JPH08182791A - Air inflow amount adjusting mechanism at air intake port of wind tunnel apparatus - Google Patents

Abstract

PURPOSE: To uniformly and stably send air to an acting space by making the inflow amt. of air constant regardless of the presence of air to an air intake port. CONSTITUTION: An air inflow amt. adjusting mechanism is set to the air intake port formed to the outer peripheral wall of a free falling simulated experience apparatus. In this air inflow amt. adjusting mechanism, louver members 81 having a wing-shaped cross section are arranged so that each of them is supported in a shakable and revolvable manner at the position eccentric from its center of lift and energized to be shaken in the direction reverse to the shaking direction due to lift and opening the air intake port by a spring 85 and shaken in the direction reducing the opening area of the air intake port when air inflow speed is high corresponding to the change of air inflow speed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an air inflow adjusting mechanism at an air intake of a wind tunnel device for supplying air sucked from an intake by a blower to a working space at a predetermined wind speed.

[0002]

2. Description of the Related Art Conventionally, a wind tunnel device configured to supply air sucked from an intake by a blower to a working space at a predetermined wind speed has been used for various aerodynamic measurements and tests. Recently, such a wind tunnel device has been used for a simulated experience of free descent by a parachute.

Such a free-fall simulation experience device is configured to guide the air blown from the air blower so as to pass from the lower part of the working space (floating space) to the upper part thereof, and the wind speed of the airflow between humans and air during free fall. The relative velocity is set to be approximately equal to that of the practitioner so that the practitioner can float in the floating space by the buoyancy of the wind. As a result, it was possible to experience and practice the actual descent condition for a long time, and it became possible to acquire techniques that were not possible on the ground.

An example of such a wind tunnel device is shown in Japanese Patent Application No. 3-116883, which is provided in the blast circulation path 80 as shown in the conceptual diagram of FIG. An airflow circulates in the air circulation path 80 by the blower 81 (air blower), and a swimming area 83 (floating space) is provided at the rising air blowing portion. In the configuration shown in the figure, the bypass air passage 84 connects the diagonally lower side of the swimming area 83 and the circulation passage 80 on the upstream side, and the bypass air passage 84 is provided with a small blower 85. By driving, the wind through the bypass air passage 84 can flow into the swimming area 83 from diagonally below to generate a cross wind condition.

However, in the circulation type wind tunnel device which circulates the air in the circulation path as described above, there is a problem that the temperature of the circulating air rises due to the heat of the blower device, so that it is used as a wind tunnel device for a free-fall simulation experience. A non-circulating type wind tunnel device which does not have such a problem is suitable. As a non-circulating wind tunnel device for a free-fall simulation experience, an outer wall structure surrounds an internal structure that forms a floating space to form an air intake passage between the two, and the entire circumference of the outer wall structure is surrounded. An air intake is provided over the air, so that the air introduced from the air intake by the air blower provided under the floating space passes through the air intake passage from below to above the floating space and is then discharged. There is one configured in.

[0006]

By the way, in the wind tunnel device in which the air intake port is formed over the entire circumference of the outer wall structure as described above, the position of the air intake port when the wind blows on the outer side of the outer wall. Depending on the amount of air sucked, there arises a problem that air cannot be uniformly blown to the floating space. That is, a large amount of air flows in from the air intake that is a head wind as compared with the airless state, and the air intake located on the opposite side becomes a tailwind and the air inflow amount becomes smaller than that in the airless state. The intake passage is divided into multiple circumferential directions to prevent the flow of intake air in the circumferential direction.Therefore, if the amount of air inflow varies depending on the position of the air intake, the difference is introduced into the floating space as it is. Even in the same plane orthogonal to the direction, the amount of blown air changes (the wind speed differs) depending on the site. Furthermore, since the wind does not always blow uniformly, but the wind direction and wind speed also change irregularly, so the blast state in the floating space also changes correspondingly. Stable floating cannot be done in the state.

