JPH09218127A - Wind tunnel test device for wind direction fluctuation - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a device having the capability of simulating a wind direction fluctuation on the leeward of a test model, or in a range requiring measurements, to a wind direction fluctuation in the open air, regarding a wind tunnel test method for a wind direction fluctuation used in a wind tunnel test for environment assessment or the like. SOLUTION: Wind direction fluctuation devices 8a to 8c are formed out of rotating shafts 2a to 2c erected upright in a wind tunnel measurement part 1 and turned with rotation devices 3a to 2c, and diaphragms 4a to 4c fastened to the rotating shafts 2a to 2c and caused to horizontally oscillate, due to the turn of the rotating shafts 2a to 2c. The devices 8a to 8c are arranged by a plurality of rows along the axial direction of the wind tunnel measurement part 1. According to this construction, the fluctuation of a wind direction occurring on the windward side of a test model 5 is fed with wind direction fluctuation energy with the axially arranged wind direction fluctuation devices 8a to 8c. As a result, the wind direction fluctuation can be kept approximately equal throughout the wind tunnel measurement part 1, thereby repeating a wind direction fluctuation similar to the open air.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an exhaust gas diffusion wind tunnel experiment or the like carried out for an environmental assessment, in which the wind direction similar to the atmosphere at the place where the environmental assessment is performed is performed in the wind tunnel measuring section in which the test model is installed. The present invention relates to a wind direction fluctuation wind tunnel experimental device for reproducing fluctuations.

[0002]

2. Description of the Related Art In an exhaust gas diffusion wind tunnel experiment or the like, a wind direction change at a place where a simulated chimney or the like is actually constructed (hereinafter referred to as a site) is similar to a wind tunnel measurement section in which a chimney model or the like for performing the experiment is installed. As a wind direction fluctuation wind tunnel experiment device that reproduces the wind direction fluctuation, the one shown in FIG. 3 has been conventionally used.

As shown in the figure, a wind tunnel measuring section 01 for installing a chimney model 05 is provided in the middle of a wind tunnel which has an air flow generating device such as a blower and which generates an air flow flowing in the axial direction of the wind tunnel axis. Has been. On the upstream side of the wind tunnel measuring unit 01, a plurality of rotating shafts 02 arranged in a line at right angles to the flow are provided upright, and each of the rotating shafts 02 is
Two to four vertical diaphragms 04 are attached to the outer peripheral surface. The rotating shaft 02 is rotated in the forward and reverse directions about the vertical axis by a rotating device 03 such as a pulse motor provided under the floor of the measuring unit 01. By rotating the rotating shaft 02,
The vertical vibrating plate 04 swings in the horizontal direction and is rectified to generate a uniform flow, which causes a change in the wind direction of the air flow 07 flowing into the measurement unit 01.

Therefore, an arrangement of the wind direction fluctuation device composed of the rotary shaft 02 installed on the upstream side of the measuring section 01 and the vertical vibration plate 04, and the individual rotary shafts 02 by the rotary device 03.
By controlling the rotation of the wind tunnel, the wind tunnel measuring unit 01 reproduces an air flow with a wind direction fluctuation similar to the ground wind direction fluctuation occurring at the site.
In such an air flow 7, for example, the chimney model 05 is installed, the gas 06 is discharged from the chimney model 05, and the concentration distribution of the discharged gas 06 is measured on the leeward side, so that the gas is discharged from the actual chimney. It is possible to know the diffusion situation of the smoke that is generated in the field, and it is possible to carry out an environmental assessment associated with the chimney installation by a wind tunnel experiment.

