JPH09329524A - Wind tunnel experimenting apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a compact wind tunnel experimenting apparatus capable of effective utilization of a limited space with higher accuracy by employing a sirocco fan as a blower to reduce the length in the direction of current of a rectifying shell with larger angle of diffusion of a diffusing shell. SOLUTION: The sirocco fan is employed as a blower 3 to be driven by a motor 2 while an angle of diffusion of a diffusing shell 4 is set larger, for example, to about 60 deg.. This enables remarkably reducing of the overall length of a wind tunnel 1 coupled with a lessened length in the direction of current of the blower 3 itself. This enables the producing of a compact multi-functional wind tunnel experimenting apparatus of an indoor circulation type utilizing a narrow space, which can secure a sufficient accuracy even with limited throttling ratio.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wind tunnel experimental apparatus for testing and measuring wind resistance stability of large structures such as high-rise buildings and bridges, and more specifically, to effectively utilize a limited space. It is intended to provide a multi-function wind tunnel test device capable of various experiments and measurements with a compact configuration to be obtained.

[0002]

2. Description of the Related Art Göttingen type and Eiffel type wind tunnels are known as wind tunnels of this type. The former is a type in which the air passage is in a closed loop shape and the air flow circulates, whereas the latter is a type in which the air flow inlet to the air passage and the discharge outlet downstream of the measuring cylinder are open. It is common to adopt the indoor recirculation method to avoid the influence of atmospheric fluctuations.

[0003]

SUMMARY OF THE INVENTION The main object of the present invention is to focus on static and dynamic external forces caused by fluids such as air and water among the external forces acting on a structure. Of experimental equipment for simulating various characteristics of fluids, interaction between fluid force and response behavior of structures, new hydrodynamic phenomena associated with diversification of structures, etc. It is to provide a multi-function wind tunnel experiment device equipped with. Further, for this reason, it is an object of the present invention to provide a compact wind tunnel experiment device which has high accuracy and can effectively utilize a limited space.

[0004]

In order to achieve the above object, the invention of claim 1 adopts a sirocco fan as a blower and increases the diffusion angle of the diffusion cylinder to increase the length in the air flow direction of the rectifying cylinder. It is a shortened one. This allows
We have realized a compact indoor circulation type wind tunnel experiment device that can secure a sufficient length of the measurement part for conducting various experiments. By making the measuring cylinder sufficiently long, it is possible to generate an accurate air flow in the measuring section.

According to a second aspect of the present invention, a part of the wall surface of the wind tunnel is composed of a rotary panel rotatable about a vertical axis, one of the rotary panels is a flat surface, and the other wall surface is a curved surface.
By reversing the rotating panel, different air passage cross-sectional areas are formed. This also contributes greatly to downsizing of the compact wind tunnel experiment device.

The invention of claim 3 is characterized by comprising a mainstream direction varying airflow generating device for generating a mainstream direction varying airstream by a plurality of rotating blades and an opening panel.

The mainstream direction-changing airflow generating device has two upper and lower
A panel having eight equally divided fan-shaped slits, a rotating blade of four blades rotatably supported with the center of the fan-shaped slit as an axis, a timing belt for synchronously rotating the rotating blade, and the rotating member. An electric motor for rotating the blade may be provided (claim 4).

By allowing the panel to be attached to and detached from a predetermined portion of the wind tunnel (claim 5), the panel can be attached only when necessary. At that time, if a moving means such as a caster is provided, the attachment / detachment work becomes easy.

According to a sixth aspect of the present invention, there is provided a sound adding device in which slits extending at right angles to the mainstream direction are provided on the ceiling and floor of the model mounting portion in the measuring cylinder, and a plurality of speakers are arranged along each slit. It is characterized by having.

By the sound adding device, it is possible to apply a single-frequency sinusoidal pressure fluctuation in phase or in antiphase to the upper and lower surfaces of the model (claim 7).

