JP2021117170A - Wind tunnel device - Google Patents

Abstract

To provide a wind tunnel device capable of reproducing longitudinal vortex.SOLUTION: A lifting device comprises: a measuring unit on which a test piece is placed; a blowing unit for blowing an air flow to the measuring unit; an adjusting unit which is provided upstream of the measuring unit in a flowing direction of the air flow for adjusting the air flow; a blade unit provided on a floor part of the adjusting unit; and a state change unit for changing a state of the blade unit with respect to the air flow. The blade unit is formed in a shape of a triangular plate having an inclination edge which extends while being inclined upward and to the downstream side of the flow direction of the air flow from the floor part, and is disposed with an angle of attack with respect to the flow direction of the air flow when seen from an upper side of the floor part. The state change unit changes an amount of protrusion of the blade unit from the floor part.SELECTED DRAWING: Figure 2

Description

The present disclosure relates to a wind tunnel device.

Conventionally, a plurality of spiders (small fins) have been erected near the outlet of the wind tunnel (on the entrance side of the measuring part) at intervals in the direction orthogonal to the flow of the wind, and the plurality of spires extend in the vertical direction. A wind tunnel device that generates turbulence by swinging left and right around a rotation axis is known.

Japanese Unexamined Patent Publication No. 5-187959 Japanese Unexamined Patent Publication No. 8-313389

By the way, when the vehicle is traveling, it is affected by the air flow generated by the preceding vehicle traveling in front of the own vehicle. The airflow generated by the vehicle in front forms a vertical vortex that swirls around an axis extending rearward from the vehicle in front. The own vehicle (the following vehicle of the preceding vehicle) is affected by this vertical vortex, but the wind tunnel device disclosed in Patent Document 1 and Patent Document 2 described above cannot reproduce this vertical vortex.

In view of the above circumstances, it is an object of the present invention to provide a wind tunnel device capable of reproducing a vertical vortex.

The wind tunnel device according to some embodiments is provided with a measuring unit in which a test piece is arranged, a blowing unit that blows airflow to the measuring unit, and an airflow upstream side of the measuring unit in the flow direction of the airflow. The wing portion includes an adjusting portion for adjustment, a wing portion provided on the floor portion of the adjusting portion, and a state changing portion for changing the state of the wing portion with respect to the air flow. It is formed in the shape of a triangular plate having an inclined edge extending downstream and upward in the flow direction, and is arranged at an angle of attack with respect to the flow direction of the air flow when viewed from above the floor portion. The state changing portion changes the amount of protrusion of the wing portion from the floor portion.

According to the above configuration, due to the angle of attack of the wing portion, the airflow that collides with one surface of the wing portion facing the upstream side goes around the other surface of the wing portion beyond the inclined edge. When this airflow wraps around, a rotating component is added to the airflow to form a vortex, and a vertical vortex is generated. Then, by changing the amount of protrusion of the wing from the floor, the scale (size) of the vertical vortex is changed, so that a vertical vortex similar to the vertical vortex generated by the traveling of the preceding vehicle can be reproduced.

In one embodiment, in the above configuration, the floor portion is provided with a through hole, the wing portion passes through the through hole and protrudes from the floor portion, and the state changing portion raises and lowers the wing portion. By moving the wing portion, the amount of protrusion from the floor portion is changed.

According to the above configuration, the amount of protrusion of the wing from the floor is changed by moving the wing up and down. Therefore, the amount of protrusion of the wing can be easily changed without replacing the wing with a wing having a different amount of protrusion from the floor.

In one embodiment, in the above configuration, the edge of the wing on the downstream side of the airflow in the flow direction is perpendicular to the floor.

According to the above configuration, the position of the edge portion on the downstream side in the flow direction of the airflow of the wing portion does not change even if the amount of protrusion of the wing portion from the floor portion is changed by moving the wing portion up and down. Therefore, even if the amount of protrusion of the wing portion from the floor portion is changed, the position of the airflow direction of the edge portion on the downstream side in the flow direction of the airflow portion of the wing portion can be maintained. As a result, the positional relationship between the test piece and the edge on the downstream side of the airflow direction of the wing becomes constant, and the effect of the vertical vortex when the distance between the vehicle in front and the own vehicle is kept constant is analyzed. can.

In one embodiment, in the above configuration, the state changing unit can change the angle of attack.

According to the above configuration, the wind tunnel test can be performed by changing the size and strength of the vertical vortex by changing the amount of protrusion of the wing from the floor and the angle of attack of the wing with respect to the flow direction of the air flow.