However, as described above, the wind tunnel measuring unit 01
On the windward side of, as shown in the figure, a plurality of wind tunnel fluctuation devices are provided in one row so as to be orthogonal to the flow, and the wind direction fluctuation is generated in the wind tunnel measurement unit 01. In the conventional wind direction fluctuation wind tunnel experimental device,
The wind direction fluctuation generated on the windward side of the wind tunnel measurement unit 01 is attenuated in the leeward direction, and the spread width is narrowed, and the predetermined wind direction fluctuation range can be maintained at the predetermined position in the leeward direction that requires measurement. However, there was a problem in that there was a difference with the wind direction fluctuation that occurred locally.

That is, as shown in the figure, the chimney model 05
In the vicinity of the vertical vibration plate 04, the gas 06 emitted from the gas sways to the left and right due to the change in the wind direction generated by the vibration of the vertical vibration plate 04, and has a shape similar to the smoke discharged from the chimney installed at the site. Although it spreads widely, the wind direction fluctuation energy decreases as it goes downwind, and the spread width narrows, which is a difference from the actual outdoor phenomenon.

[0007]

DISCLOSURE OF THE INVENTION The present invention solves the above-mentioned problems of the conventional wind direction fluctuation wind tunnel test apparatus by at least the direction required to conduct the wind tunnel test and to measure the wind direction from the installed test model. In the wind tunnel measuring section up to the predetermined position of
An object of the present invention is to provide a wind direction fluctuation wind tunnel experiment device capable of continuously generating wind direction fluctuations and preventing attenuation of the wind direction fluctuation width.

[0008]

Therefore, the wind direction fluctuation wind tunnel experimental apparatus of the present invention as defined in claim 1 has the following means.

(1) The wind tunnel measuring section stands upright on the floor and is fixed to the outer circumference of the rotary shaft and the rotary shaft which is rotated in the forward and reverse directions about the vertical axis by a rotating device provided under the floor.
A plurality of rows of wind direction changing devices, which consist of a vibration plate that horizontally oscillates due to the rotation of the rotary shaft and generate a wind direction change in the wind tunnel measurement unit, are arranged in the axial direction (downward direction) of the wind tunnel measurement unit.

The wind direction changing device is provided with at least one row of a plurality of models arranged in the direction perpendicular to the flow on the windward side of the test model installed in the wind tunnel measurement section, and the measurement of the test model is performed. If there are at least one row of multiple wind tunnel measurement units arranged in the direction perpendicular to the flow, on the leeward side of the test model of the wind tunnel measurement unit, the wind direction of the same size is distributed over the entire wind tunnel measurement unit. It is preferable to provide a plurality of rows in the axial direction of the wind tunnel measuring unit so that the fluctuation can be continuously generated and the attenuation of the wind direction fluctuation width that occurs in the axial direction of the wind tunnel measuring unit can be prevented. Further, the arrangement of the wind direction changing devices in the wind tunnel measuring unit may be a grid shape or a staggered grid shape in a plan view.

(A) The wind direction fluctuation wind tunnel experimental apparatus of the present invention is
By means of the above-mentioned (1), the energy of the wind direction fluctuation is continuously applied to the entire area of the wind tunnel measurement unit, and it is prevented that the wind direction fluctuation energy is attenuated as it goes downwind of the wind tunnel measurement unit. Therefore, it is possible to obtain an airflow with a wind direction variation similar to the wind direction variation occurring locally. Thereby, for example, the gas released from the chimney model installed in the wind tunnel measurement unit will spread widely to the left and right even on the lee side, which is a predetermined amount away from the test model installed in the wind tunnel measurement unit, It is possible to reproduce the diffusion phenomenon similar to the site in the wind tunnel measurement section.

The wind direction fluctuation wind tunnel experimental apparatus of the present invention as defined in claim 2 has the following means.

(2) A test piece in which the support rods, which are upright on the floor of the wind tunnel measuring section and whose upper and lower ends are respectively fixed to the ceiling and floor surface forming the wind tunnel measuring section, are installed in the wind tunnel measuring section. At least one row was provided on each of the windward side and the leeward side of the model, and a plurality of rows were arranged in the axial direction of the wind tunnel measurement unit. The support rods are arranged in rows at right angles to the flow, and the same direction of wind direction fluctuation is continuously generated over the entire wind tunnel measurement section, and the wind tunnel fluctuation occurs in the axial direction of the wind tunnel measurement section. Arrangement is desirable so that width attenuation can be prevented. Further, the support rods may be arranged in a grid pattern or a zigzag pattern in plan view.