According to the invention of claim 8, the outer ring is fixed to the wall surface of the wind tunnel and is supported by the frame standing on the floor surface.
A bearing that rotates the inner ring with a motor,
A pair of upper and lower bars fixed to the inner ring, a tension spring tensioned between both ends of the pair of bars, and an intermediate portion for supporting the DUT in the center portion, which is bridged between intermediate portions of the tension springs. It is characterized by having a spring support constituted by a bar. With this spring support device, various elevation angles (postures) of the test object can be set, and the vibration response of the test object can be measured under the conditions. In addition, it is possible to install a forced vibration device for the DUT that is driven by a motor, a crankshaft, and a slide bearing on the frame and bearings, and perform vertical translational motion, horizontal translational motion under various elevation angles. A vibration state such as a twisting motion can be individually given to the DUT. For example, in order to investigate the basic flutter performance of a long bridge girder cross section, to develop an excellent girder cross section due to anti-flutter performance, and to elucidate various aerodynamic phenomena of a structure, a two-dimensional rigid body model is supported by a spring and its In addition to being used to measure vibration response characteristics, various experiments and measurements such as measurement of unsteady aerodynamic force and unsteady pressure in the forced vibration state are possible. further,
A large-diameter and therefore large-mass bearing is supported by the frame, and the member that supports the DUT is exposed directly from this bearing to the wind tunnel, and wall noise in the wind tunnel is blocked, improving measurement accuracy. .

[0012]

1 and 2 show the general view of a wind tunnel experimental apparatus. FIG. 1 is a side view of a wind tunnel (1) installed in a building of a laboratory, and FIG. 2 is a plan view thereof. As can be seen from these figures, this wind tunnel (1) is an Eiffel type indoor circulation type. The wall surface of the measurement body of the wind tunnel (1) is made of a transparent acrylic plate so that the state of the test object (model) inside can be seen through from the outside. Various devices provided in the measurement body portion of the wind tunnel (1) will be sequentially described below.

A blower (3) driven by an electric motor (2) is installed at the upstream end of the wind tunnel (1). Blower (3)
The airflow discharged from the air outlet of the second passage passes through the diffusion cylinder (4), the flow straightening cylinder (5) and the first contraction cylinder (6), and then the second contraction cylinder (7).
Then, the air flows through the measuring cylinder, blows out from the opening at the downstream end into the laboratory, circulates in the laboratory, and is sucked into the blower (3) again. Specifically, a sirocco fan is adopted as the blower (3), and the diffusion angle of the diffusion cylinder (4) is set to be large (about 60 ° in the illustrated example) so that the length of the blower (3) in the air flow direction can be increased. Coupled with the short
The total length of the wind tunnel (1) could be significantly shortened. As a result, we have realized a compact multi-function wind tunnel experimental device that is an indoor circulation type that uses a small space and that can secure sufficient accuracy even with a small throttle ratio.

Further, as can be seen from FIG. 2, the second contraction cylinder (7) has a pair of rotating panels (8) installed on the left and right of the air passage. Each rotating panel (8) is rotatable about a vertical axis, and in the state shown by the solid line in FIG.
The flat panel wall surface (8a) constitutes a part of the air passage wall surface having a large cross section. From this state, turn the rotating panel (8) 180
When rotated by a degree, the curved panel wall surface (8b) constitutes a part of the air passage wall surface having a small cross section shown by an imaginary line in FIG. In this way, by a simple operation only by reversing the rotating panel (8), it is possible to selectively form two kinds of air passage cross-sectional areas of the large cross section and the small cross section in the single wind tunnel (1). In addition, in order to be able to change the air duct cross-sectional area of the measuring cylinder,
The panel forming the wind tunnel wall on the downstream side of the rotary panel (8) is also movable in the direction traversing the air passage.

