JPS6176929A - Control device of wind tunnel boundary layer - Google Patents
Control device of wind tunnel boundary layerInfo
- Publication number
- JPS6176929A JPS6176929A JP59196774A JP19677484A JPS6176929A JP S6176929 A JPS6176929 A JP S6176929A JP 59196774 A JP59196774 A JP 59196774A JP 19677484 A JP19677484 A JP 19677484A JP S6176929 A JPS6176929 A JP S6176929A
- Authority
- JP
- Japan
- Prior art keywords
- boundary layer
- ground surface
- ground
- wind tunnel
- vehicle
- 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
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M9/00—Aerodynamic testing; Arrangements in or on wind tunnels
- G01M9/02—Wind tunnels
- G01M9/04—Details
Landscapes
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- General Physics & Mathematics (AREA)
- Aerodynamic Tests, Hydrodynamic Tests, Wind Tunnels, And Water Tanks (AREA)
Abstract
Description
【発明の詳細な説明】
産業上の利用分野
本発明は、車両の空力特性を検討するときなどに用いる
風洞装置の、地面に生じる境界層の影響を抑制する風洞
境界層制御装置に関する。DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a wind tunnel boundary layer control device for suppressing the influence of a boundary layer generated on the ground in a wind tunnel device used for examining the aerodynamic characteristics of a vehicle.
従来の技術
車両の走行中の空力特性を検討する場合に、実走行の代
りに屡々風洞装置が用いられる。従来の風洞装置は、第
５図に示すように、風洞装置１１内の地面１２上に車両
１３を静置し、風を送って実走行を模擬して試験が行な
われる。しかしながら、通常の風洞装置では、地面１２
や壁１４が固定されているために、地面１２に沿って生
じる境界層１５の発達により実走行の条件と異なってく
る。とくに車両は地面近くを走行していることから、地
面の境界層１５の影響を顕著に受ける。BACKGROUND OF THE INVENTION When examining the aerodynamic characteristics of a conventional vehicle while it is running, wind tunnel equipment is often used instead of actual driving. In the conventional wind tunnel apparatus, as shown in FIG. 5, a test is conducted by placing a vehicle 13 still on the ground 12 inside the wind tunnel apparatus 11 and blowing wind to simulate actual driving. However, in a normal wind tunnel device, the ground 12
Since the walls 14 are fixed, the conditions differ from actual driving conditions due to the development of a boundary layer 15 along the ground 12. In particular, since vehicles run close to the ground, they are significantly affected by the boundary layer 15 of the ground.
この境界層を取り除〈従来方法として、いすず技報ＵＤ
Ｃ１１４，６０７３Ｆ乗用車模型の風洞試験での問題点
と実走行試験について」において述べられているように
、すなわち第６図に示すように、地面をベルト１６から
構成して車両１３の車輪１７を回転させつつ地面を可動
させる方法や、第７図に示すうに、車両１３の前方で地
面１２に吸込口１８を設けて境界層を吸込む方法や、ざ
らには第８図に示すように、車両１３に鏡対称にもう一
つの車両モデル１９を設けて地面を除去する方法等があ
る。This boundary layer is removed (as a conventional method, Isuzu Giho UD
C114, 6073F Regarding Problems in Wind Tunnel Tests and Actual Driving Tests for Passenger Car Models", that is, as shown in FIG. As shown in FIG. 7, a suction port 18 is provided in the ground 12 in front of the vehicle 13 to suck in the boundary layer. There is a method in which another vehicle model 19 is provided mirror-symmetrically and the ground is removed.
発明が解決しようとする問題点
しかしながら、上記したベルト法（第５図の方法）、固
定地面板境界層吸込法（第６図の方法）、鏡像法（第７
図の方法）は、いずれも設備が大がかりなものとなり、
８価となって、容易に使用できるものではなかった。Problems to be Solved by the Invention However, the above-mentioned belt method (method shown in Fig. 5), fixed ground plate boundary layer suction method (method shown in Fig. 6), mirror image method (method shown in Fig. 7),
The method shown in the figure) requires large-scale equipment;
It was octavalent and could not be used easily.
本発明は、上記の問題を解消するために、風洞装置にお
ける地面に沿って生じる境界層を取り除くことを安価で
かつ手軽に行なえる装置を提供することを目的とする。SUMMARY OF THE INVENTION In order to solve the above problems, it is an object of the present invention to provide a device that can easily and inexpensively remove the boundary layer that occurs along the ground in a wind tunnel device.