(3) The length of the ceiling and the floor is 1/2 or less in the longitudinal direction, and one side end of the cloth piece divided into a plurality of pieces is arranged at a substantially equal pitch in the height direction of the support rod. It was fixedly provided. In addition, it is preferable that the lateral length of the cloth piece is equal to or less than the distance between the support rods to be fixed and the adjacent support rods.

(B) The wind direction fluctuation wind tunnel experimental apparatus of the present invention is
By means of the above (2) and (3), although the average energy of the air flow in the wind tunnel measurement unit is lower than the average energy when flowing into the wind tunnel measurement unit, the energy of wind direction fluctuation is continuously added. As in (a) above, it is possible to prevent the attenuation of the wind direction fluctuation energy, and the wind tunnel measuring section including the windward side of the test model installation section is used to generate an air flow with a wind direction fluctuation similar to the wind direction fluctuation occurring locally. It can be generated over the entire area.

Therefore, for example, the gas emitted from the chimney model diffuses widely to the left and right, and a diffusion phenomenon similar to the field can be reproduced in the wind tunnel measurement section. Further, in the wind direction fluctuation wind tunnel experimental device of the present invention, without the need for a rotating device and a drive source, only the action of the air flow flowing through the wind tunnel measurement unit to the cloth piece, the entire wind tunnel measurement unit,
Since the energy of wind direction fluctuation will be continuously applied, the structure will be simple and the operating cost will be included.
An inexpensive device can be provided.

[0017]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of the wind direction fluctuation wind tunnel experimental apparatus of the present invention will be described below with reference to the drawings. FIG.
FIG. 1 is a diagram showing a first embodiment of a wind direction fluctuation wind tunnel experimental apparatus of the present invention, FIG. 1 (a) is a side view, and FIG. 1 (b) is FIG.
It is a top view in arrow AA shown in (a).

As shown in the figure, a wind tunnel measuring section 1 for installing a chimney model 5 as a test model is provided in the middle of the wind tunnel, which is equipped with a blower or the like and internally generates an air flow flowing in the axial direction. There is. In the wind tunnel measuring section 1 on the windward side of the chimney model 5, the floor is erected through the floor, and the upper end is supported by a bearing provided on the ceiling so as to be rotatable, and a plurality of them are arranged in a direction perpendicular to the flow. The rotary shafts 2a arranged in one line are provided. 2 to each of the rotating shafts 2a
A vertical vibrating plate 4a, which is made up of four sheets, is fixed to the rotary shaft 2a so as to swing in the horizontal direction as the rotary shaft 2a rotates.

Further, each of the rotating shafts 2a is provided with a rotating device 3a such as a pulse motor provided under the floor of the measuring unit 1.
Then, the vertical vibration plate 4a is rotated around the vertical axis, and the vertical vibration plate 4a is horizontally swung by the rotation of the rotation axis 2a, and the wind direction of the airflow 7 that is rectified and flows into the measurement unit 1 is changed. The first side includes a rotary shaft 2a installed on the upstream side of the measurement unit 1, that is, on the windward side of the chimney model 5, and a vertical diaphragm 4a.
By arranging the row wind direction changing device 8a and controlling the rotation of each rotating shaft 2a by the rotating device 3a, it is possible to reproduce a wind direction change similar to the local wind direction change on the windward side of the chimney model 5.

Similarly, on the leeward side of the chimney model 6 of the wind tunnel measuring unit 1, the second-direction air-direction changing device 8b and the third-direction air-direction changing device 8a each having the same structure as the first-row air-direction changing device 8a. The wind direction changing device 8c in the second row is provided.

