JP6846885B2 - Fluctuating wind generator, wind tunnel test device using this, and fluctuating wind generation method - Google Patents

Description

The present invention relates to a fluctuating wind generator, a wind tunnel test device using the fluctuating wind generator, and a fluctuating wind generating method.

Wind tunnel test equipment is used to test properties against airflow. The wind tunnel test device is provided with a blower on one end side of the device, and the blower is driven to form an air flow in the wind tunnel, and various characteristics are measured in the measurement area. Some wind tunnel test devices include a wind direction control mechanism that changes the wind direction in the measurement area and an air volume control mechanism that controls the air volume (see Patent Document 1).

In the device described in Patent Document 1, wings serving as a wind direction control mechanism are arranged on the upstream side of the measuring unit, and a damper serving as an air volume control mechanism is provided in a bypass portion not connected to the measuring chamber. The device described in Patent Document 1 adjusts the direction of the wind flowing through the measuring section with the direction of the wing, and adjusts the amount of air flowing through the bypass section with a damper to adjust the amount of air flowing through the measuring section. ..

Jikkenhei 3-97641

Here, the wind tunnel test apparatus described in Patent Document 1 is provided with both the blade 2 and the damper 4 on the upstream side of the measurement chamber, so that the apparatus configuration becomes large. The direction of the blade 2 and the direction of the wind flowing through the measuring unit 1 can be adjusted by the damper 4, and the amount of air flowing through the measuring unit 1 can be adjusted, but the experimental conditions that can be reproduced are limited.

The present invention has been made in view of the above circumstances, and is a fluctuating wind generator capable of simplifying the device configuration and efficiently executing various tests, a wind tunnel test device using the variable wind generator, and a wind tunnel test device using the same. An object of the present invention is to provide a method for generating fluctuating winds.

The present invention for solving the above-mentioned problems is a fluctuating wind generator arranged at the outlet of the air passage on the upstream side of the measurement area of the measurement chamber to which air is supplied from the air passage. A plurality of blades arranged in a row in a direction orthogonal to the direction of air flow in the air passage, a drive unit for rotating the blades, and the direction of the blades are controlled to control the direction of the wind. The wing has a control device for generating a fluctuating wind in which the flow in the flow direction and the direction orthogonal to the flow of the wind changes, and the wing has a shape in which the thickness in the arrangement direction becomes thicker as the distance from the end is increased. The shape is symmetric with respect to the direction orthogonal to the arrangement direction of.

Further, the blades preferably have a symmetrical shape with the arrangement direction of the blades as an axis.

Further, it is preferable that the drive unit has an individual drive unit for driving one of the blades for each of the plurality of blades.

Further, it is preferable that the plurality of blades all have the same shape.

Further, it is preferable that the drive unit is rotated around the center of the blade in the flow direction.

Further, it is preferable that the control device includes an operation mode in which at least two adjacent blades of the plurality of blades are rotated in opposite directions and the remaining blades are fixed in the same direction.

Further, it is preferable that the control device includes an operation mode in which at least two adjacent blades of the plurality of blades are rotated in opposite directions and the remaining blades are rotated in the same direction.

Further, it is preferable that the control device includes an operation mode in which adjacent blades are rotated in the opposite direction.

The present invention for solving the above-mentioned problems is a wind tunnel test apparatus, characterized in that it has a fluctuating wind generator according to any one of the above and a measurement chamber to which the fluctuating wind generator is connected. And.

The present invention for solving the above-mentioned problems covers the entire outlet of the air passage on the upstream side of the measurement region of the measurement chamber where air is supplied from the air passage, and is orthogonal to the air flow direction in the air passage. This is a fluctuating wind generation method in which the directions of a plurality of blades arranged in a row in the direction in which the blades are arranged are controlled to generate a fluctuating wind in the measurement region. It is characterized in that it is rotated to and the remaining wings are fixed in the same direction.

The present invention for solving the above-mentioned problems covers the entire outlet of the air passage on the upstream side of the measurement region of the measurement chamber where air is supplied from the air passage, and is orthogonal to the flow direction of the air in the air passage. This is a fluctuating wind generation method in which the directions of a plurality of blades arranged in a row in the direction in which the blades are arranged are controlled to generate a fluctuating wind in the measurement region. It is characterized in that it is rotated in the same direction and the remaining wings are rotated in the same direction.

The present invention for solving the above-mentioned problems covers the entire outlet of the air passage on the upstream side of the measurement region of the measurement chamber where air is supplied from the air passage, and is orthogonal to the flow direction of the wind in the air passage. It is a method of generating a fluctuating wind that controls the direction of a plurality of blades arranged in a row in the direction of the wind and generates a fluctuating wind in the measurement region, and is characterized by rotating adjacent blades in the opposite direction.