On the downstream side of the first contraction cylinder (6), a spyer and a roughness block are provided for the purpose of controlling the turbulent boundary layer and simulating the atmospheric boundary layer corresponding to various surface roughness in the wind tunnel. A turbulent boundary layer generator is provided. This turbulent boundary layer generator is capable of simulating, for example, urban winds, sea winds, and grass winds. Speyer can change the geometric shape unsteadily, and can control various turbulent flow characteristics by using it together with the roughness block. The turbulent boundary layer generator is substantially the same as the conventional one, and is not shown.

A specimen (not shown) such as a model is supported at a predetermined position in the wind tunnel (1) by a spring supporting device (9) shown in FIGS. 3 and 4. The spring support device (9) is the wind tunnel (1)
A large-diameter bearing (11) is attached to the wall surface of the inner ring (11) while the outer ring (11a) of the bearing (11) is fixed.
b) is made rotatable, and an intermediate bar (13) is connected to its inner ring (11b) via a tension spring (12) in a floating state. Outer ring (11a) of bearing (11)
Is a frame (1
Support with 0). The fan-shaped worm wheel (14b) is fixed to the side surface of the inner ring (11b), and the outer ring (1
A servomotor (15) with a speed reducer is fixed to the side surface of 1a), and a worm (14a) that meshes with a worm wheel (14b) is attached to the output shaft of the worm gear (1).
4) is configured.

A pair of upper and lower bars (16) are fixed to the side surfaces of the inner ring (11b), and tension springs (12) are stretched between both ends of the pair of bars (16). Both tension springs (1
The intermediate bar (13) is bridged between the intermediate portions of (2) and the tension spring (12) is balanced so as to be in a floating state. At the center of the intermediate bar (13), there is a mounting portion (18) extending from the through hole (17) in the wall surface of the wind tunnel (1) toward the inside of the air passage, and the mounting portion (18) has a model ( (Not shown) is attached. Since the through hole (17) is present in the wall surface of the wind tunnel (1), the windbreak cover (1a,
1b) is provided. In order to prevent rolling due to wind pressure, an arm (19) is extended from the side surface of the inner ring (11b) in the mainstream direction, a hinge (20) is provided at its end, and a boss (21) is fitted into the arm (19). ) And the center of the bearing (11) are attached to the plate (22),
Attach leaf springs (23) to both ends of 2) and hinge (20)
Allows the model to freely move up and down with the fulcrum as a fulcrum, and prevents lateral shake.

Servo motor (15) and worm gear (1
4) and the driving device composed of the inner ring (11b)
Can be swung to a desired angular position, and a reciprocating rocking motion can be performed. The inclination angle of the model changes with the rotation of the inner ring (11b). In this way, the fixation and inclination angle of the model can be smoothly and easily automatically set. Moreover,
With this spring support device, the elevation angle of the model can be changed and the vibration described below can be performed at the same time. The set inclination angle is, for example, −15 ° to + 15 ° and can be set continuously.
The adjustment of the set angle and the like of the bearing (11) can be performed by remotely controlling the servo motor (15) from the operation panel in the laboratory or manually from the machine side. The degree of freedom of vibration of the model is vertical deflection, twist, flow direction, and rolling, and each mode is changed manually.

Further, the spring support device (9) is provided with a model damping device for free vibration experiment, a model vibration device for free vibration test, a model vibration device for forced vibration test and the like. The model damping device for free vibration experiment is used, for example, in a free vibration experiment for investigating the basic flutter performance of a long-sized bridge girder section and developing a girder section superior in anti-flutter performance. It is a device for adjusting the structural damping of a two-dimensional rigid body model supported by a spring to a predetermined value. Vertical deflection, twist,
Damping control is possible in each of the three modes in the flow direction. The model vibration device for free vibration experiments is a device for forcibly exciting a spring-supported two-dimensional rigid model for the purpose of, for example, the development of girder cross sections of long bridges with excellent wind resistance. Used for steady-state aerodynamic measurement and others.
It is possible to individually control vibration in three modes: vertical deflection, twist, and flow direction. Single-frequency sinusoidal excitation of each mode in in-phase and anti-phase is possible on the left and right sides of the model.

The model vibration device (31) for the forced vibration experiment is
For example, it is used for measurement of unsteady aerodynamic force and unsteady pressure acting on a two-dimensional rigid body model during vibration in order to investigate the flutter performance of a long bridge and to develop a girder section. As shown in FIGS. 5 to 7, the model supported by the bearing (11) is forcibly forced by the crank (33) and the rod (34) driven by the electric motor (32) with a reducer. Vibrate. Model shaker for forced vibration experiment (31)
When used, are mounted symmetrically on the left and right sides of the air passage by bolts on the side surface of the inner ring (11b) of the bearing (11) of the spring support device (9). A linear guide (36) is attached to the plate (35) near the center of the plate at a symmetrical position with respect to the center, and a plate (37) sliding along the linear guide (36) is attached. A bearing (38) is provided at the center of the plate (37) to rotatably support a shaft (40) having an arm (39) connected to the crank rod (34). Then, the model is attached to the inner end of the shaft (40). When the swing fixing pin (39 ') prevents the swing of the arm (39), the plate (37) slides with the rotation of the electric motor (32), and the plate (37) slides directly on the model via the shaft (40). Let When the rocking fixation is released and the slide movement is blocked by the linear movement fixing pin (37 '), the model performs only the rocking movement. Single frequency sinusoidal vibration control is possible in three modes: vertical deflection, twist, and flow direction. When using the vertical bending mode and the twisting mode, fix the linear guide device so that it is in the vertical direction (Fig. 1).
0). When used in the flow direction mode, the linear guide device is fixed so as to be in the main flow direction (Fig. 7). Change each mode manually. The setting angle of the bearing (11) and the vibration frequency are adjusted by remotely controlling the rotation speed of the electric motors (15, 32) from the operation panel in the laboratory.

As described above, the forced vibration test model vibrating devices (31) are provided in pairs on both sides of the air passage and must operate in synchronization with each other. Therefore, when the electric motor (32) is attached to the plate (35), the synchronous rotation of the electric motors (32) and the matching of the rotation angles are electrically adjusted. Alternatively, if the configuration shown by the imaginary line in FIG. 5 is adopted,
Only a single electric motor (32 ') is required, yet synchronization is easy. That is, pulleys (32 ″) are fixed to both ends of a shaft extending across the air passage, and the shaft is rotationally driven by an electric motor (32 ′) and the electric motor (32)
Instead, a driven pulley is attached, and the belt is wound around the driven pulley, the pulley (32 ″), and an idler attached to a stationary member via a spring.

An unsteady / steady aerodynamic force measuring device is attached to the spring support device (9) and the turntable (64).
It is used to measure steady and unsteady aerodynamic forces acting on a two-dimensional rigid model and a three-dimensional overall model in order to elucidate the mechanism of aerodynamic phenomena, investigate flutter performance, and develop girder cross sections with excellent wind resistance. This device uses orthogonal two-component (X, Y) forces,
The moment around the Z axis of the balance can be measured, and the drag, lift, and pitching moment can be measured for small-section experiments, and the drag, lift, and yawing moment can be measured for large-section experiments.

The unsteady / steady-state aerodynamic force measuring device comprises a small-section aerodynamic force measuring device and a large-section aerodynamic force measuring device. Small cross section aerodynamic force measurement device, spring support device (9)
A three-component force detector (balance) is installed in and a model (not shown) is installed between them. Three-component force detector (not shown)
Is fixed to a plate spanning the side surface of the inner ring (11b) of the bearing (11) of the spring support device (9) in the diametrical direction. By adjusting the set angle of the bearing (11) of the spring support device (9), the angle of the model with respect to the air flow can be set arbitrarily. The setting angle is adjusted by remotely controlling the electric motor (15) from the operation panel in the laboratory.

