JPH0510847A - Environmental wind tunnel test equipment and blowing nozzle for the equipment - Google Patents

Abstract

(57) [Abstract] [Purpose] An object is to provide an environmental wind tunnel device and a blowing nozzle capable of easily changing the blowing area. [Structure] In a wind tunnel blow-out nozzle 2, the lower plate and both side faces of the blow-out nozzle are fixed, the upper plate contractor plate 2a is movable in the vertical direction, and the upper plate contractor plate 2a is in a downward fixed position. At the (height Hb), the detachable contraction pads 7a, 7b, 7c, and
7d is attached to change the blowing area of the blowing nozzle. [Effect] Equipped with blowout nozzles having different blowout areas as in the conventional case, one blowout nozzle and a compact lightweight detachable contraction pad can be used to change the blowout area without installing a device for replacing the blowout nozzles. Reduction (space saving, conventional 1
/ 3) and cost reduction can be obtained.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an environmental wind tunnel test apparatus such as an environmental test apparatus for an automobile and a blowing nozzle for the apparatus.

[0002]

2. Description of the Related Art As a structure for changing the blowing nozzle area of the wind tunnel of an environmental wind tunnel device, for example, a structure for changing only the contraction plates on the upper surface to be movable, a structure for changing only the contraction plates on both side surfaces to be movable, When the vertical direction and the horizontal direction are changed at the same time to change the area, there is known a structure in which nozzles of different types are replaced.

[0003] Related to this kind of thing, for example, "Ebara Time Report" (pages 25 to 30) No. 13
6 (1987-1).

[0004]

As a problem in the case of the structure in which two kinds of nozzles having different blowing areas are exchanged in the above-mentioned prior art, there is a problem that the space is wide enough to accommodate another blowing nozzle. However, there is such a problem that the transport moving mechanism for replacing the two blowing nozzles becomes large-scale, the cost is increased, and it is practically impossible to cope with three or more blowing areas.

An object of the present invention is to provide an environmental wind tunnel testing device and a blowing nozzle for the device, which can easily change the blowing area.

[0006]

In order to achieve the purpose of changing the blowing area of the air flow blown from the blowing nozzle at the same time in the left-right direction and the upward direction, the lower surface of the blowing nozzle and both sides (left and right) of the contracting plate are fixed, and the contracting plate of the upper surface is fixed. Is movable in the vertical direction so that the compression plate on the upper surface can be fixed at a lower position, and the compression plate pats with detachable lightweight panel structure are mounted inside the compression plates on both sides (left and right). Since the airflow blown out from the air outlet nozzle is compressed along the inner surface side of the contraction plate on the upper surface and the detachable contraction pad, the airflow area is left and right. It has the effect of changing the direction and the upward direction at the same time.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment of the present invention will be described below with reference to FIGS.
Will be described.

In FIG. 1, 1 is a wind tunnel (side fixed) part, 2 is a blowing nozzle, 3 is a test vehicle, and 2a, 2b and 2c are a movable contracting plate and a contracting plate on the upper surface of the blowing nozzle, respectively. It is a drive mechanism for moving up and down and a hinge for moving the same contraction plate. Reference numeral 4 is a rear deflector for changing the air flow in the rear part of the vehicle under test 3 toward the wind tunnel suction duct 5 in a direction perpendicular to the air flow. Reference numeral 6 denotes a chassis roller of a chassis dynamometer for absorbing power in the running state of the test vehicle.

In FIG. 2, when the blowing area of the blowing nozzle is large, it is shown in the width direction Wa and the height direction Ha, and when the blowing area is small, it is shown in the width direction Wb and the height direction Hb.

Here, the case where the blowing area is increased from large to small will be described.

First, the movable contraction plates 2a on both sides (left and right) are moved to lower the movable contraction plate 2a on the upper side to set the height to Hb. Next, inside the contraction plates on both sides of the blow-out nozzle, the structure of the detachable lightweight panel was adopted.
By mounting and fixing a, 7b, 7c, and 7d, the width direction of the blowout nozzle is reduced to the dimension of Wb. By doing so, the blowing area of the blowing nozzle can be reduced from Fa = Wa × Ha to Fb = Wb × Hb.

FIG. 3 is an explanatory view of a detailed structure of the contraction pads 7a and 7b.

In FIG. 3, the contraction pad has a two-part structure of a lower part 7a and an upper part 7b as shown in the figure. This is to make the work easier when attaching or detaching the two-piece structure rather than the one-piece structure. That is, when the contraction pads 7a and 7b are attached, the lower contraction pad 7a is first attached. In this case, the contraction pad 7a is provided with a mounting bolt 8a.
On the other hand, on the other hand, the contraction plate on the side surface of the blow-out nozzle 2 is machined together with this bolt 8a and a mounting hole (not shown) is formed.
The bolt 8a is inserted into this hole and then tightened with a nut to mount it. Incidentally, 9a is provided with a hand for convenience in attaching and detaching.