According to the present invention, the direction and the wind speed are different by controlling the direction of the blades arranged in the entire area of the opening and generating a fluctuating wind in which the flow direction and the flow in the direction orthogonal to the wind flow change. Various winds can be reproduced. As a result, the conditions that can be reproduced can be increased, and various tests can be efficiently executed. Further, since the structure is such that the wings are arranged in the entire area of the opening, the device configuration is simplified.

FIG. 1 is a schematic view showing a schematic configuration of a wind tunnel test device. FIG. 2 is a cross-sectional view showing a schematic configuration of a fluctuating wind generator. FIG. 3 is a schematic view showing a part of the fluctuating wind generator in an enlarged manner. FIG. 4 is a cross-sectional view showing an example of the shape of the wing. FIG. 5 is a cross-sectional view showing an example of the shape of the wing. FIG. 6 is a cross-sectional view showing an example of the shape of the wing. FIG. 7 is an explanatory diagram showing an example of the operation of the fluctuating wind generator. FIG. 8 is an explanatory diagram showing an example of the operation of the fluctuating wind generator. FIG. 9 is an explanatory diagram showing an example of the operation of the fluctuating wind generator. FIG. 10 is an explanatory diagram showing an example of the operation of the fluctuating wind generator. FIG. 11 is an explanatory diagram showing an example of the operation of the fluctuating wind generator. FIG. 12 is an explanatory diagram showing an example of the operation of the fluctuating wind generator. FIG. 13 is an explanatory diagram showing an example of the operation of the fluctuating wind generator. FIG. 14 is an explanatory diagram showing an example of the operation of the fluctuating wind generator. FIG. 15 is an explanatory diagram showing an example of the operation of the fluctuating wind generator.

Hereinafter, embodiments (embodiments) for carrying out the present invention will be described in detail with reference to the drawings. The present invention is not limited to the contents described in the following embodiments. In addition, the components in the following embodiments include those that can be easily assumed by those skilled in the art, those that are substantially the same, that is, those in a so-called equal range. Further, the components disclosed in the following embodiments can be appropriately combined without departing from the gist of the present invention.

A wind tunnel test apparatus having a fluctuating wind generator according to the present embodiment will be described with reference to the drawings. FIG. 1 is a schematic view showing a schematic configuration of a wind tunnel test device.

The wind tunnel test device 10 includes a wind tunnel 12, a fan (blower) 13, and a fluctuating wind generator 100. The wind tunnel 12 is a path through which air flows, and has an air passage 15 and a measurement chamber 17. The air passages 15 are a plurality of pipes bent at four places in the present embodiment, one end of which is a suction port (collector) 20 and the other end of which is an air outlet 22. In the air passage 15, the suction port 20 and the air outlet 22 face each other.

Further, the wind tunnel 12 is provided with corner vanes 26a, 26b, 26c and 26d at four bent portions of the air passage 15, that is, corner portions. The corner vanes 26a, 26b, 26c, and 26d are mechanisms for guiding the direction of the air flowing through the air passage 15 from the upstream direction to the downstream direction. In the present embodiment, the corner vanes 26c, 26d, 26a, and 26b are arranged in this order from the suction port 20 toward the air outlet 22. The air passage 15 guides the air with the corner vanes 26c, 26d, 26a, and 26b to reduce the resistance in the air passage 15.

The measurement room 17 is a room in which both ends of the air passage 15 are inserted. In the measurement chamber 17, the suction port 20 and the air outlet 22 are exposed to the inside. The measurement chamber 17 is provided with a measurement area 27 in which a test body and, in this embodiment, a vehicle 8 are arranged between the suction port 20 and the air outlet 22. In this way, in the wind tunnel 12, both ends of the air passage 15 are connected to the measurement chamber 17, and the air passage 15 and the measurement chamber 17 form a path for air circulation.

The fan (blower) 13 is arranged inside the air passage 15. Specifically, it is arranged between the corner vanes 26d and the corner vanes 26a. The fan 13 sends air from the corner vane 26d toward the corner vane 26a, so that the corner vane 26a, the corner vane 26b, the air outlet 22, the measuring chamber 17, the suction port 20, the corner vane 26c, and the corner vane 26d are in this order. Jet air 30, which is a flow of air circulating between the air passage 15 and the measurement chamber 17, is formed.

Further, the wind tunnel test device 10 is an air cooling device between the air outlet 22 and the corner vane 26b, that is, in the flow direction of the jet air 30, on the downstream side of the fan 13 and on the upstream side of the air outlet 22. It includes a heat exchanger) 28 and a rectifying unit 29. The rectifying unit 29 is arranged on the downstream side of the air cooling device 28. The air cooling device 28 adjusts the temperature of the jet air 30 supplied to the measuring chamber 17. The rectifying unit 29 has, for example, a rectifying wire mesh and a rectifying grid, and rectifies the flowing jet air 30. By rectifying with the rectifying unit 29, the jet air 30 supplied from the air outlet 22 to the blowout measurement chamber 17 can be rectified.