The large-section aerodynamic force measuring device experiment is performed by installing a three-component force detector (balance) on the turntable (64) and mounting a model (not shown) on it. By adjusting the rotation angle of the turntable (64), the set angle of the model with respect to the air flow can be arbitrarily changed. The adjustment of the set angle of the turntable (64) can be performed remotely from the operation panel in the laboratory, which will be described later in relation to the model exciter.

[0025] For the purpose of elucidating the mechanism of aerodynamic characteristics and developing a cross section having more excellent wind resistance, it is used for experimental measurement for investigating and studying the relationship between external stimulus to the separated shear layer and aerodynamic characteristics and the effect of turbulence on various aerodynamic characteristics. Therefore, a periodic fluctuating flow generator that can individually generate a vertical fluctuating airflow and a mainstream direction fluctuating airflow is provided. The periodic fluctuating flow generator comprises a vertical fluctuating air flow generator (47) and a mainstream fluctuating air flow generator (54).

The vertical fluctuating air flow generator (47) generates a vertically fluctuating air flow by sinusoidal vibration of the variable blades.
Place in a small cross section air passage. As shown in FIGS. 8 to 10, a large number of blades (48) are arranged at equal horizontal intervals, and each blade (4
8) is supported by a pin (49) so as to be swingable about a horizontal axis, and a pivot (5) provided at an end of each blade (48) is supported.
0) is connected to the rod (51). The rod (51) is slidable in the longitudinal direction, and the crank (5
Connect with one end of 2). The other end of the crank (52) is connected to the output shaft of an electric motor (53) with a transmission installed on the floor. As a result, the rod (51) moves up and down via the crank (52) as the electric motor (53) rotates, causing the blade (48) to swing. The operating speed of the blades (48) is adjusted by remotely controlling the rotation speed of the electric motor (53) from the operation panel in the laboratory. Further, the swing amplitude of the blade (48) can be adjusted by manually changing the position of the crank (52).

The mainstream-direction-changing airflow generator (54) is arranged in a small-section airflow passage and generates a mainstream-direction-changing airflow by means of a rotating blade and an opening panel. That is,
As shown in FIGS. 11 to 13, fan-shaped slits (56) are provided at two upper and lower portions of the panel (55), and a four-blade rotary blade (57) is rotated about the center of the slits. The opening / closing portion of the slit (56) is repeatedly opened and closed to generate a mainstream direction-changing airflow. The upper and lower rotary blades (57) are synchronously rotated by the timing belt (58), and are rotationally driven by the electric motor (59) with a transmission. Casters (60) are attached to the lower portion of the panel (55) to facilitate installation and removal in the wind tunnel (1). The operating speed of the rotating blade (57) is adjusted by remotely controlling the rotation speed of the electric motor (59) from the operation panel in the laboratory. The driving method of the rotary blade (57) by the electric motor (59) may be shown by an imaginary line in FIG. 11.

A turbulent flow grid (not shown) is installed on the windward side of the model installation position in the measuring cylinder, and a turbulent flow having a prescribed turbulence intensity is generated at the model position. The turbulent flow grid has a structure in which aluminum square pipes and square wood are assembled in a grid with bolts, and is attached to the ceiling and floor of the wind tunnel (1) with bolts and the like. The turbulent flow grid is used for experimental measurement to generate isotropic turbulence with various turbulence intensities in the wind tunnel (1) and investigate the effect of turbulence on various aerodynamic characteristics.

[0029] An acoustic addition device used for experimental measurement for investigating and investigating the relationship between external stimulus to the peeling shear layer and aerodynamic characteristics for the purpose of elucidating the mechanism of various aerodynamic phenomena and developing girder section of a long bridge excellent in wind resistance stability Install (61). This sound adding device (61) stimulates the upper and lower surfaces near the leading edge of the model by sound, and as shown in FIG. 14 and FIG. Slits (6
2) is provided, and a plurality of, for example, eight speakers (63) are arranged along each slit (62). A closed structure will be used except for the sound pressure outlet and the back pressure outlet. Sound pressure outlet is 20m wide
Sound pressure is emitted into the wind tunnel (1) by squeezing it to about m. Frequency adjustment is performed using a frequency generator. ON / OFF of the sound addition device (61) and adjustment of the frequency are performed remotely from the operation panel in the laboratory. It is possible to apply in-phase or anti-phase sinusoidal pressure fluctuations of single frequency to the upper and lower surfaces of the model. For example, the amplitude of pressure fluctuation on the model surface is 1 P at a frequency of 15 Hz in a windless condition.
The frequency is a or more, and the frequency can be continuously controlled in the range of 2 to 60 Hz.