In one embodiment, in the above configuration, the state changing portion is provided with the tubular portion extending in the vertical direction and the upper end of the tubular portion to form a part of the floor portion and the through hole. A lid portion, a rotating portion that rotates the tubular portion, a base portion that extends downward from the wing portion, is housed inside the tubular portion, and is vertically attached to the tubular portion, and the tubular portion. It is provided with an elevating part that is housed inside and moves the base part up and down.

According to the above configuration, the angle of attack of the wing with respect to the airflow direction and the amount of protrusion of the wing from the floor can be changed independently, so that the amount of protrusion is changed while changing the angle of attack. be able to.

In one embodiment, in the above configuration, a plurality of the wing portions are provided in a direction intersecting the flow direction of the air flow, and the state changing portions independently change the states of the plurality of the wing portions with respect to the air flow. change.

According to the above configuration, the number and position of the vertical vortices to be generated can be arbitrarily changed, and the size and strength of the vertical vortices to be generated can be arbitrarily changed. As a result, the wind tunnel test can be performed by changing the number and position of the vertical vortices and the size and strength of the vertical vortices.

According to the present invention, a vertical vortex can be reproduced.

It is a top view which shows typically the wind tunnel device. It is a perspective view which shows the main part of the wind tunnel device schematicly. It is a top view which shows typically the wind tunnel device. It is a perspective view which shows the structure of the state change part schematicly.

Hereinafter, embodiments will be described with reference to the accompanying drawings. However, the dimensions, materials, shapes, relative arrangements, etc. of the components described as embodiments or shown in the drawings are not intended to limit the scope of the present invention to this, and are merely explanatory examples. do not have.

As shown in FIG. 1, the wind tunnel device 1 is a device capable of measuring and evaluating the aerodynamic performance of a test body, that is, a vehicle VC in the present embodiment, and can reproduce, for example, an air flow in a vehicle traveling state. The wind tunnel device 1 has a measuring unit 22 in which a vehicle VC is arranged and measures and evaluates its aerodynamic performance, a blower unit (blower 23) that blows airflow to the measuring unit 22, and a measuring unit 22 in the flow direction F of the airflow. Upstream, an adjusting unit 21 for adjusting the airflow flowing into the measuring unit 22 is provided. The adjusting unit 21 adjusts the air flow introduced into the measuring unit 22 by providing fins or narrowing the flow path area of the air passage. The adjusting portion 21 is provided with a wing portion (delta wing 11). The delta blade 11 controls the airflow supplied to the vehicle VC, and is provided on the floor portion 21a of the adjusting portion 21. Further, the wind tunnel device 2 is provided with a state changing unit 12 for changing the state (posture) of the delta blade 11 with respect to the air flow.

As shown in FIG. 2, the delta blade 11 is formed in the shape of a triangular plate protruding upward from the floor portion 21a. In the present embodiment, the delta blade 11 is formed in a right triangle, and the edge on the upstream side of the flow direction F of the airflow is the inclined edge 11a extending downstream and upward from the floor portion 21a, and the flow direction F of the airflow F. The downstream edge is a vertical edge 11b extending perpendicularly to the floor portion 21a from the downstream end of the inclined edge 11a. That is, the delta blade 11 projects from the floor portion 21a in a right-angled triangular shape in which the inclined edge 11a faces the upstream side in the flow direction F of the air flow. In the present embodiment, the delta blade 11 is a blade having a uniform thickness formed by smooth surfaces on both sides thereof, and the inclined edge 11a extends in a straight line. Further, as shown in FIG. 3, the delta blade 11 is arranged so as to have an angle of attack α with respect to the flow direction F of the air flow when viewed from the vertical direction (direction perpendicular to the floor portion 21a).

As described above, the vertical vortex LV is generated by arranging the delta blade 11 so that the inclined edge 11a faces the upstream side of the airflow direction F and has an angle of attack α with respect to the airflow direction F. Can be done. This is because the delta blade 11 is provided with an angle of attack α so that the airflow that collides with one surface of the delta blade 11 facing upstream in the flow direction F of the airflow exceeds the inclined edge 11a and is the other of the delta blade 11. This is because a rotational component is added to the airflow when it goes around the surface, and a vertical vortex LV is generated. The vertical vortex LV is a vortex centered on the axis AX toward the flow direction F of the air flow.