As described above, the wind direction changing device 8a is provided on the windward side of the chimney model 5 installed in the wind tunnel measuring section 1, and a plurality of wind direction changing devices 8 are provided all over the leeward side of the chimney model 5.
Rotating shafts 2b and 2c and vertical diaphragms 4b and 4c, which are provided as b and 8c in the second and third rows and constitute wind direction changing devices 8b and 8c, are rotated by the rotating devices 3b and 3c. By oscillating, the wind direction fluctuation generated in the wind direction fluctuation device 8a in the first row is not attenuated and is similarly held on the leeward side of the wind tunnel measurement unit 1, and the width of the wind direction fluctuation can be reduced. Gas 6 exhausted from the chimney model 5
Is spread in a state similar to the actual spread in the field. That is, it is possible to generate the wind direction variation in the entire wind tunnel measurement unit 1, which is similar to the actual field phenomenon in the field.

As a method of rotating and swinging the wind direction changing devices 8a to 8c, a predetermined wind direction changing width θ is set with an angle of 0 degree parallel to the wind direction of the rectified airflow 7 flowing into the wind tunnel measuring unit 1. It is effective to rotate and oscillate at a rotation angle so as to obtain a uniform random number distribution between degrees. Further, when a space is provided in a part of the joint between the vertical diaphragms 4a to 4c and the rotary shafts 2a to 2c so as to be pivotally oscillated, the size of the wind direction fluctuation vortices generated by these wind direction fluctuation devices 8a to 8c. Can be non-uniform, approaching the actual eddy configuration in the field and making gas diffusion more similar to field diffusion.

Next, FIG. 2 is a view showing a second embodiment of the wind direction fluctuation wind tunnel experimental apparatus of the present invention, FIG. 2 (a) is a side view, and FIG. 2 (b) is FIG. 2 (a). It is a top view in the arrow BB shown in FIG.

As shown in the figure, in a wind tunnel measuring section 1 in which a chimney model 5 as a test model is installed on a floor surface 9, the upper end is fixed to the ceiling 10 and the lower end is fixed to the floor surface 9. Further, four support rods 11 are provided which are upright and arranged in a line at right angles to the direction of the air flow 7 and arranged in one row. The support rod 11 has a rectangular piece 1 of which one end is fixedly attached.
Two 2 are provided at equal pitches in the height direction.

The support rods 11 arranged in one row are the support rods 1.
The wind tunnel measuring unit 1 with a uniform flow by the cloth piece 12 fixed to 1
A first row is provided on the windward side of the chimney model 5 so that a wind direction variation similar to the local wind direction variation can be generated at the installation position of the chimney model 5 in the airflow 7 flowing into
The second row, the third row, and the fourth row are provided on the leeward side of the first row with an interval in consideration of the attenuation of the wind direction fluctuation caused by 2. Further, as described above, the plurality of cloth pieces 12 are provided at intervals in the height direction, so that the length in the vertical direction is set to be equal to or less than the number of spaces between the floor surface 9 and the ceiling 10. At the same time, the lateral length thereof is sized so as not to interfere with the support rod 11 arranged adjacent to the fixed support rod 11.

As described above, in the present embodiment, a plurality of support rods 11 are erected upright in the direction orthogonal to the air flow 7 over the entire windward and leeward of the model chimney 5 installed in the wind tunnel measuring section 1. A plurality of rows formed by the above are provided, and a plurality of oscillating cloth pieces 12 are installed on each of the support rods 11 and oscillated by the action of the air flow 7. The fluctuation of the wind direction can be the airflow 7 maintained at a predetermined size, and the gas discharged from the chimney has a diffusion width similar to that in the field. In particular, since the size of the wind direction fluctuation vortex generated by the cloth piece 12 is not uniform, it becomes close to the configuration of the vortex actually generated in the field, and the diffusion of gas becomes more similar to the diffusion situation in the field. Further, in the wind direction fluctuation wind tunnel experiment device of the present embodiment, the wind tunnel measurement unit 1 is provided without the need for the rotating device 3a such as the pulse motor and the drive source for driving the rotating device 3a described in the first embodiment. Since the wind direction fluctuation is generated by the energy of the inflowing airflow 7, the average energy of the airflow 7 of the wind tunnel measurement unit 1 is lower than the average energy at the inflowing time, but the configuration is simple and the handling is easy. As it becomes easier
The cost of the device can be kept low, including operating costs.