As shown in FIGS. 16 and 17, the model vibration generator (65) is mounted on the turntable (64) in the measuring cylinder.
Is installed. The model exciter (65) is a device for forcibly exciting the base of the model, and assumes a tower structure, an offshore structure, etc., and seismic force measured by another experimental device,
It is used for research to grasp the response behavior of a structure under the action of multiple natural external forces such as wind and waves by applying vibration due to wave force to the model.

The turntable (64) has an outer ring (66).
The inner ring (66) of a large-diameter bearing (66) in which (a) is fixed on a stationary mount (67) and the inner ring (66b) is rotatable.
It is attached to b). An inner gear (68) is formed on the inner peripheral surface of the inner ring (66b) and meshes with a small gear (70) fixed to the output shaft of the servomotor (69). Therefore, the turntable (64) turns as the servomotor (69) rotates. A mounting base (71) is installed on the upper surface of the inner ring (66b), and a guideway (72) is provided on the upper surface of the mounting base (71). A lower table (74) is mounted on the guideway (72) so as to be linearly movable via a slide guide (73). An intermediate table (75) is rotatably mounted on the upper surface of the lower table (74).
The upper table (76) is placed on top of 5). The intermediate table (75) is attached to the lower table (7
4) has a shaft (76) penetrating therethrough, and this shaft (7
One end of the arm (77) is fixed to the lower end of 6).
The other end of the arm (77) is connected via a rod (78) to a crank (80) attached to the output shaft of a motor with reduction gear (79). By fixing the lower table (74) to the base (71) and preventing the linear motion of the lower table (74) from being linearly fixed, the intermediate table (75) is fixed to the lower table (74). Swing fixing pin (82) for preventing swing of the intermediate table (75)
Is provided.

With the model vibrating device (65), sinusoidal vibrations can be individually applied in the three directions of the horizontal direction perpendicular to the air flow, the air flow direction, and the rotation direction around the vertical axis. That is, when vibrating in the horizontal direction perpendicular to the air flow and in the air flow direction, the linear motion fixing pin (81) is removed to cancel the linear motion, and the swing fixing pin (82) is inserted to insert the intermediate table (75). ) Rocking. As a result, the electric motor (7
With the rotation of 9), the upper table (76) integrally moves with the lower table (74) and the intermediate table (75) to perform a linear reciprocating motion. When vibrating in the direction of rotation about the vertical axis, the rocking fixing pin (82) is removed to cancel the rocking motion, and the linear motion fixing pin (81) is inserted to linearly move the lower table (74). Prevent. As a result, as the electric motor (79) rotates, the upper table (7
6) swings integrally with the intermediate table (75).
To adjust the vibration frequency, use the electric motor (7
It is performed by remotely controlling the rotation speed in 9), and the angle of the crank rotation movement is manually set. Servo motor (6
This is done by rotating 9) and turning the turntable (64).

16 (B), the shaft (76) in FIG. 16 (A) is replaced with a hollow pipe (76 ') and an opening is also provided in the upper table (76) and the intermediate table (75) to form a through hole (76). The model vibration device (65) in which the "" is formed is shown as a modification. Due to the presence of the through hole (76 "), a balance is installed on a support stand that is raised from the floor surface, and the balance is provided with the through hole (76"). ) From the wind tunnel.