The shape of the delta blade 11 is not limited to this, and may be any shape that can control the vertical vortex LV as described later while generating the vertical vortex LV. For example, in the present embodiment, the angle formed by the inclined edge 11a of the delta blade 11 and the floor portion 21a is 30 degrees, but the angle of the inclined edge 11a is not limited to this. Further, the inclined edge 11a may be curved instead of extending in a straight line, but when controlling the vertical vortex LV as described later, it is preferable that the inclined edge 11a extends in a straight line. Further, in the present embodiment, the delta blade 11 projects perpendicularly to the floor portion 21a, but the delta blade 11 may project at an angle with respect to the floor portion.

As shown in FIG. 4, the state changing unit 12 has a function of changing the amount of protrusion of the delta blade 11. In the present embodiment, the state changing portion 12 includes an elevating device 13 for moving the delta blade 11 up and down from under the floor to above the floor of the floor portion 21a, and the amount of protrusion of the delta wing 11 from the floor portion 21a is arbitrarily adjusted by this elevating movement. It is possible. The floor portion 21a is provided with a rectangular through hole 21a1 into which the delta blade 11 is inserted, and the delta blade 11 can move up and down through the through hole 21a1. The size of the through hole 21a1 is provided according to the length on the floor portion 21a of the delta blade 11 when the delta blade 11 is most projected. A windshield member 14 that closes the gap between the through hole 21a1 and the delta blade 11 is provided at the edge of the through hole 21a1. The windshield member 14 is an elastically deformable member such as a rubber sheet, which closes the gap between the through hole 21a1 and the delta blade 11 that expands when the delta blade 11 descends, and affects the air flow. I'm reducing it.

The state changing portion 12 closes the vertically extending hollow tubular portion 15 housed under the floor of the floor portion 21a and the upper end of the tubular portion 15 and forms a part of the floor portion 21a, and the through hole 21a1 is formed. It has a lid portion 16 provided, and the elevating device 13 is housed in the tubular portion 15.

The elevating device 13 has a base 131 extending downward from the lower end of the delta blade 11 and an elevating portion 132 for raising and lowering the base 131. In the present embodiment, the base portion 131 has an extension portion 131a formed of a delta blade 11 and a single plate, and a connection plate portion 131b connected to the extension portion 131a and extending downward. The connecting plate portion 131b is provided with an elongated hole H, and is attached to the tubular portion 15 so as to be able to move up and down by a bolt B or the like passing through the elongated hole H. Further, in the present embodiment, the elevating part 132 can move up and down the connection plate part 131b by a power source M such as a motor, and specifically, the gear G rotated by the power source M meshes with the connection plate part 131b. The connection plate portion 131b is raised and lowered by the above.

Further, the state changing unit 12 can also change the angle of attack α of the delta blade 11. In the present embodiment, the bottom of the tubular portion 15 is provided with a rotating portion 17 that rotates the tubular portion 15 around an axis extending in the vertical direction, and the angle of attack α is changed by rotating the tubular portion 15. There is. In this way, the state changing unit 12 controls the vertical vortex LV generated by the delta blade 11 by changing the state (posture) of the delta blade 11 with respect to the air flow such as the protrusion amount and the angle of attack α. Specifically, the size of the vertical vortex LV can be increased by increasing the amount of protrusion of the delta blade 11 from the floor portion 21a, and the vertical vortex LV can be increased by increasing the angle of attack α of the delta blade 11. The size and strength can be increased. The size of the angle of attack α of the delta blade 11 is set to an angle having the strength desired by the user within the range in which the vertical vortex LV is generated.

The state changing unit 12 is not limited to this, and for example, the protrusion amount and the angle of attack α of the delta blade 11 may be changed by human power, or delta blades having a plurality of shapes are prepared in advance and used. The protrusion amount and the angle of attack α of the delta blade 11 may be changed by replacing the blades 11. Further, the protrusion amount of the delta blade 11 may include zero (the delta blade 11 is completely hidden under the floor of the floor portion 21a), and the angle of attack α includes zero (the delta blade 11 is parallel to the flow direction F of the air flow). But it may be. When either the protrusion amount of the delta blade 11 or the angle of attack α becomes zero, the vertical vortex LV does not occur.

According to the wind tunnel device 1 according to the above-described embodiment, the state changing portion 12 can change the amount of protrusion of the delta blade 11 from the floor portion 21a, so that the magnitude of the vertical vortex LV generated by the delta blade 11 can be controlled. Can be done. As a result, vertical vortex LVs of various sizes can be reproduced, and the influence of the vertical vortex LV on the test piece and its surroundings can be tested.

