JPH08201216A - Contraction nozzle for wind tunnel - Google Patents
Contraction nozzle for wind tunnelInfo
- Publication number
- JPH08201216A JPH08201216A JP1159595A JP1159595A JPH08201216A JP H08201216 A JPH08201216 A JP H08201216A JP 1159595 A JP1159595 A JP 1159595A JP 1159595 A JP1159595 A JP 1159595A JP H08201216 A JPH08201216 A JP H08201216A
- Authority
- JP
- Japan
- Prior art keywords
- flow velocity
- main body
- throttle
- wall surface
- contraction nozzle
- 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.)
- Granted
Links
Landscapes
- Aerodynamic Tests, Hydrodynamic Tests, Wind Tunnels, And Water Tanks (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、計測用風洞等に適用さ
れる風洞用縮流ノズルに関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wind tunnel contraction nozzle applied to a measurement wind tunnel or the like.
【０００２】[0002]
【従来の技術】図３に従来の風洞用縮流ノズルを示し、
縮流ノズル本体１の絞り出口付近の壁面形状は先細形と
なっており、ノズル出口端の壁面の傾きは縮流ノズルの
中心軸に対して平行である。2. Description of the Related Art FIG. 3 shows a conventional wind tunnel contraction nozzle,
The wall surface shape of the contraction nozzle main body 1 near the throttle outlet is tapered, and the inclination of the wall surface at the nozzle outlet end is parallel to the central axis of the contraction nozzle.
【０００３】[0003]
【発明が解決しようとする課題】前記の従来の縮流ノズ
ルの形状では、図４に示すように、縮流ノズル出口の空
気の流速分布は、壁面近くで流速が大きく中心付近で流
速が小さいという傾向が顕著であった。このような傾向
が生じる理由は絞りの曲率の作用で壁面に沿う流れに遠
心力が働くからである。In the above-mentioned conventional contraction nozzle, the flow velocity distribution of air at the outlet of the contraction nozzle is large near the wall surface and small near the center as shown in FIG. The tendency was remarkable. The reason for this tendency is that centrifugal force acts on the flow along the wall surface due to the action of the curvature of the throttle.
【０００４】本発明は、前記の問題点を解決し出口の流
速分布を一定にすることができる風洞用縮流ノズルを提
供しようとするものである。The present invention is intended to solve the above-mentioned problems and to provide a contracted flow nozzle for a wind tunnel capable of making the flow velocity distribution at the outlet constant.
【０００５】[0005]
【課題を解決するための手段】本発明の風洞用縮流ノズ
ルは、縮流ノズル本体の絞り出口付近の壁面を、先細形
の部分と同先細形の部分の下流側に続きのど部があり下
流側に拡がるラバール形の部分とで構成した。According to the contracted flow nozzle for a wind tunnel of the present invention, the wall surface near the throttle outlet of the contracted flow nozzle body has a tapered portion and a continuous throat portion on the downstream side of the tapered portion. It is composed of a Laval-shaped part that extends downstream.
【０００６】[0006]
【作用】先細形の壁面形状をもつ縮流ノズル本体の絞り
部分では、前記のように、絞りの曲率の作用で壁面に沿
う流れに遠心力が働き、中心付近より壁面近くの流速が
大きくなるという傾向がある。As described above, in the throttle portion of the contraction nozzle body having the tapered wall shape, the centrifugal force acts on the flow along the wall surface due to the action of the curvature of the throttle, and the flow velocity near the wall surface becomes larger than that near the center. Tends to.
【０００７】本発明では、縮流ノズル本体の絞り出口付
近の壁面を、先細形の部分とこの下流側に続くのど部が
あり下流側に拡がるラバール（Laval)形の部分とで構成
しており、このラバール形の部分の拡がりの曲率の作用
を利用し、先細形の部分で生じた縮流ノズル本体断面内
の流速の不均一性を緩和させ、縮流ノズル本体の絞り出
口面の流速分布の一様化を図ることができる。In the present invention, the wall surface near the throttle outlet of the contraction nozzle body is composed of a tapered portion and a Laval-shaped portion which has a throat portion continuing to the downstream side and expands to the downstream side. , By utilizing the effect of the curvature of the spread of this Laval-shaped portion, the non-uniformity of the flow velocity in the cross-section of the contracted-flow nozzle body, which is caused by the tapered portion, is alleviated, and the flow velocity distribution on the throttle outlet surface of the contracted flow nozzle body Can be made uniform.
【０００８】[0008]
【実施例】本発明の一実施例を、図１及び図２によって
説明する。図１に示すように、矢印方向に空気が流れる
縮流ノズル本体１の絞り出口付近の壁面は、先細形の部
分２とその下流側に続き下流側へ拡がるラバール形の部
分３とで構成され、先細形の部分２に連なるラバール形
の部分３の上流側の部分にはのど部４が形成されてい
る。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to FIGS. As shown in FIG. 1, the wall surface near the throttle outlet of the contraction nozzle body 1 in which air flows in the direction of the arrow is composed of a tapered portion 2 and a Laval-shaped portion 3 that continues to the downstream side and expands to the downstream side. A throat portion 4 is formed on the upstream side of the Laval-shaped portion 3 connected to the tapered portion 2.