The inclined cable support device (83) shown in FIGS. 18 and 19 is assumed to be a transmission line cable or cable-stayed bridge cable, and has a better cable control against the relation between the cable posture and aerodynamic characteristics and cable vibration. In order to develop the vibration device, the cable model can be supported in any wind direction. Use piano wire for the model support cable. One end of the cable model (84) is fixed to an upper stopper (85) installed on the ceiling of the turntable (64), and the other end is fixed to the turntable (6).
4) It is fixed to the lower stopper (86) provided near the outer circumference. The upper stopper (85) is located at the tip of the swivel arm (87), and the swivel arm (87) has a reduction gear motor (8).
It is driven to rotate by 8). The elevation angle (α) of the cable model with respect to the horizontal plane is fixed at 45 °. The horizontal deflection angle (β) of the cable model with respect to the air flow can be adjusted in the range of 0 ° <β <360 ° by rotating the arm (87) or the turntable (64). The setting angle is adjusted by remotely controlling the electric motor (88) by operating the push button on the operation panel in the laboratory.

20 and 21 show a cable support device (89) for a rain vibration experiment. This device (89) assumes a transmission line cable, cable-stayed bridge cable, etc., and develops a full-scale cable model (for the aerodynamic characteristics of the cable accompanying rainfall and the development of a more effective vibration control device against cable vibration). 90) to support and measure physical quantities such as response and pressure. The inclination angle is set to 45 ° for both the elevation angle α of the cable model with respect to the horizontal plane and the horizontal deflection angle α of the cable model with respect to the air flow.

Reference numeral 91 in FIGS. 20 and 21 indicates a rainfall device. This rainfall device (91) assumes transmission line cables, cable-stayed bridge cables, etc., and in order to develop a better damping device against aerodynamic vibrations, it will generate artificial rainfall in the wind tunnel, and aerodynamics of the cables accompanied by rainfall will occur. Used for the purpose of investigating properties. From the ceiling upstream of the measurement unit, raindrops can be generated over the entire width direction of the large cross section of the measurement barrel, and on the rear end ceiling of the turntable (64) of the measurement barrel,
The tap water is introduced and the measurement part is made to rain from the nozzle. Guideways are attached to both sides of the measurement section parallel to the mainstream direction, and bridges are passed at right angles to the mainstream direction.
The bridge can be manually moved on the guideways on both sides to set the rainfall position. When one is stopped and the other is moved, the bridge hangs diagonally in the direction perpendicular to the mainstream. A plurality of nozzles, for example, ten nozzles are attached to the bridge at equal intervals to generate uniform artificial rainfall in the measurement part in the wind tunnel. Under the floor to waterproof the device from splashes that return,
Provide an acrylic cover. A dike is installed near the cover to guide the water in the gutter to the dry area. In addition, a net is placed on the downstream wall to absorb raindrops. ON / OFF of the rainfall of the rainfall device (91) and control of the rainfall flow rate are performed remotely from the operation panel in the laboratory.

[0037]

As described above, according to the present invention,
By adopting a sirocco fan as the blower and increasing the diffusion angle of the diffusion cylinder, it is possible to shorten the length in the air flow direction and provide a compact indoor circulation type wind tunnel experiment device. In addition, by providing various devices in the measurement barrel portion, it is possible to obtain a multi-function wind tunnel experimental device which has a compact structure and can perform various experiments and measurements.

[Brief description of drawings]

FIG. 1 is a side view of a wind tunnel test device.

FIG. 2 is a plan view of a wind tunnel test device.

FIG. 3 is a front view of a spring support device.

FIG. 4 is a sectional view of a spring support device.

FIG. 5 is a front view of the model vibration device for forced vibration experiment.

FIG. 6 is a cross-sectional view of a model vibration device for forced vibration experiment.

FIG. 7 is a front view of a model vibration device for forced vibration experiment.

FIG. 8 is a front view of the vertical fluctuating airflow generation device.