The fluctuating wind generator 100 is arranged at the air outlet 22 of the air passage 15. Specifically, the fluctuating wind generator 100 is arranged on the downstream side of the rectifying unit 29 and on the upstream side of the measurement region 27 in the wind flow direction. The fluctuating wind generator 100 generates fluctuating wind in which the flow in the flow direction of the jet air 30 and the flow in the direction orthogonal to the flow of the jet air 30 change. The fluctuating wind generator 100 will be described later.

The wind tunnel test device 10 drives a fan (blower) 13 to form an air flow in the wind tunnel 12. Specifically, the fan 13 forms a flow of jet air 30 flowing in one direction in the air passage 15, so that the air in the measurement chamber 17 is collected from the suction port 20 and passed through the air passage 15. After being rectified by the rectifying unit 29, the jet air 30 can be blown out from the air outlet 22 to the measuring chamber 17 through the fluctuating wind generator 100. As a result, the jet air 30 can be blown onto the vehicle 8 in the measurement area 27. The wind tunnel test device 10 can adjust the wind speed of the jet air 30 blown to the measurement area 27 by the fan 13. The wind tunnel test device 10 can adjust the flow of the jet air 30 blown to the measurement region 27 in the wind flow direction and the flow in the direction orthogonal to the wind flow by the fluctuating wind generator 100.

The wind tunnel test device 10 installs the vehicle 8 in the measurement area 27 of the measurement chamber 17, further installs the measurement equipment, and measures various measurement parameters in a state where the jet air 30 is blown onto the vehicle 8, thereby distributing the wind speed. , Noise, etc. can be tested.

In the wind tunnel test apparatus 10, the wind speed may be controlled by limiting the fan suction flow rate by the inlet guide vane, limiting the fan discharge flow rate by the damper, controlling the flow rate by the variable pitch of the fan 13, and the like.

Next, the fluctuating wind generator 100 will be described with reference to FIGS. 2 to 6 in addition to FIG. FIG. 2 is a cross-sectional view showing a schematic configuration of a fluctuating wind generator. FIG. 3 is a schematic view showing a part of the fluctuating wind generator in an enlarged manner. 4 to 6 are cross-sectional views showing an example of the shape of each wing.

As shown in FIGS. 2 and 3, the fluctuating wind generator 100 includes a plurality of blade units 102 and a control device 104. The blade unit 102 includes a blade 110, a rotation shaft 112, and an individual drive unit 114. The wing unit 102 has the same structure except that the arrangement position is different. In this embodiment, the plurality of wing units 102 are arranged side by side along one surface of the air outlet 22. In the fluctuating wind generator 100, as shown in FIG. 2, the blades 110 are arranged in a row over the entire area of the air outlet 22 of the air passage 15. The wings 110 of this embodiment are arranged at the same intervals.

As shown in FIG. 4, the blade 110 has a shape in which the length in the flow direction of the jet air 30 is longer than the length in the direction orthogonal to the flow direction of the jet air 30 in the cross section orthogonal to the rotation axis. As will be described later, the blade 110 rotates to change its orientation, and FIG. 4 shows a state in which the long axis of the blade 110 is arranged along the length of the jet air 30 in the flow direction. There is. Further, the wing 110 has a shape in which the thickness in the arrangement direction becomes thicker as the thickness increases away from the end portion. Specifically, the blade 110 has a shape in which the thickness of the end portion of the jet air 30 in the flow direction is the thinnest, and the thickness increases from the end portion toward the center. The blade 110 has a diamond shape in which the shape of the cross section orthogonal to the rotation axis 112 is a diagonal line in which the flow direction of the jet air 30 is long and a diagonal line in which the direction orthogonal to the flow direction of the jet air 30 is short. The blade 110 of the present embodiment has a symmetrical shape with respect to a surface 130 that passes through the rotation shaft 112 and is parallel to the flow direction of the jet air 30. Further, the blades 110, 110a, 110b have a symmetrical shape about a plane 132 that passes through the rotation shaft 112 and is parallel to the direction orthogonal to the flow direction of the jet air 30. The wing 110 has a rotation shaft 112 provided at the center of the rhombus. The wing 110 may have a diamond-shaped corner as a curved surface.

The shape of the wing 110 is not limited to the shape shown in FIG. 5 and 6 are cross-sectional views showing an example of the shape of the wing, respectively. The blade 110a shown in FIG. 5 has a shape in which a surface along the flow direction of the jet air 30 is a curved surface (arc) that is convex in a direction orthogonal to the flow direction of the jet air 30. The blade 110b shown in FIG. 6 has a hexagonal cross section orthogonal to the rotation axis. The blade 110b has a shape in which a corner portion in a direction orthogonal to the flow direction of the diamond-shaped jet air 30 shown in FIG. 4 is cut off, and a region including the center of the flow direction of the jet air 30 is formed with the flow direction of the jet air 30. Parallel sides are provided.

The blades 110, 110a, 110b of the present embodiment have a symmetrical shape about a plane that passes through the rotation shaft 112 and is parallel to the flow direction of the jet air 30. Further, the blades 110, 110a, 110b have a symmetrical shape with a plane parallel to the direction orthogonal to the flow direction of the jet air 30 passing through the rotation shaft 112 as an axis.

The rotation shaft 112 is fixed to the blade 110. The rotation shaft 112 serves as a shaft for rotating the blade 110. The individual drive unit 114 rotates the rotation shaft 112. The individual drive unit 114 is, for example, a servomotor, and rotates the rotation shaft 112 by the angle of the input signal in the direction based on the input signal. The individual drive unit 114 provides an encoder on the rotating shaft 112, detects the direction of the rotating shaft 112, rotates the rotating shaft 112 based on the result, and directs the rotating shaft 112 and the blade 110 to a predetermined direction. May be. The individual drive unit 114 of each blade unit 102 serves as the drive unit 106 of the fluctuating wind generator 100.

The control device 104 controls the operation of the individual drive unit 114 of the blade unit 102, and controls the orientation of each blade 110. Specifically, the control device 104 has three blades: that the adjacent blades 110 are rotated in the same phase, that the adjacent blades 110 are rotated in the opposite phase, and that the blades 110 are not rotated. Various fluctuating winds are supplied to the measurement region 27 by driving in combination with the position and timing of.

Hereinafter, an example of the fluctuating wind that can be realized by the fluctuating wind generator 100 will be described with reference to FIGS. 7 to 14. The operations shown in FIGS. 7 to 14 can be executed by the control device 104 controlling the operation of the individual drive unit 114.

FIG. 7 is an explanatory diagram showing an example of the operation of the fluctuating wind generator. In the case of the example shown in FIG. 7, in the control device 104, first, the line connecting all the blades 110 at the longitudinal end of the blade 110 and both ends in the flow direction of the jet air 30 is orthogonal to the arrangement direction of the blades. (Step S12). As a result, the jet air 30 in the same direction as the upstream side of the fluctuating wind generator 100 is supplied to the measurement region. Next, the control device 104 rotates all the wings 110 in the same direction. Specifically, the blade 110 is rotated in a direction in which the downstream end in the flow direction of the jet air 30 is in the right direction when viewed from the vehicle (step S14). As a result, the direction of the jet air 30 supplied to the measurement region is tilted from the center to the right.

Next, the control device 104 rotates all the wings 110 in the same direction. Specifically, the downstream end of the jet air 30 in the flow direction is rotated in the direction to the left when viewed from the vehicle. That is, it is rotated in the direction opposite to the direction in which it is rotated from step S12 to the position of step S14. As a result, all the blades 110 rotate in the same direction and become orthogonal to the arrangement direction of the blades in the same direction as in step S12 (step S16). As a result, the direction of the jet air 30 supplied to the measurement region is tilted from the right to the center, and in step S16, the direction is the same as that of the jet air 30 on the upstream side of the fluctuating wind generator 100.

Next, the control device 104 rotates all the wings 110 in the same direction. Specifically, the downstream end of the jet air 30 in the flow direction is rotated in the direction to the left when viewed from the vehicle. That is, it is rotated in the same direction as the rotation from step S14 to the position of step S16. As a result, the end of the blade 110 on the downstream side in the flow direction of the jet air 30 is rotated in the direction to the left when viewed from the vehicle (step S18). As a result, the direction of the jet air 30 supplied to the measurement region is tilted from the center to the left. Next, the control device 104 rotates all the wings 110 in the same direction. Specifically, the end portion on the downstream side in the flow direction of the jet air 30 is rotated in the direction to the right when viewed from the vehicle. That is, it is rotated in the direction opposite to the direction in which it is rotated from step S16 to the position of step S18. As a result, all the blades 110 rotate in the same direction and become orthogonal to the arrangement direction of the blades in the same direction as in step S12 (step S20).

The fluctuating wind generator 100 changes the direction of the jet air 30 supplied to the measurement region in the left-right direction when the jet air 30 supplied to the measurement region is viewed from the vehicle by repeating the processes from step S12 to step S18 with step S12 and step S20 as the same process. It can be a flow. Thereby, for example, the conditions for testing the influence of the crosswind on the vehicle 8 can be reproduced.

Next, FIG. 8 is an explanatory diagram showing an example of the operation of the fluctuating wind generator. In the case of the example shown in FIG. 8, in the control device 104, first, the line connecting all the blades 110 at the longitudinal end of the blade 110 and both ends in the flow direction of the jet air 30 is orthogonal to the arrangement direction of the blades. (Step S32). As a result, the jet air 30 in the same direction as the upstream side of the fluctuating wind generator 100 is supplied to the measurement region. Next, the control device 104 rotates all the blades 110 in the opposite direction to the adjacent blades 110 (step 34, step S36, step S38). That is, the control device 104 rotates two adjacent blades 110 in opposite directions. In the present embodiment, rotating two adjacent blades 110 in opposite directions is said to rotate in opposite phases. Here, in the present embodiment, the two blades 110 that are rotated in opposite phases rotate in a direction in which the downstream end in the flow direction of the jet air 30 approaches. As a result, the resistance can be increased while reducing the turbulence generated in the jet air 30. The rotation direction may be opposite. Further, in the present embodiment, rotating two adjacent blades 110 in the same direction is said to rotate in the same phase. In the fluctuating wind generator 100, the blades 110 rotate in opposite phases from positions parallel to each other, so that the distance between the blades 110 becomes shorter when viewed from the upstream side to the downstream side in the flow direction of the jet air 30. .. That is, in the fluctuating wind generator 100, the angle of the blade 110 with respect to the flow direction of the jet air 30 increases, so that the resistance when the blade 110 passes increases. As a result, as shown in step S32, step 34, step S36, and step S38, as the angle of the blade 110 with respect to the flow direction of the jet air 30 increases, the flow velocity of the jet air 30 decreases and the flow rate decreases.

Next, in step S38, the control device 104 rotates the blade 110 to the end of the rotation range of the blade 110, and then reverses the rotation direction of each blade 110. As a result, the control device 104 rotates all the blades 110 from step S32 in the direction opposite to step S38 and in the direction opposite to the adjacent blades 110 (step S40, step S42, step S44). As a result, the fluctuating wind generator 100 is viewed from the upstream side to the downstream side in the flow direction of the jet air 30 by rotating the blade 110 in the opposite phase toward the parallel direction from the end of the rotation range. Sometimes the distance between the wings 110 increases. That is, in the fluctuating wind generator 100, the angle of the blade 110 with respect to the flow direction of the jet air 30 is reduced, so that the resistance of the blade 110 when passing through is reduced. As a result, as shown in step S38, step 40, step S44, and step S46, as the angle of the blade 110 with respect to the flow direction of the jet air 30 decreases, the flow velocity of the jet air 30 increases and the flow rate increases.

The fluctuating wind generator 100 can increase or decrease the flow velocity and flow rate of the jet air 30 supplied to the measurement region by repeating the processes of steps S32 and S46. Thereby, for example, the conditions for testing the influence of the front-rear wind change on the vehicle 8 can be reproduced.

In the example shown in FIG. 8, all the blades 110 are rotated in the opposite phase, but some blades 110 may be rotated in the opposite phase. FIG. 9 is an explanatory diagram showing an example of the operation of the fluctuating wind generator. In the example shown in FIG. 9, in the control device 104, the line connecting all the blades 110 at the longitudinal end of the blades 110 and both ends in the flow direction of the jet air 30 is oriented so as to be orthogonal to the arrangement direction of the blades 110. (Step S52). As a result, the jet air 30 in the same direction as the upstream side of the fluctuating wind generator 100 is supplied to the measurement region. Next, the control device 104 reverses the wing 110 included in the area 140 including the horizontal end portion on the right side of the area where the vehicle 8 is arranged when viewed from the vehicle 8 with the adjacent wing 110. Rotate in the direction (step S54). That is, the control device 104 rotates the blade 110 included in the region 140 in a direction opposite to that of the adjacent blade 110. The blade 110 not included in the region 140, that is, the remaining blade 110, is maintained so that the line connecting both ends in the longitudinal direction of the blade 110 and both ends in the flow direction of the jet air 30 is orthogonal to the arrangement direction of the blade 110. To do. As a result, the resistance of the blade 110 in the region 140 becomes larger than the resistance of the blade 110 in the other region. As a result, the flow velocity and flow rate of the jet air 30 flowing in the region 140 decrease, and the flow velocity and flow rate of the jet air 30 flowing in the region adjacent to the region 140, that is, the region where the vehicle 8 is arranged increases. In this way, as the jet air 30 becomes difficult to flow into the region 140, the jet air 30 flowing into the region adjacent to the region 140 increases, and the flow velocity of the jet air 30 flowing into the region where the vehicle 8 is arranged increases. , The flow rate increases. At this time, the flow velocity of the blade 110 adjacent to the region 140 becomes the fastest (the increase increases), and the flow velocity decreases as the distance increases (the increase decreases).

When the control device 104 rotates the blade 110 to the end of the rotation range of the blade 110 in the region 140 in step S54, the control device 104 reverses the rotation direction of each blade 110 in the region 140 (step S56). As a result, in the fluctuating wind generator 100, the blade 110 in the region 140 rotates in the opposite phase toward the end of the rotation range in the parallel direction, so that the resistance of the blade 110 in the region 140 gradually decreases. Become. In the control device 104, the line connecting the blade 110 of the region 140 at the end in the longitudinal direction of the blade 110 and both ends in the flow direction of the jet air 30 is oriented so as to be orthogonal to the arrangement direction of the blade 110. As a result, the resistance between the blades 110 becomes the same, and the flow velocity in the arrangement direction of the blades 110 becomes constant.