[0027]

As described above, according to the wind direction fluctuation wind tunnel experiment device of the present invention, the configuration according to claims 1 and 2 provides
The wind direction fluctuation is maintained at a predetermined magnitude in the entire wind tunnel measurement unit, and the disturbance generated by the test model installed in the wind tunnel measurement unit can be maintained in the entire wind tunnel measurement unit without being attenuated. So, for example, the gas emitted from the chimney model is
Even at the measurement location on the downstream side of the wind tunnel measurement section, the diffusion width can be similar to that in the field.

As a result, the gas emitted from the chimney model installed in the wind tunnel measurement unit diffuses widely to the left and right even on the leeward side of the wind tunnel measurement unit, and a diffusion phenomenon similar to the field is diffused in the wind tunnel. The environmental assessment results that can be reproduced and are highly accurate can be obtained by wind tunnel experiments. Further, with the configuration according to claim 2, it is possible to make the configuration simpler than that of the conventional wind direction fluctuation experiment device, facilitate the wind tunnel experiment, and reduce the cost of the device including the operating cost. .

[Brief description of drawings]

1A and 1B are diagrams showing a first embodiment of a wind direction fluctuation wind tunnel experimental apparatus of the present invention, in which FIG. 1A is a side view and FIG. 1B is FIG.
The top view in the arrow AA shown in (a),

2A and 2B are views showing a second embodiment of the wind direction fluctuation wind tunnel experiment device of the present invention, FIG. 2A being a side view and FIG.
The top view in the arrow BB shown in (a),

3A and 3B are views showing an example of a conventional wind direction fluctuation wind tunnel experiment device, FIG. 3A is a side view, and FIG. 3B is a plan view taken along the arrow CC shown in FIG. 3A. is there.

[Explanation of symbols]

 1 Wind Tunnel Measuring Section 2a, 2b, 2c Rotating Shafts 3a, 3b, 3c Rotating Device 4a, 4b, 4c Vertical Vibration Plate 5 Chimney Model 6 Gas (Flow) 7 Air Flow 8a, 8b, 8c Wind Direction Change Device 9 Floor 10 Ceiling 11 Support rod 12 piece of cloth

Claims (2)

[Claims] 1. A wind direction changing device comprising a rotating shaft upright in a wind tunnel measuring unit and a diaphragm fixed to the rotating shaft and swinging in a horizontal direction, and a rotation installed under the floor of the wind tunnel measuring unit. A wind direction fluctuation wind tunnel experimental device configured to generate a wind direction fluctuation in the wind tunnel measurement unit by rocking the diaphragm by driving the rotation shaft by the rotation device, wherein the wind direction fluctuation device is the wind tunnel measurement unit. A wind direction fluctuation wind tunnel experimental device characterized by being arranged in a plurality of rows in the axial direction of the. 2. A wind direction fluctuation wind tunnel experimental apparatus for generating a wind direction fluctuation in a wind tunnel measuring unit, wherein a plurality of columns are erected on a windward side and a leeward side of a test model installed in the wind tunnel measuring unit,
From a support rod whose upper end and lower end are fixed to the ceiling and floor of the wind tunnel measuring unit, respectively, and a piece of cloth which is divided into a plurality in the height direction and whose one end is fixed to the support rod. A wind direction fluctuation wind tunnel experiment device characterized by: