefore, as described above, an outer blowing nozzle that discharges another airflow that is slightly slower than the high-speed fluid is provided on the outer periphery of the fluid nozzle to suppress the generation of vortex generated in the boundary layer between static air and high-speed fluid, thereby reducing noise. I was letting.
[0013]
However, as described above, when the fluid blowing nozzle provided with the outer blowing nozzle is attached to a local wind tunnel experimental apparatus or the like, the position of the outer blowing nozzle may not be slightly matched depending on the installation conditions at the site.
In view of this, the inventors of the present invention have considered that the position of the outer blowout nozzle can be varied in accordance with on-site conditions.
[0014]
Hereinafter, the fluid blowing nozzle of the present invention will be described with reference to the drawings.
FIG. 1 is a cross-sectional view of a fluid blowing nozzle provided with an embodiment of the present invention.
In FIG. 1, 1 is a mainstream blowing nozzle. Reference numeral 2 denotes an outer blowing nozzle provided on the outer periphery of the mainstream blowing nozzle. The tip of the outer blowing nozzle 2 is fixed to a fixed plate 6 provided on the outer periphery of the mainstream blowing nozzle 1. Reference numeral 3 denotes a flexible member that connects the tip of the outer blowing nozzle 2 and the outer blowing nozzle body. 4 is an outer blowing nozzle moving part. The nozzle moving unit 4 is composed of a fixing plate 6 and a fixed shaft 5 installed in the mainstream blowing nozzle 1.
[0015]
A long hole 7 is provided in the fixed plate 6 in advance, and the fixed shaft 5 can be moved in parallel with the main flow outlet nozzle 1 within the length of the long hole 7. It is assumed that the long hole 7 can move in a range in which the blowing air 8 of the outer blowing nozzle 2 can intersect the main flow outer shell 10 at the final end of the main flow 9.
Thereby, the size of these interference ranges can be changed, and noise generated from the vortex can be reduced by relaxing the shear layer over a wide range.
[0016]
In addition, this mainstream blowing nozzle 1 has a rectangular shape as shown in the figure, and the outer blowing nozzle 2 is provided on four surfaces.
[0017]
FIG. 2 is a cross-sectional view of a fluid nozzle provided with another embodiment.
In FIG. 2, an outer outlet nozzle 21 is arranged outside the mainstream outlet nozzle 1 in parallel with the mainstream outlet nozzle. The flexible part 3 is provided at the tip of the outer blowing nozzle 21, the outer blowing nozzle moving part 41 is movable, and the area of the blowing part of the outer blowing nozzle is made variable, so that the blowing air 8 of the outer blowing nozzle 21 can be changed. The flow rate can be changed.
[0018]
Thereby, the flow rate ratio with respect to the main flow 9 can be set in a range where the noise is reduced most. Further, by making the supply source of the gas 81 flowing into the outer blowing nozzle 21 and the supply source of the gas 91 flowing into the main flow blowing nozzle 1 separate, the flow velocity of the blowing air 8 of the outer blowing nozzle 21 is Setting of the flow rate ratio with the flow rate of the main flow blowing nozzle 1 becomes easy.
Alternatively, the flexible portion 3 may have a hinge structure, and the outer blowing nozzle moving portion 41 may rotate around the hinge axis.
[0019]
FIG. 3 is a cross-sectional view of a fluid nozzle provided with another embodiment of the present invention.
In FIG. 3, outside blowing nozzles 21 and 22 are arranged outside the main stream blowing nozzle 1 in parallel with the main stream blowing nozzle. Dampers 31 and 32 are provided in the outer blowing nozzles to control the flow rates of the outer blowing nozzle blowing airs 82 and 84. Thereby, the flow rate ratio with respect to the main flow can be set in a range where the noise is reduced most.
Furthermore, when installing the test body 12 on the test body installation plate 11, by closing the damper 32 of the outer air discharge nozzle 22 on the back surface of the test body installation board 11, It is possible to suppress the generation of noise due to the interference.
[0020]
As described above, according to the present embodiment, the outer shell portion of the wind tunnel main flow and the outer blowing nozzle airflow are made variable by changing the blowing position of the outer blowing nozzle, the height width of the inner blowing nozzle, and the area of the outer blowing nozzle. The interference position and range can be changed arbitrarily, and the noise reduction position and range can be changed. This makes it possible to measure the noise in the state where the influence of noise caused by the air flow shear flow is minimal in the noise measurement according to the shape of the object placed in the air flow and the purpose of the test. Further, the air flow velocity from the outer blowout nozzle can be arbitrarily changed by a resistor attached in front of the blowout nozzle moving portion, and noise measurement at a wind speed that can reduce the noise most is possible.
[0021]
【The invention's effect】
ADVANTAGE OF THE INVENTION According to this invention, the fluid blowing nozzle which reduced the noise from a wind tunnel can be provided.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view of a fluid blowing nozzle provided with a first embodiment of the present invention.
FIG. 2 is a cross-sectional view of a fluid blowing nozzle provided with a second embodiment of the present invention.
FIG. 3 is a cross-sectional view of a fluid blowing nozzle provided with a third embodiment of the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Mainstream blowing nozzle, 2 ... Outer blowing nozzle, 3 ... Flexible member, 4 ... Outer blowing nozzle moving part, 5 ... Fixed shaft, 6 ... Fixing plate, 7 ... long hole, 8 ... blowing air, 9 ... mainstream flow, 10 ... mainstream outer shell.

Claims (3)

主流吹出しノズルと、この主流吹出しノズルの外周に設けられた外側吹出しノズルとを備えた流体吹出しノズルにおいて、
前記外側吹出しノズルは前記主流吹出しノズルの気体供給源とは別体の気体供給源を備えてなり、前記主流吹出しノズルから噴出される風の中心位置に対して前記外側吹出しノズルから吹出される風の中心位置を可変できる可変手段を備えたことを特徴とする流体吹出しノズル。
In a fluid outlet nozzle comprising a mainstream outlet nozzle and an outer outlet nozzle provided on the outer periphery of the mainstream outlet nozzle,
The outer blow nozzle includes a gas supply source that is separate from the gas supply source of the main flow blow nozzle, and the wind blown from the outer blow nozzle with respect to the center position of the wind blown from the main flow blow nozzle. A fluid discharge nozzle comprising a variable means capable of changing the center position of the fluid.
前記可変手段は前記外側吹出しノズルの外板を可変することを特徴とする請求項1記載の流体吹出しノズル。  2. The fluid blowing nozzle according to claim 1, wherein the variable means varies the outer plate of the outer blowing nozzle. 前記可変手段は前記外側吹出しノズルの開口断面積を可変することを特徴とする請求項1記載の流体吹出しノズル。  The fluid blowing nozzle according to claim 1, wherein the variable means varies an opening sectional area of the outer blowing nozzle.
JP2002234292A 2002-08-12 2002-08-12 Fluid blowing nozzle Expired - Lifetime JP3988577B2 (en)

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