Next, FIG. 10 is an explanatory diagram showing an example of the operation of the fluctuating wind generator. In the example shown in FIG. 10, in the control device 104, the line connecting all the blades 110 at the longitudinal end of the blades 110 and both ends in the flow direction of the jet air 30 is oriented so as to be orthogonal to the arrangement direction of the blades 110. (Step S62). As a result, the jet air 30 in the same direction as the upstream side of the fluctuating wind generator 100 is supplied to the measurement region. Next, the control device 104 reverses the wing 110 included in the region 142 including the horizontal end on the left side of the region where the vehicle 8 is arranged when viewed from the vehicle 8 with the adjacent wing 110. Rotate in the direction (step S64). That is, the control device 104 rotates the blade 110 included in the region 142 in a direction opposite to that of the adjacent blade 110. The blade 110 not included in the region 142, that is, the remaining blade 110, is maintained so that the line connecting both ends in the longitudinal direction of the blade 110 and both ends in the flow direction of the jet air 30 is orthogonal to the arrangement direction of the blade 110. To do. As a result, the resistance of the blade 110 in the region 142 becomes larger than the resistance of the blade 110 in the other region. As a result, the flow velocity and flow rate of the jet air 30 flowing in the region 142 decrease, and the flow velocity and flow rate of the jet air 30 flowing in the region adjacent to the region 142, that is, the region where the vehicle 8 is arranged increases. As described above, as the jet air 30 becomes difficult to flow into the region 142, the jet air 30 flowing into the region adjacent to the region 142 increases, and the flow velocity of the jet air 30 flowing into the region where the vehicle 8 is arranged increases. , The flow rate increases. At this time, the flow velocity of the blade 110 adjacent to the region 142 becomes the fastest (the increase increases), and the flow velocity decreases as the distance increases (the increase decreases).

Next, in step S64, the control device 104 rotates the blade 110 to the end of the rotation range of the blade 110 in the region 142, and then reverses the rotation direction of each blade 110 in the region 142 (step S66). .. As a result, in the fluctuating wind generator 100, the blade 110 of the region 142 rotates in the opposite phase from the end of the rotation range toward the parallel direction, so that the resistance of the blade 110 of the region 142 gradually decreases. Become. In the control device 104, the line connecting the blade 110 of the region 142 at the longitudinal end of the blade 110 and both ends in the flow direction of the jet air 30 is oriented so as to be orthogonal to the arrangement direction of the blade 110. As a result, the resistance between the blades 110 becomes the same, and the flow velocity in the arrangement direction of the blades 110 becomes constant.

As shown in FIGS. 9 and 10, only the blades 110 of the regions 140 and 142 at one end in the arrangement direction of the blades 110 are rotated in opposite phases, and the remaining blades 110 are fixed to the vehicle 8. It is possible to reproduce the conditions when the oncoming vehicle and the oncoming vehicle pass each other.

Further, in FIGS. 9 and 10, only the blade 110 included in the region of the end portion in the arrangement direction of the blade 110 is rotated in the opposite phase, but the region of the blade 110 to be rotated may be other than the end portion. For example, the control device 104 may have the wing 110 on the central side in the arrangement direction of the wing 110 on which the vehicle 8 is arranged as the opposite phase. Further, the control device 104 may alternately provide a region for rotating the blade 110 in the opposite phase and a region for fixing the blade. Further, the control device 104 may rotate the blades at the ends in opposite phases to fix the blades at the center. Further, the control device 104 may fix the wing at the end and rotate the wing at the center in opposite phase.

Further, the fluctuating wind generator 100 may rotate some blades in the opposite phase and the remaining blades in the same phase. FIG. 11 is an explanatory diagram showing an example of the operation of the fluctuating wind generator. In the case of the example shown in FIG. 11, in the control device 104, first, the line connecting all the blades 110 at the longitudinal end of the blade 110 and both ends in the flow direction of the jet air 30 is the arrangement direction of the blade 110. The directions are orthogonal to each other (step S72). As a result, the jet air 30 in the same direction as the upstream side of the fluctuating wind generator 100 is supplied to the measurement region. Next, the control device 104 rotates the wing 110 included in the region 152 at one end in the arrangement direction of the wing 110 and the region 154 at the other end in opposite phases, and the region 152 and the region 154 rotate. The blade 110 of the region 156 that is sandwiched and includes the center in the arrangement direction is rotated in the same phase (step S74). The region 156 has a measurement region on the downstream side in the flow direction of the jet air 30. The wing 110 of the region 156 is rotated so that the end on the downstream side in the flow direction of the jet air 30 is in the right direction when viewed from the vehicle. As a result, the direction of the jet air 30 supplied to the measurement region is inclined from the center to the right, the flow rate is increased, and the flow velocity is increased.