The influence of the wind on the air intake is not limited to the above-described free-fall simulation experience wind tunnel, but also occurs in general test / measurement wind tunnels. Even if the air intake is open in only one direction, the overall air speed will vary depending on the presence or absence of wind to the air intake, even if the amount of air blown at the part of the air flow cross section is uniform. This is a factor that causes an error in the data especially in the wind tunnel for measurement.

The present invention has been made in view of the above problems, and makes it possible to make the air inflow rate constant regardless of the presence or absence of wind to the air intake port, and to provide uniform and stable air blowing to the working space. It is an object of the present invention to provide an air inflow amount adjusting mechanism at an air intake of a wind tunnel device that enables the air inflow amount.

[0009]

In order to achieve the above object, an air inflow adjusting mechanism for an air intake of a wind tunnel device of the present invention has a louver member having a blade-shaped cross section at the center of its lift force at the air intake of the wind tunnel device. Is eccentrically supported in a swingable manner, and is arranged by being swingably biased by a swinging biasing means in a direction opposite to the swinging direction by the lift force and in a direction of opening the air intake port, When the air inflow speed is high corresponding to the change of the air inflow speed, the airflow is configured to swing in the direction of decreasing the opening area.

[0010]

In a calm and stable operating state, since air flows into the air intake at a constant flow velocity, the louver member is in a state where the lift force generated by the air flow and the urging force of the swing urging means are balanced. And maintain a constant opening area. On the other hand, when the air inflow velocity to the air intake is changed by the wind, the lift force acting on the louver member is changed accordingly, the balance with the urging force of the swing urging member is lost, and the louver member is moved to the balanced position. The opening area changes by rocking.

That is, when the air inflow velocity to the air intake is increased by the head wind, the lift force acting on the louver member increases, so that the louver member closes the air intake against the urging force of the swing urging member. It swings in the direction to reduce the opening area, thereby restricting the inflow of air. Further, when the air inflow speed to the air intake becomes slow in the tail wind condition, the lift force acting on the louver member becomes small, so that the louver member swings in the direction to open the air intake by the biasing force of the swing biasing member. To increase the opening area, thereby promoting the inflow of air. Therefore, the opening area decreases when the headwind is high and the opening area is large when the tailwind is low, so that the airflow rate per unit time is always constant. To work.

[0012]

Embodiments of the present invention will be described below with reference to the accompanying drawings.

FIG. 1 is an external perspective view of a free descent simulation experience device to which an embodiment of an air inflow amount adjusting mechanism at an air intake of a wind tunnel device according to the present invention is applied, and FIG. 2 is a longitudinal sectional view thereof.
3 is a sectional view taken along line AA of FIG. 2, FIG. 4 is a sectional view taken along line BB of FIG. 2, and FIG. 5 is a sectional view taken along line CC of FIG.

The illustrated free descent simulation experience device is an octagonal column having a predetermined height as a whole, and the lower end portion thereof is installed by being buried in the ground at a predetermined depth. An octagonal columnar internal structure 20 similar to the external shape is provided in the center of the interior, and an outer surface 21 of the internal structure 20 and an outer wall 1 which is an outer wall structure.
A space having a predetermined width is formed between the inner surface of 0 and the inner surface of 0 to surround the entire circumference except the upper end portion, and this constitutes the intake passage 30. It should be noted that the present embodiment is an example in which the device is configured in an octagonal prism shape, but the invention is not limited to this, and other polygonal prisms or cylinders may be used and can be appropriately changed.

An exhaust port 11 is formed on the outer wall 10 at the uppermost portion adjacent to the top surface over the entire circumference except for the octagonal apex, and an air intake is located slightly above the center in the height direction. An opening 12 is formed over the entire circumference except for the apex of the octagon. The air intake 12 has a rectangular opening on each surface of an octagonal prism, and the air intake 12 is provided with an air inflow equalization mechanism 80, which will be described in detail later.