FIG. 9 is a cross-sectional view (A) of the vertical fluctuating airflow generator and a plan view (B) of the blade.

FIG. 10 is an enlarged view of part C of FIG. 9B.

FIG. 11 is a front view of a mainstream direction-changing airflow generating device.

FIG. 12 is a cross-sectional view of a mainstream direction variable airflow generating device.

13 is an enlarged view (A) of the part A in FIG. 12 and a front view (B) of the rotary blade.

FIG. 14 is a cross-sectional view (A) and a longitudinal cross-sectional view (B) of a main part of the wind tunnel showing the sound adding device.

FIG. 15 is an enlarged view of the speaker.

FIG. 16 is a sectional view of a model vibration device.

FIG. 17 is a plan view of the model vibration device.

FIG. 18 is a cross-sectional view of a wind tunnel showing a tilted cable support device.

FIG. 19 is a plan view of a tilted cable support device.

FIG. 20 is a side view of a rain vibration experiment cable support device and a rainfall device.

FIG. 21 is a plan view of a cable support device for rain vibration experiments and a rainfall device.

[Explanation of symbols]

 1 Wind Tunnel 3 Blower 4 Diffuser Cylinder 8 Rotating Panel 9 Spring Support Device 31 Forced Vibration Experiment Model Excitation Device 47 Vertical Fluctuation Airflow Generator 54 Mainstream Direction Fluctuation Airflow Generator 61 Sound Addition Device 64 Turntable 65 Model Vibration Device 83 Tilt Cable support device 89 Cable support device for rain vibration experiment 91 Rainfall device

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Yasuhiro Miyasaka 26, 314 Oedakushikakecho, Nishikyo-ku, Kyoto City, Kyoto Prefecture Miyasaka Manufacturing Co., Ltd.

Claims (8)

[Claims] 1. A sirocco fan is adopted as a blower,
An indoor circulation type wind tunnel experiment device characterized in that the length of the flow in the air flow direction of the rectifying cylinder is shortened and the length of the measuring cylinder is sufficient by increasing the diffusion angle of the diffusion cylinder. 2. A part of a wall surface of a wind tunnel is composed of a rotary panel rotatable about a vertical axis, one of the rotary panels is a flat surface, and the other wall surface is a curved surface, which is different by rotating 180 degrees. The wind tunnel experimental device according to claim 1, wherein an air passage cross-sectional area is formed. 3. The wind tunnel experimental apparatus according to claim 2, wherein a mainstream direction fluctuation airflow generator for generating a mainstream direction fluctuation airflow by a plurality of rotating blades and an opening panel is arranged in the small cross section air passage. 4. The main-stream-direction-changing airflow generating device rotatably supports a panel having fan-shaped slits at two upper and lower positions and a center of the fan-shaped slit as an axis.
The wind tunnel experimental apparatus according to claim 3, further comprising: a single-blade rotary blade, a timing belt for synchronously rotating the rotary blade, and an electric motor for rotationally driving the rotary blade. 5. The wind tunnel experimental device according to claim 4, wherein the panel is detachably attached to a predetermined portion of the wind tunnel. 6. A slit extending perpendicularly to the mainstream direction is provided on the ceiling and floor of the model mounting portion in the measuring cylinder,
The wind tunnel experiment device according to claim 1, further comprising an acoustic addition device in which a plurality of speakers are arranged along each slit. 7. The wind tunnel experimental apparatus according to claim 6, wherein the acoustic addition device applies a single-frequency sinusoidal pressure fluctuation in phase or in antiphase to the upper and lower surfaces of the model. 8. A bearing which fixes an outer ring to a wall surface of a wind tunnel and is supported by a frame erected on a floor surface so that an inner ring is driven to rotate by a motor, a pair of bars fixed to the inner ring, and a pair of the pair. The spring support comprises a tension spring stretched between both ends of the bar, and an intermediate bar for supporting the device under test in the center, which is bridged between the intermediate parts of the tension spring. The wind tunnel test device according to claim 1.