問題点を解決するための手段
この目的を達成するために、本発明の風洞境界層制御装
置においては、風洞の地面の上方に、地面に沿って生じ
る圓の境界層の厚さ分だけ浮かせて、平板から成る第２
地面板が設置されている。Means for Solving the Problems In order to achieve this object, the wind tunnel boundary layer control device of the present invention has a wind tunnel boundary layer that is suspended above the ground of the wind tunnel by the thickness of the circular boundary layer that occurs along the ground. , the second consisting of a flat plate
A ground plate has been installed.
この第２地面板は、その長さが車両全長より若干大程度
とされて車両全長に近づけられており、かつその前方先
端は地面方向に傾斜されている。The second ground plate has a length that is slightly larger than the overall length of the vehicle and is closer to the overall length of the vehicle, and its front end is inclined toward the ground.
作用
平板の上に発達する境界層は後方になる程厚くなる。し
たがって風洞内も先端から発生した境界層は風洞の下流
になる程境界層が厚くなる。そこで風洞内に境界層の厚
さ分だけ浮かせた状態で必要最小限の長さの第２地面板
が設置される。これにより風洞の地面近くで発生する境
界層を第２地面板と地面との間のスペースを通してバイ
パスさせることができ、車両に与える境界層の影響を除
去することができる。第２地面板にも境界層が生じるが
、第２地面板は必要最小限の長さに設定されているので
、第２地面板の境界層は極力薄く保たれ、その影響は小
ざい。The boundary layer that develops above the working plate becomes thicker toward the rear. Therefore, the boundary layer generated from the tip of the wind tunnel becomes thicker as it goes downstream of the wind tunnel. Therefore, a second ground plate of the minimum required length is installed inside the wind tunnel, floating by the thickness of the boundary layer. As a result, the boundary layer generated near the ground of the wind tunnel can be bypassed through the space between the second ground plate and the ground, and the influence of the boundary layer on the vehicle can be eliminated. A boundary layer also occurs on the second ground plate, but since the second ground plate is set to the minimum necessary length, the boundary layer of the second ground plate is kept as thin as possible, and its influence is small.
実施例
以下に、本発明の風洞境界制ａｌｌ装置の望ましい実施
例を図面を参照して説明する。Embodiments Below, preferred embodiments of the wind tunnel boundary control all device of the present invention will be described with reference to the drawings.
第１図は本発明実施例装置を示している。図において、
１は風洞装置の風の吹出口であり、２は風の吸込み口で
ある。吹出口１と吸込み口２との間に空力を測定する車
両３が静置される。吹出口１と吸込み口２との間の地面
４上には、地面４から浮かせて第２地面板５が設けられ
る。第２地面板５は地面４に生じる境界層６の厚さｈだ
け地面４から浮かせである。第２地面板５は平板から成
゛す、その吹出口１側の先端５ａは、第２図に示
すように、地面４に対して傾斜されている。車両３ムこ
の第２地面板５上に静置される６第２地面板５の長さは
、測定する車両３の全長よりは長く、かつ車両３の全長
に近づけである。ただし、第２地面板５の長さは、測定
する車両３の全長の２倍よりは小である。FIG. 1 shows an apparatus according to an embodiment of the present invention. In the figure,
1 is a wind outlet of the wind tunnel apparatus, and 2 is a wind inlet. A vehicle 3 whose aerodynamic force is to be measured is placed between an air outlet 1 and an air inlet 2. A second ground plate 5 is provided on the ground 4 between the air outlet 1 and the suction port 2 so as to be suspended from the ground 4. The second ground plate 5 is lifted from the ground 4 by the thickness h of the boundary layer 6 formed on the ground 4. The second ground plate 5 is made of a flat plate, and its tip 5a on the outlet 1 side is inclined with respect to the ground 4, as shown in FIG. The length of the second ground plate 5 placed on the second ground plate 5 of the vehicle 3 is longer than the total length of the vehicle 3 to be measured, and is close to the total length of the vehicle 3. However, the length of the second ground plate 5 is smaller than twice the total length of the vehicle 3 to be measured.
上記のように構成された装置においては、空力特性を測
定すべき車両３を吹出口１と吸込み口２との間で第２地
面板５上に静置し、吹出口１より吸込み口２に向って風
を送ってテストが行なわれる。In the device configured as described above, the vehicle 3 whose aerodynamic characteristics are to be measured is placed on the second ground plate 5 between the air outlet 1 and the air inlet 2, and the air flow is connected from the air outlet 1 to the air inlet 2. Tests are carried out by blowing wind in the opposite direction.