The intake passage 30 is formed with a donut-shaped intake passage space 31 which is continuous in the circumferential direction at the position where the air intake is formed, and its lower side connects the outer wall 10 and the octagonal apex of the internal structure 20. It is partitioned by the partition plate 32 provided in (4) and is divided into eight intake passage sections 33 in the circumferential direction. A silencer 34 is provided at an opening portion of each intake passage section 33 to the intake passage space 31.

An outer surface 21 of the internal structure 20 constitutes an inner surface of the intake passage 30, and a swimming chamber 23 as a floating space surrounded by a peripheral wall 22 in an octagonal shape similar to the outer shape is formed in the center of the inside. Between the swimming room 23 and the outer surface 21, there is provided a corridor section 24 that extends around the swimming room 23 on the same plane as the floor surface of the swimming room 23. Further, a corridor portion is not provided between the predetermined one surface of the octagon and the corresponding intake passage section 32, and is closed, and the gust duct 40 that connects the swimming chamber 23 and the intake passage section 32 is provided here. Has been formed. The swimming room 23 can be accessed through a corridor 24 through a door (not shown) provided on the peripheral wall 22, and the corridor 24 is provided with an entrance 13 (see FIG. (Shown in FIG. 1) can be accessed from the outside through a passage (not shown) leading to the outside.

The swimming room 23 has a floor surface and a ceiling surface which are opened to have a predetermined diameter and is connected to the lower air passage 50 or the upper air passage 60, respectively. Further, the gust duct 40 described above is opened on one surface of the peripheral wall 22.

The lower air passage 50 is vertically extended below the swimming chamber 23 and is connected to all the intake passage sections 33 via the side passage space 51 along the bottom of the free-fall simulation experience device. An axial-flow type blower 52 as a blower is arranged at the connecting portion so that the blowing direction is the upper side (the swimming room 23 side). Between the blower 52 and the swimming room 23,
A rectifying honeycomb 53, mixed-flow / fluctuation-wind generating blades 54, and a speed change louver 55 are provided, and a fall prevention net 56 is doubly stretched at the opening to the swimming chamber 23.

The upper air passage 60 extends vertically upward, and is connected to an exhaust space 61 which is horizontally formed at the site where the exhaust port 11 is formed and along the top surface of the free fall simulating experience device. A suction prevention net 62 is stretched over the opening to the swimming chamber 23. In addition, reference numeral 63 in the drawing denotes a silencer provided in the upper air passage 60.

In the free fall simulating experience device constructed as described above, the air sucked from the air intake 12 through the intake passage 30 by the drive of the blower 52 is moved to the lower blower passage 5.
Blow up into the swimming chamber 23 from 0, pass through the swimming chamber 23, pass through the upper ventilation passage 60, exhaust space 61, and exhaust port 11
Is discharged from the outside. The air blown up into the swimming chamber 23 is rectified and controlled by the rectifying honeycomb 53 and the mixed flow / fluctuation airflow generation vanes 54, and is made stable without turbulence. The flow velocity in the swimming room 23 is set to be approximately 70 m / sec, which is approximately equal to the relative velocity with the air during free fall, whereby the swimmer located in the ascending airstream does not fall or rise. You can experience the free-falling state in a floating state.

Here, the air intake equalizing mechanism 80 is provided at the air inlet 12 formed in the outer wall as described above.

In the air inflow equalization mechanism 80, as shown in a partially enlarged perspective view of FIG. 6, louver members 81 having a length substantially equal to the width of the air inlet 12 are vertically arranged at predetermined intervals. Are arranged in a plurality of rows over the entire height direction.

The louver member 81 is formed in a so-called airfoil cross section in which the curvature of the upper surface is smaller than the curvature of the lower surface, and fulcrum shafts 82 projectingly formed at both ends in the longitudinal direction are provided on the frame plate 83 of the opening through a bearing member (not shown). It is fitted so that it can swing and rotate freely, and is provided with its front end face facing outward. That is, it is swingably and rotatably supported by the frame plate 83, and as shown in FIG. 7, the position of the support shaft 82 (swinging center position) is located from the lift center position 84 of the louver member 81. It is set eccentrically behind the fixed amount. Further, the relationship (interval) between the cross-sectional shape (width and thickness) and the disposition positions of the vertically adjacent ones is as shown in FIG. When viewed from the front, the rear end overlaps with the front end portion of the louver member 81 adjacent to the lower side by a predetermined amount, and there is a predetermined gap between them.