Next, the control device 104 reverses the rotation directions of all the blades 110 so that all the blades 110 are oriented orthogonal to the arrangement direction of the blades 110 in the same manner as in step S72 (step S76). As a result, the direction of the jet air 30 supplied to the measurement region is the same as that of the jet air 30 on the upstream side of the fluctuating wind generator 100, and the flow velocity and flow rate supplied are also the same as those of the other regions.

Next, the control device 104 rotates the blade 110 included in the region 152 and the region 154 in the opposite phase, and rotates the blade 110 in the region 156 in the same phase (step S78). The wing 110 of the region 156 is rotated so that the end on the downstream side in the flow direction of the jet air 30 is in the left direction when viewed from the vehicle. As a result, the direction of the jet air 30 supplied to the measurement region is tilted from the center to the left, the flow rate is increased, and the flow velocity is increased.

Next, the control device 104 reverses the rotation directions of all the blades 110 so that all the blades 110 are oriented orthogonal to the arrangement direction of the blades 110 in the same manner as in step S72 (step S79). As a result, the direction of the jet air 30 supplied to the measurement region is the same as that of the jet air 30 on the upstream side of the fluctuating wind generator 100, and the flow velocity and flow rate supplied are also the same as those of the other regions.

By combining the rotations of the opposite phase and the same phase in this way, the fluctuating wind generator 100 can reproduce the conditions when a sudden cross wind is generated for the vehicle 8.

FIG. 12 is an explanatory diagram showing an example of the operation of the fluctuating wind generator. In the case of the example shown in FIG. 12, in the control device 104, first, the line connecting all the blades 110 at the longitudinal end of the blade 110 and both ends in the flow direction of the jet air 30 is orthogonal to the arrangement direction of the blades. (Step S82). As a result, the jet air 30 in the same direction as the upstream side of the fluctuating wind generator 100 is supplied to the measurement region. Next, the control device 104 rotates the region 162 on one end side (right side when viewed from the vehicle 8) from the center of the blade 110 in the arrangement direction in opposite phase, and rotates the region 162 from the center of the blade 110 in the arrangement direction to the other end side (vehicle). The blade 110 of the region 164 in the region 164 (left side when viewed from 8) is rotated in the same phase (step S84). The wing 110 of the region 164 is rotated so that the end on the downstream side in the flow direction of the jet air 30 is in the right direction when viewed from the vehicle. As a result, the direction of the jet air 30 that has passed through the region 164 is tilted from the center to the right, the flow rate is increased, and the flow velocity is increased.

Next, the control device 104 reverses the rotation directions of all the blades 110 so that all the blades 110 are oriented orthogonal to the arrangement direction of the blades 110 in the same manner as in step S82 (step S86). As a result, the direction of the jet air 30 supplied to the measurement region is the same as that of the jet air 30 on the upstream side of the fluctuating wind generator 100, and the flow velocity and flow rate supplied are also the same as those of the other regions.

Next, the control device 104 rotates the blade 110 of the region 164 in the opposite phase, and rotates the blade 110 of the region 162 in the same phase (step S88). The wing 110 of the region 162 is rotated so that the end on the downstream side in the flow direction of the jet air 30 is in the left direction when viewed from the vehicle. As a result, the direction of the jet air 30 that has passed through the region 162 is tilted from the center to the left, the flow rate is increased, and the flow velocity is increased.

Next, the control device 104 reverses the rotation directions of all the blades 110 so that all the blades 110 are oriented orthogonal to the arrangement direction of the blades 110 in the same manner as in step S82 (step S89). As a result, the direction of the jet air 30 supplied to the measurement region is the same as that of the jet air 30 on the upstream side of the fluctuating wind generator 100, and the flow velocity and flow rate supplied are also the same as those of the other regions.

By combining the rotations of the opposite phase and the same phase in this way, the fluctuating wind generator 100 can reproduce the conditions when a sudden cross wind is generated for the vehicle 8. The operation pattern shown in FIG. 12 can blow more wind to the side surface of the vehicle 8 than the pattern shown in FIG.