このとき、地面４には境界層６が生じる。境界層６は吹
出口１から吸込み口２に向って徐々に厚くなる。しかし
、地面４に沿って生じる境界層６は、地面４と第２地面
板５との間の空間を通ってバイパスされ、後方に流れて
吸込み口２より排出される。したがって地面４に生じる
境界層６は車両３には直接的には影響を与えない。第２
地面板５にも、先端から後端にかけて徐々に厚くなる境
界ＩＩ！１７が生じるが、第２地面板５が短かいので、
自動車３に与える影響は小である。また、第２地面板５
の先端が前傾しているので、第２地面板５の境界層７の
発達が抑えられると共に、地面４と第２地面板５との間
への境界層６の吸込みを容易にしている。At this time, a boundary layer 6 is generated on the ground 4. The boundary layer 6 gradually becomes thicker from the outlet 1 to the inlet 2. However, the boundary layer 6 generated along the ground surface 4 is bypassed through the space between the ground surface 4 and the second ground plate 5, flows backward, and is discharged from the suction port 2. Therefore, the boundary layer 6 generated on the ground 4 does not directly affect the vehicle 3. Second
Also on the ground plate 5, there is a boundary II that gradually becomes thicker from the tip to the rear edge! 17 occurs, but since the second ground plate 5 is short,
The effect on car 3 is small. In addition, the second ground plate 5
Since the tip is tilted forward, the development of the boundary layer 7 of the second ground plate 5 is suppressed, and the boundary layer 6 is easily sucked into between the ground 4 and the second ground plate 5.
第３図は本発明の作用をさらに定量的に示している。こ
れらの図は、風洞装置の測定位ｆｌｉＡ、Ｂ、・・・・
・・、■（距離間隔は第４図に示しである）の位置にお
いて、島さ方向の速度分布を示したものである。図中実
線は第２地面板５を設けない場合、破線は第２地面５を
設けた場合を示している。地面からかなり上方になると
風速は地面４の影響を受けないため、吹出速度と同じ速
度Ｖカとなる。FIG. 3 further quantitatively shows the effect of the present invention. These figures show the measurement positions fliA, B,... of the wind tunnel device.
This figure shows the velocity distribution in the direction of the island at the positions of . In the figure, solid lines indicate the case where the second ground plate 5 is not provided, and broken lines indicate the case where the second ground plate 5 is provided. When the air is considerably above the ground, the wind speed is not affected by the ground 4, so the speed is V, which is the same as the blowing speed.
境界Ｈ６ハＩｌｌ速ＶがＶ＝０．９９ＸＶｏｏとな６１
１さにより一般的に定義されている。この場合、ＡｌＢ
、・・・・・・、■における境界層厚さは、第２地面板
を設けない風洞ではδ１となるが、本考案のように第２
地面板５を設置すると、第２地面板５上に出る境界層７
の厚さはδ２どなって、δ１の約半分となることが分っ
た。Boundary H6-Ill speed V is V=0.99XVoo61
It is generally defined by 1. In this case, AlB
The boundary layer thickness at , ..., ■ is δ1 in a wind tunnel without a second ground plate, but when the second
When the ground plate 5 is installed, a boundary layer 7 appears on the second ground plate 5.
It was found that the thickness of δ2 is about half of δ1.
発明の効果
したがって、本発明の風洞境界層制御装置によるときは
、風洞の地面に対し、その境界層の厚さ分だけ浮かせて
第２地面板を設けたので、地面に生じる境界層をバイパ
スでき、境界層の空力特性を調べる車両に与える影響を
小にすることができる。しかも、第２地面板を設けるだ
けで済むので、手軽でかつ安価に行なうことができると
いう効果が得られる。Effects of the Invention Therefore, when using the wind tunnel boundary layer control device of the present invention, since the second ground plate is provided floating above the ground of the wind tunnel by the thickness of the boundary layer, the boundary layer generated on the ground can be bypassed. , it is possible to reduce the influence on the vehicle in which the aerodynamic characteristics of the boundary layer are investigated. Moreover, since it is only necessary to provide the second ground plate, it is possible to obtain the effect that the process can be carried out easily and at low cost.