Next, the upper contraction pad 7b is attached. However, since the height of the contraction pads 7a to 7c is higher toward the upstream side of the blowout nozzle (from the front to the back of the figure), once the contraction pad 7a is put inside the blowout nozzle. Then, on the upper surface of the lower contraction pad 7a,
The upper contraction pad 7b is put on and slid so that it is positioned while moving toward the front, and the lower contraction pad 7a is attached in the same manner.

Further, the removing method is carried out by following the above sequence in the reverse direction.

On the other hand, the right side is attached or detached by the same procedure.

In the structure of the contraction pads 7a to 7c, the wind speed becomes as high as 30 to 50 m / s at the tip of the blowing nozzle to receive the wind pressure. In addition to being a prerequisite for having rigidity, it must be lightweight because it can be easily held by human hands and is convenient to attach and detach. Further, since the shape has a curved portion, workability is good, and it is necessary to be economical and producible.

FIG. 3 shows a decompression type light-weight panel structure contraction pad which meets the above conditions. The exterior (outer surface) is made of a thin aluminum material, and the inside is filled with hard urethane injection foam. It has a structured structure. For this reason, it is light enough to be carried by human hands, and curved parts can be processed arbitrarily, and the urethane inside adheres to the inner surface of the aluminum plate during injection foaming (great adhesion), and urethane is hard. Therefore, since it has sufficient strength against external force and rigidity against deformation, it is suitable as a contraction pad.

Instead of injecting and foaming the above urethane, a plurality of aluminum partition plates are put inside and welded to the exterior (outer surface material) to be attached and reinforced to obtain strength and rigidity against external force. Even the contraction pad with a structure is lightweight and convenient to handle.

[0020]

According to the present invention, in the case of changing the blowing area of the air flow introduced into the test vehicle from the blowing nozzle of the environmental wind tunnel test device, in the case of changing the blowing area in the upward direction and the bilateral direction simultaneously, Since it can be realized by one blow nozzle and a small lightweight desorption type contraction pad without installing a device to replace it, the environmental wind tunnel is greatly reduced in size (the blow nozzle Installation space is reduced to about 1/3) and construction equipment costs can be significantly reduced.

[Brief description of drawings]

FIG. 1 is a partial side view of an embodiment of the present invention.

FIG. 2 is a detailed view of a blowing nozzle.

FIG. 3 is a detailed view of a contraction pad.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Wind tunnel part, 2 ... Wind tunnel blowing nozzle, 3 ... Test vehicle, 4 ... Rear deflector blades, 5 ... Wind tunnel suction duct, 6 ... Chassis roller,
7a to 7c ... Contraction pad, 8 ... Mounting bolt, 9 ... Handle.

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Tsuneyoshi Endo             1-1-20 Koyodai, Iruma-shi, Saitama Station Plaza             1-302

Claims (5)

[Claims] 1. An environmental wind tunnel test apparatus comprising blow-out nozzles formed of contraction plates on the upper and lower surfaces and both side surfaces, wherein the positions of the contraction plates on the lower surface and both side surfaces are fixed, and the contraction plates on the upper surface are arranged on both sides. An environmental wind tunnel test device characterized in that it is vertically movable between compression plates and that removable compression pads are attached inside the compression plates on both sides. 2. The environmental wind tunnel test apparatus according to claim 1, wherein the contraction plate on the upper surface has a structure in which the upstream end of the contraction plate is rotatably supported around a hinge. 3. An environmental wind tunnel test apparatus equipped with blow-out nozzles formed of contraction plates on the upper and lower surfaces and both side surfaces, wherein the positions of the contraction plates on the upper surface and the lower surface are fixed, and the contraction plates on both side surfaces are moved to the left and right. An environment wind tunnel test device having a movable structure, wherein a contraction pad is attached to the inside of the contraction plate on either or both of the upper surface and the lower surface. 4. An environmental air tunnel test apparatus blow-out nozzle comprising upper and lower surfaces and both side surfaces, wherein the lower surface and the both side surfaces are fixed in position, and the upper surface is connected to the both contracting plates. A blow-out nozzle characterized in that it is vertically movable between flow plates, and detachable compression pads are attached to the inside of the flow plates on both sides. 5. An environmental air tunnel test apparatus blow-out nozzle formed of upper and lower surfaces and both side surfaces of the contraction plate, the positions of the upper and lower contraction plates are fixed, and the both side contraction plates are moved left and right. An outlet nozzle having a flexible structure, wherein a contraction pad is attached to the inside of the contraction plate on either or both of the upper surface and the lower surface.