According to the wind tunnel device 1 according to the above-described embodiment, the amount of protrusion of the delta blade 11 from the floor portion 21a is changed by moving the delta blade 11 up and down. Therefore, the protrusion amount of the delta blade 11 can be easily changed without replacing the delta blade 11 with the delta blade 11 having a different protrusion amount from the floor portion 21a. Further, it is possible to finely adjust the amount of protrusion of the delta blade 11 from the floor portion 21a.

According to the wind tunnel device 1 according to the above-described embodiment, since the edge (vertical edge 11b) on the downstream side of the air flow direction F of the delta blade 11 is perpendicular to the floor portion 21a, the delta blade 11 is moved up and down. The position of the vertical edge 11b of the delta blade 11 does not change even if the amount of protrusion of the delta blade 11 from the floor portion 21a is changed. Therefore, even if the amount of protrusion of the delta blade 11 from the floor portion 21a is changed, the position of the vertical edge 11b of the delta blade 11 in the flow direction can be maintained at the same position. As a result, the positional relationship between the vertical edge 11b of the delta blade 11 and the test pair becomes constant, and the influence of the vertical vortex LV can be analyzed while the distance between the vehicle in front and the own vehicle is kept constant. As a result, the vertical vortex LV supplied to the test piece can be controlled more accurately.

According to the wind tunnel device 1 according to the above-described embodiment, since the state changing unit 12 can also change the angle of attack α of the delta blade 11, the vertical vortex LV can be adjusted by adjusting the protrusion amount and the angle of attack α of the delta blade 11. Can be controlled, and a wider variety of vertical vortex LVs can be generated.

According to the wind tunnel device 1 according to the above-described embodiment, since the elevating device 13 is attached to the inside of the tubular portion 15 and the rotating portion 17 for rotating the tubular portion 15 is provided, the delta blade 11 is moved up and down. The angle of attack α can be changed.

A plurality of the above-mentioned delta blades 11 may be provided in a direction intersecting the flow direction F of the air flow. In this case, it is preferable that the plurality of delta blades 11 can independently change the protrusion amount and the angle of attack α. In this way, the number and position of the vertical vortex LV to be generated can be arbitrarily changed, and the size and strength of the vertical vortex LV to be generated can be arbitrarily changed. As a result, the wind tunnel test can be performed by changing the number and position of the vertical vortex LV and the size and strength of the vertical vortex in various ways.

The present invention is not limited to the above-described embodiment, and includes a modified form of the above-described embodiment and a combination of these embodiments as appropriate.

1 Wind tunnel device 11 Wing (delta wing)
11a Inclined edge 11b Vertical edge 12 State change part 13 Lifting device 14 Wind shield member 17 Rotating part 21 Adjusting part 21a Floor 21a1 Through hole 22 Measuring part 23 Blower α Angle of attack LV Vertical vortex AX Axis VC test piece (vehicle)

Claims (6)

The measuring unit where the test piece is placed and
An airflow unit that blows airflow to the measurement unit,
An adjusting unit provided on the upstream side of the measuring unit in the flow direction of the air flow and adjusting the air flow,
The wing portion provided on the floor portion of the adjustment portion and
A state changing portion for changing the state of the wing portion with respect to the air flow is provided.
The wing portion is formed in the shape of a triangular plate having an inclined edge extending downstream and upward in the flow direction of the airflow from the floor, and the flow direction of the airflow when viewed from above the floor. It is arranged with an angle of attack against
The state changing portion changes the amount of protrusion of the wing portion from the floor portion.
Wind tunnel device. A through hole is provided in the floor portion, and a through hole is provided.
The wing portion passes through the through hole and protrudes from the floor portion.
The state changing portion changes the amount of protrusion of the wing portion from the floor portion by moving the wing portion up and down.
The wind tunnel device according to claim 1. The edge of the wing on the downstream side in the flow direction of the airflow is perpendicular to the floor.
The wind tunnel device according to claim 2. The state changing unit can change the angle of attack.
The wind tunnel device according to any one of claims 1 to 3. The state change part
A tubular part that extends in the vertical direction and
A lid portion that closes the upper end of the tubular portion to form a part of the floor portion and is provided with the through hole, and a lid portion.
A rotating part that rotates the tubular part and
A base portion that extends downward from the wing portion, is housed inside the tubular portion, and is attached to the tubular portion so as to be able to move up and down.
It is provided with an elevating portion housed inside the tubular portion and elevating and moving the base portion.
The wind tunnel device according to claim 2 or 3. A plurality of the wing portions are provided in a direction intersecting the flow direction of the air flow.
The state changing portion independently changes the states of the plurality of the wing portions with respect to the air flow.
The wind tunnel device according to any one of claims 1 to 5.

Images