The fulcrum shaft portion 82 protruding to the outside of the frame plate 83 has an outer peripheral side end portion fixed to the frame plate 83.
The inner peripheral side end of the louver member 5 is fixed, and the louver member 81 is urged to oscillate in a direction with its front end facing downward (clockwise direction in FIGS. 6 and 7) by the elastic restoring force of the spiral spring 85. At the same time, the swing is restricted by a stopper (not shown) so that the stopper is substantially horizontal.

The louver member 81 thus constructed
Is lifted by the airflow when the air flows into the air intake 12, and the lift center 84 and the support shaft 82 (swing center) are eccentric, so that the lift center 84 is upward about the support shaft 82. Direction (direction with the front end upward)
The swing force due to the lift force stops at a position balanced with the urging force of the main spring 82. That is, since the air inflow velocity is constant when the free-fall simulation experience device is operating stably, the louver member 81 also stably maintains a constant posture when the outside is in a windless state. In this embodiment, at this time, the front end is set to be slightly upward from the horizontal state, and this state is the state shown by the broken lines in FIGS. 7 and 8. When there is wind on the outside and it is a headwind, the wind velocity is added to the air inflow velocity in a no-wind state to increase the air inflow velocity, and as a result, the lift force acting on the louver member 81 increases and the mainspring spring As shown in FIG. 8, it swings in the direction in which the front end is upward (counterclockwise in the figure) against the biasing force of 85. When the external wind is the tail wind, the air inflow velocity becomes slower, so that the lift decreases and the front end is swung downward. That is, the louver member 81 oscillates in accordance with the air inflow velocity, and as a result, when viewed as the air inflow amount equalizing mechanism 80 as a whole, the overlapping amount of the louver members 81 that are vertically adjacent to each other and the gap (opening) between them. By changing the area and the intake resistance, the inflow amount of air is regulated.

The inclination of the louver member 81 depending on the air inflow speed depends on its sectional shape (lift force generated by the sectional shape), the eccentric amount of the lift center 84 and the support shaft 82 (swing center), and the biasing force of the main spring 85. The overlapping amount of the louver members 81 adjacent to each other in the vertical direction and the gap (opening area and intake resistance) generated between the louver members 81 are determined by the cross-sectional shape of the louver member 81 and the arrangement interval of the adjacent louver members 81. The condition is an air inflow equalization mechanism 8
In the whole 0, the amount of inflow of air into the air intake 12 per unit time is set to be always constant regardless of the change of the air inflow speed.

In the air inflow equalization mechanism 80 having the louver member 81 as described above, the louver is constant because the air inflow rate is constant when the free-fall simulation experience device is in stable operation and there is no wind outside. The member 81 is stable in a posture in which the front end is slightly upward as compared with the horizontal state, and maintains a state where the opening ratio is large and the intake resistance is small. On the other hand, the air intake 1
In a situation where the wind blows toward 2, the louver member 81 is closed because the air inflow velocity is high (the front end is swung upward and overlaps with the adjacent one), and the opening area is reduced and the intake air is reduced. The resistance increases, and the amount of inflow of air per unit time becomes equal to that in the above-described windless state. Further, in a situation where the tail wind blows and the air intake 12 site becomes a negative pressure, the louver member 81 opens due to the slow air inflow speed (swings more horizontally than in the no wind state), and in the no wind state. As the opening area further increases and the intake resistance decreases, a large amount of air can be sucked in, and the amount of air inflow per unit time becomes equal to that in the above-mentioned no-air state. In this way, even if there is wind outside, it works so that the air inflow rate is always constant.