第１図は本発明の一実施例に係る風洞境界層制御装置の
側面図、
第２図は第１図の装置にＪ３ける第２地面板先端の側面
図、
第３図は第１図の装置において第２地面板を設けた場合
と設けな場合における境界層の発達を示す風速分布図、
第４図は第３図の測定位置を示す装置の部分側面図、
第５図は従来の風洞の側面図、
第６図は従来のベルト方式の風洞側面図、第７図は従来
の境界吸込み式の風洞の側面図、第８図は従来の鏡像式
の風洞の側面図、である。
１・・・・・・吹出口
２・・・・・・殴込み口
３・・・・・・車両
４・・・・・・地面
５・・・・・・第２地面板
６．７・・・・・・境界層
第１図
第２図
４燵勿
第４図
（ｍｍ）
１１ 第５図
第６図
第７図
第８図
１３゛FIG. 1 is a side view of a wind tunnel boundary layer control device according to an embodiment of the present invention, FIG. 2 is a side view of the tip of the second ground plate at J3 of the device shown in FIG. 1, and FIG. 3 is a side view of the device shown in FIG. Wind speed distribution diagram showing the development of the boundary layer when the second ground plate is installed in the device and when it is not installed. Figure 4 is a partial side view of the device showing the measurement position in Figure 3. Figure 5 is a conventional wind tunnel. FIG. 6 is a side view of a conventional belt type wind tunnel, FIG. 7 is a side view of a conventional boundary suction type wind tunnel, and FIG. 8 is a side view of a conventional mirror image type wind tunnel. 1...Air outlet 2...Blowout port 3...Vehicle 4...Ground 5...Second ground plate 6.7. ... Boundary layer Fig. 1 Fig. 2 Fig. 4 (mm) 11 Fig. 5 Fig. 6 Fig. 7 Fig. 8 Fig. 13゛
Claims (1)
界層の厚さ分だけ浮かせて、平板から成る第２地面板を
設置し、該第２地面板の長さを車両全長に近づけると共
に、第２地面板の先端を地面方向に傾斜させたことを特
徴とする風洞境界層制御装置。(1) A second ground plate made of a flat plate is installed above the ground of the wind tunnel by the thickness of the boundary layer of the wind generated along the ground, and the length of the second ground plate is equal to the overall length of the vehicle. A wind tunnel boundary layer control device characterized in that the tip of the second ground plate is inclined toward the ground.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP59196774A JPS6176929A (en) | 1984-09-21 | 1984-09-21 | Control device of wind tunnel boundary layer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP59196774A JPS6176929A (en) | 1984-09-21 | 1984-09-21 | Control device of wind tunnel boundary layer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS6176929A true JPS6176929A (en) | 1986-04-19 |
Family
ID=16363404
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP59196774A Pending JPS6176929A (en) | 1984-09-21 | 1984-09-21 | Control device of wind tunnel boundary layer |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6176929A (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1338881A1 (en) * | 2002-02-21 | 2003-08-27 | European Community | Chassis dynamometer for testing a vehicle in a wind tunnel |
| JP2007503573A (en) * | 2003-08-22 | 2007-02-22 | バイエリッシェ モートーレン ウエルケ アクチエンゲゼルシャフト | Test stand and method for aerodynamic measurements in vehicles |
| WO2009037917A1 (en) * | 2007-09-20 | 2009-03-26 | Mitsubishi Heavy Industries, Ltd. | Measuring area of wind-tunnel testing apparatus, and wind-tunnel testing apparatus using the same |
| JP2009540288A (en) * | 2006-06-05 | 2009-11-19 | ピニンファリーナ・ソシエタ・ペル・アチオニ | A system that simulates ground effects to inspect cars or their statues in a wind tunnel |
| WO2023136180A1 (en) * | 2022-01-13 | 2023-07-20 | 株式会社日本風洞製作所 | Measuring device and wind tunnel test device using same |
-
1984
- 1984-09-21 JP JP59196774A patent/JPS6176929A/en active Pending
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1338881A1 (en) * | 2002-02-21 | 2003-08-27 | European Community | Chassis dynamometer for testing a vehicle in a wind tunnel |
| WO2003071248A1 (en) * | 2002-02-21 | 2003-08-28 | European Community | Chassis dynanometer |
| JP2007503573A (en) * | 2003-08-22 | 2007-02-22 | バイエリッシェ モートーレン ウエルケ アクチエンゲゼルシャフト | Test stand and method for aerodynamic measurements in vehicles |
| JP2009540288A (en) * | 2006-06-05 | 2009-11-19 | ピニンファリーナ・ソシエタ・ペル・アチオニ | A system that simulates ground effects to inspect cars or their statues in a wind tunnel |
| WO2009037917A1 (en) * | 2007-09-20 | 2009-03-26 | Mitsubishi Heavy Industries, Ltd. | Measuring area of wind-tunnel testing apparatus, and wind-tunnel testing apparatus using the same |
| GB2465496A (en) * | 2007-09-20 | 2010-05-26 | Mitsubishi Heavy Ind Ltd | Measuring area of wind-tunnel testing apparatus, and wind-tunnel testing apparatus using the same |
| US8042386B2 (en) | 2007-09-20 | 2011-10-25 | Mitsubishi Heavy Industries, Ltd. | Test section for wind-tunnel testing apparatus and wind tunnel test apparatus employing the same |
| GB2465496B (en) * | 2007-09-20 | 2012-01-04 | Mitsubishi Heavy Ind Ltd | Test section for wind-tunnel testing apparatus and wind tunnel test apparatus employing the same |
| WO2023136180A1 (en) * | 2022-01-13 | 2023-07-20 | 株式会社日本風洞製作所 | Measuring device and wind tunnel test device using same |
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