【０００９】本実施例では、先細形の部分２の絞りの曲
率によって縮流ノズル本体１の壁面近くの流速が縮流ノ
ズル本体１の中心付近の流速より大きくなる。しかし、
先細形の部分２に続いて下流側に拡がりのど部４がある
ラバール形の部分３が設けられているので、このラバー
ル形の部分３の拡がりの曲率は縮流ノズル本体１の壁面
近くの流速を縮流ノズル本体１の中心付近の流速に比し
て小さくすることになる。従って、先細形の部分２の絞
りの曲率によって生じた縮流ノズル本体１の半径方向に
おける不均一な流速分布を、図２に示すようにラバール
形の部分３によって均一な流速分布とすることができ
る。In this embodiment, the flow velocity near the wall surface of the contraction nozzle body 1 becomes higher than the flow velocity near the center of the contraction nozzle body 1 due to the curvature of the throttle of the tapered portion 2. But,
Since the Laval-shaped portion 3 having the throat portion 4 on the downstream side is provided subsequent to the tapered portion 2, the curvature of the divergence of the Laval-shaped portion 3 depends on the flow velocity near the wall surface of the contraction nozzle body 1. Is smaller than the flow velocity near the center of the contraction nozzle body 1. Therefore, the uneven flow velocity distribution in the radial direction of the contraction nozzle body 1 caused by the curvature of the restriction of the tapered portion 2 can be made uniform by the Laval-shaped portion 3 as shown in FIG. it can.
【００１０】[0010]
【発明の効果】本発明は、縮流ノズル本体の絞り出口付
近の壁面を、先細形の部分とこの下流側に続きのど部が
あり下流側へ拡がるラバール形の部分で構成しているの
で、縮流ノズル本体の出口の流速分布を一様化すること
ができ、また、そのために噴流型の縮流ノズルにおいて
は、その出口での吹き出し音を低減させることができ
る。According to the present invention, the wall surface near the throttle outlet of the contraction nozzle main body is composed of a tapered portion and a Laval-shaped portion which has a continuous throat portion on the downstream side and expands to the downstream side. The flow velocity distribution at the outlet of the contraction nozzle main body can be made uniform, and therefore, in the jet-type contraction nozzle, the blowing noise at the outlet can be reduced.
【図１】本発明の一実施例の要部の説明図である。FIG. 1 is an explanatory diagram of a main part of an embodiment of the present invention.
【図２】図１のＡ部の拡大図である。FIG. 2 is an enlarged view of part A of FIG.
【図３】従来の縮流ノズルの要部の説明図である。FIG. 3 is an explanatory view of a main part of a conventional contraction nozzle.
【図４】図３のＢ部の拡大図である。FIG. 4 is an enlarged view of part B in FIG.
１ 縮流ノズル本体 ２ 先細形の部分 ３ ラバール形の部分 ４ のど部 1 Constriction nozzle body 2 Tapered part 3 Laval part 4 Throat
Claims (1)
を、先細形の部分と同先細形の部分の下流側に続きのど
部があり下流側へ拡がるラバール形の部分とで構成した
ことを特徴とする風洞用縮流ノズル。1. A wall surface in the vicinity of a throttle outlet of a main body of a contraction nozzle is composed of a tapered portion and a Laval-shaped portion having a continuous throat portion downstream of the tapered portion and extending downstream. A characteristic wind tunnel contraction nozzle.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP07011595A JP3082827B2 (en) | 1995-01-27 | 1995-01-27 | Wind tunnel contraction nozzle |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP07011595A JP3082827B2 (en) | 1995-01-27 | 1995-01-27 | Wind tunnel contraction nozzle |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH08201216A true JPH08201216A (en) | 1996-08-09 |
| JP3082827B2 JP3082827B2 (en) | 2000-08-28 |
Family
ID=11782270
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP07011595A Expired - Lifetime JP3082827B2 (en) | 1995-01-27 | 1995-01-27 | Wind tunnel contraction nozzle |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3082827B2 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108363888A (en) * | 2018-03-11 | 2018-08-03 | 广州富森环保科技股份有限公司 | A kind of runner shrinkage curve design method |
| US11718157B2 (en) | 2018-04-11 | 2023-08-08 | Denso Corporation | Air discharge device |
-
1995
- 1995-01-27 JP JP07011595A patent/JP3082827B2/en not_active Expired - Lifetime
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108363888A (en) * | 2018-03-11 | 2018-08-03 | 广州富森环保科技股份有限公司 | A kind of runner shrinkage curve design method |
| CN108363888B (en) * | 2018-03-11 | 2022-03-08 | 广州富森环保科技股份有限公司 | Method for designing flow channel contraction curve |
| US11718157B2 (en) | 2018-04-11 | 2023-08-08 | Denso Corporation | Air discharge device |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3082827B2 (en) | 2000-08-28 |
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