Thus, in the free fall simulating experience device having the air inflow equalization mechanism 80 having the above-mentioned structure at the air intake 12, when the blower 52 is driven to blow the air into the swimming room 23, the wind is blown outside. Even if there is, the same amount of air is taken in from any of the air intakes 12 arranged in the outer wall 10, so the amount of air blown to the swimming room 23 is the amount of air blown ( There is no difference in wind speed). That is, at the time of blowing air, air is sucked from the intake passage space 31 through the lower air passage 50 and each intake passage section 33, and air is sucked into the intake passage space 31 from the outside through the air intake 12. Even if there is wind on the outside, the air inflow equalization mechanism 80 always regulates the air inflow amount to a constant amount per unit time, so that an equal amount of air is supplied from any of the air intake ports 12 arranged in the outer wall 10. The air is sucked into the intake passage space 31, and as a result, the same amount of air is also sucked into each of the intake passage sections 33, so that the amount of air blown is uniform at any part in the same plane orthogonal to the air blow direction. is there. As a result, the blowing of air to the swimming room 23 becomes stable, and a safe free fall simulation experience is possible.

In addition to the function of the air inflow amount equalizing mechanism 80, in this structure, the intake air from each air intake 12 is not directly guided to the intake passage section 33, but is temporarily introduced into the intake passage space 31 continuous in the circumferential direction. After being introduced, this intake passage space 31
The air intake amount into each intake passage section 33 is increased by the intake passage space 31 having a larger volume than the air flow rate (volume) to the swimming chamber 23. Is further promoted to further stabilize the air flow.

In the above embodiment, when the swing center (support shaft 82) of the louver member 81 of the air inflow equalization mechanism 80 is eccentrically rearward from the lift center position 84 by a predetermined amount of lift, the front end side is moved. Although the louver member 81 is configured to swing upward, the swing center of the louver member 81 may be eccentric to the front side of the lift center position so that the front end side swings downward when lift is applied. It is a thing. Further, the swinging urging means is not limited to the mainspring 85, but can be changed as appropriate such as urging the louver member 81 with a coil spring 86 as shown in FIG.

Further, the present embodiment applies the present invention to the air intake 1.
No. 2 is applied to the air intake of the free fall simulation experience device arranged around, but the present invention is not limited to this, and a general test / measurement in which the air intake is opened in only one direction. It may be applied to the air intake of a wind tunnel for use, and by doing so, it is possible to prevent changes in the air intake rate and changes in the wind speed due to the effect of external wind, and to carry out experiments at any time regardless of the external wind conditions.・ Measurement becomes possible and highly accurate measurement data can be obtained.

By the way, in this embodiment, the lower air duct 50
The rectifier honeycomb 53 is provided on the upstream side in the blowing direction with a rapid velocity change louver 56 capable of opening and closing the lower air passage 50, and on the upstream side there is a rapid velocity change bypass duct 70 opened and closed by the door members 72 and 73. Connected,
The louver 56 for sudden speed change provided in the lower air passage 50 is closed, and the door member 7 of the bypass duct 70 for sudden speed change is closed.
By opening 2, 73, it becomes possible to interrupt the blowing of air into the swimming room 32 without stopping the driving of the blower 52 and allow the swimmer to experience the state of opening the umbrella from the free-fall state. There is. In this case, the swimmer 1 needs to tie the suspension line 2 to the upper part of the swimming room. That is, by closing the louver 56 for sudden change in speed and simultaneously opening the door members 72, 73 provided at the opening of the bypass duct 70 for sudden change in speed from the above-described normal free-fall simulation experience state, the swimming room 23 is opened. The lower air passage 50 that communicates with the louver 56 for sudden speed change is blocked to prevent air from being blown into the swimming chamber 23, and the air is circulated to the intake passage 30 through the bypass duct 70 for sudden speed change. As a result, the buoyancy generated by the air blow causes the swimmer 1 who was in a floating state in the swimming chamber 23 to fall until being suspended and supported by the hanging rope 2 because the buoyancy is lost. In this way, the state in which the fall is blocked by the hanging rope 2 is just the same as the state in which the umbrella is opened from the free fall at the time of the actual descent, and the umbrella open state can be simulated. The air blown from the blower 52 whose passage (lower air passage 50) to the swimming chamber 23 is blocked by the sudden speed change louver 56 is recirculated to the intake passage 30 through the rapid speed change bypass duct 70 as described above. The introduction of new air from the air intake port 12 is stopped, and the ventilation is continued, so that the blower 52 is not overloaded.

The swimming chamber 23 and the intake passage 30 described above are also provided.
In the intake passage section 33A, to which the gust duct 40 that communicates with the (intake passage section 32) is connected, the silencer 34 disposed above the opening of the gust duct 40 (upstream side in the intake direction).
An intake passage shutter 35 that can open and close the intake passage section 32 is provided on the upstream side of the
The gust duct shutter 4 that can be opened and closed at both openings on the side of the swimming chamber 23 and the side of the intake passage 33A.
1, 42 are provided, and the intake passage shutter 3
5 and by opening and closing the gust duct shutters 41 and 42, it is possible to create a crosswind condition in the swimming room 32, and to experience the situation of being crosswind-induced during free descent. There is. That is, the intake passage shutter 3 provided in the intake passage section 33 to which the gust duct 40 is connected.
5 is closed, and at the same time, the gust duct shutters 41 and 42 provided in the gust duct 40 are opened to prevent intake from the intake passage section 33A and to swim downstream of the intake passage shutter 35 in the intake passage section 33. The chamber 23 communicates with the gust duct 40 to allow ventilation, and air flows from the swimming chamber 23 to the intake passage section 33A via the gust duct 40 to allow the gust duct 4 to flow from the swimming chamber 23.
0, the intake passage section 33A, the side passage space 51 and the lower air passage 50 (blower 52) circulate, and a cross wind in the direction toward the gust duct 40 is generated in the swimming chamber 23 to allow free fall. This makes it possible to practice the response when a crosswind is received.

In other words, according to the configuration of this embodiment, it is possible to learn complicated and advanced techniques on the ground.

[0036]

As described above, according to the air inflow adjusting mechanism at the air intake of the wind tunnel device according to the present invention,
The louver member provided at the air intake oscillates in response to changes in the air inflow speed, reducing the opening area when the air inflow speed is high and increasing the opening area when the air inflow speed is low. Since the air inflow rate per unit time is always constant, it is possible to always maintain a constant air flow to the working space regardless of the presence or absence of fluctuations in the air intake,
It is possible to blow air uniformly and stably.

[Brief description of drawings]

FIG. 1 is an external perspective view of a free descent simulation experience device to which an embodiment of an air inflow amount adjusting mechanism at an air intake of a wind tunnel device according to the present invention is applied.

FIG. 2 is a vertical sectional view thereof.

FIG. 3 is a sectional view taken along line AA of FIG. 2;

FIG. 4 is a sectional view taken along line BB of FIG.

5 is a sectional view taken along line CC of FIG.

FIG. 6 is a partially enlarged perspective view of an air inflow equalization mechanism.

FIG. 7 is a cross-sectional view of a louver member.

FIG. 8 is a cross-sectional view showing an operating state of the louver member when the air inflow amount is increased.

FIG. 9 is a partially enlarged perspective view of an air inflow equalization mechanism in which the swing urging means has another configuration.

FIG. 10 is a conceptual diagram showing a conventional example.

[Explanation of symbols]

 12 air intake 80 air inflow amount adjusting mechanism 81 louver member 85 spring spring (oscillating urging means) 86 coil spring (oscillating urging means)

Claims (1)

[Claims] 1. A louver member having an airfoil cross section is swingably and rotatably supported at a position eccentric from a center of its lift force at an air intake port of a wind tunnel device, and a swinging direction by the lift force by a swing biasing means. Opposite to the above, they are arranged so as to be oscillated and urged in a direction to open the air intake, and oscillate in a direction to reduce the opening area when the air inflow speed is high corresponding to the change in the air inflow speed. An air inflow adjustment mechanism at an air intake of a wind tunnel device.