FIG. 13 is an explanatory diagram showing an example of the operation of the fluctuating wind generator. FIG. 13 is an explanatory diagram showing an example of the operation of the fluctuating wind generator. In the case of the example shown in FIG. 13, in the control device 104, first, the line connecting all the blades 110 at the longitudinal end of the blade 110 and both ends in the flow direction of the jet air 30 is the arrangement direction of the blade 110. The directions are orthogonal to each other (step S92). As a result, the jet air 30 in the same direction as the upstream side of the fluctuating wind generator 100 is supplied to the measurement region. Here, the control device 104 has a region 172 at one end in the arrangement direction of the wings 110, a region 174 on the center side of the arrangement direction of the wings 110 with respect to the area 172 at one end, and the other end. The control is divided into a region 176 on the center side in the arrangement direction of the blades 110 and a region 178 at the other end in the arrangement direction of the blades 110. Regions 174 and 176 have a measurement region on the downstream side in the flow direction of the jet air 30. The control device 104 rotates the region 172 and the blade 110 included in the region 178 in the opposite phase, and rotates the region 174 and the blade 110 included in the region 176 in the same phase (step S94). The wing 110 of the region 174 is rotated so that the end on the downstream side in the flow direction of the jet air 30 is in the left direction when viewed from the vehicle. The wing 110 of the region 176 is rotated so that the end on the downstream side in the flow direction of the jet air 30 is in the right direction when viewed from the vehicle. As a result, the direction of the jet air 30 supplied to the measurement region is inclined toward the center with the center as the boundary, and the flow rate of the inclined jet air 30 is increased, so that the flow velocity is increased.

Next, the control device 104 reverses the rotation directions of all the blades 110 so that all the blades 110 are oriented orthogonal to the arrangement direction of the blades 110 in the same manner as in step S92 (step S96). As a result, the direction of the jet air 30 supplied to the measurement region is the same as that of the jet air 30 on the upstream side of the fluctuating wind generator 100, and the flow velocity and flow rate supplied are also the same as those of the other regions.

Next, the control device 104 rotates the blade 110 included in the region 172 and the region 178 in the opposite phase, and rotates the region 174 and the blade 110 included in the region 176 in the same phase (step S98). The wing 110 of the region 174 is rotated so that the end on the downstream side in the flow direction of the jet air 30 is in the right direction when viewed from the vehicle. The wing 110 of the region 176 is rotated so that the end on the downstream side in the flow direction of the jet air 30 is in the left direction when viewed from the vehicle. As a result, the direction of the jet air 30 supplied to the measurement region is inclined in a direction away from the center with the center as the boundary, and the flow rate of the inclined jet air 30 is increased, so that the flow velocity is increased.

Next, the control device 104 reverses the rotation directions of all the blades 110 so that all the blades 110 are oriented orthogonal to the arrangement direction of the blades in the same manner as in step S92 (step S99). As a result, the direction of the jet air 30 supplied to the measurement region is the same as that of the jet air 30 on the upstream side of the fluctuating wind generator 100, and the flow velocity and flow rate supplied are also the same as those of the other regions.

FIG. 14 is an explanatory diagram showing an example of the operation of the fluctuating wind generator. FIG. 14 is an explanatory diagram showing an example of the operation of the fluctuating wind generator. In the case of the example shown in FIG. 14, in the control device 104, first, the line connecting all the blades 110 at the longitudinal end of the blade 110 and both ends in the flow direction of the jet air 30 is orthogonal to the arrangement direction of the blades. (Step S102). As a result, the jet air 30 in the same direction as the upstream side of the fluctuating wind generator 100 is supplied to the measurement region. Similar to FIG. 13, the control device 104 has a region 172 at one end, a region 174 closer to the center of the wing 110 in the arrangement direction than the region 172 at one end, and a wing 110 than the other end. Control is performed separately for the region 176 on the center side in the arrangement direction of the above and the region 178 at the other end. Regions 174 and 176 have a measurement region on the downstream side in the flow direction of the jet air 30. The control device 104 rotates the region 174 and the blade 110 included in the region 176 in opposite phases, and rotates the region 172 and the blade 110 included in the region 178 in the same phase (step S104). The wing 110 of the region 172 is rotated so that the end on the downstream side in the flow direction of the jet air 30 is in the left direction when viewed from the vehicle. The wing 110 of the region 178 is rotated so that the end on the downstream side in the flow direction of the jet air 30 is in the right direction when viewed from the vehicle. As a result, the jet air 30 supplied to the measurement region is supplied with the jet air 30 having a slow flow velocity from the center, tilting from both ends toward the center, increasing the flow rate, and supplying the jet air 30 having a high flow velocity. Will be done.

Next, the control device 104 reverses the rotation directions of all the blades 110 so that all the blades 110 are oriented orthogonal to the arrangement direction of the blades 110 in the same manner as in step S102 (step S106). As a result, the direction of the jet air 30 supplied to the measurement region is the same as that of the jet air 30 on the upstream side of the fluctuating wind generator 100, and the flow velocity and flow rate supplied are also the same as those of the other regions.

Next, the control device 104 rotates the blade 110 included in the region 174 and the region 176 in the opposite phase, and rotates the region 172 and the blade 110 included in the region 178 in the same phase (step S108). The wing 110 of the region 172 is rotated so that the end on the downstream side in the flow direction of the jet air 30 is in the right direction when viewed from the vehicle. The wing 110 of the region 178 is rotated so that the end on the downstream side in the flow direction of the jet air 30 is in the left direction when viewed from the vehicle. As a result, the jet air 30 supplied to the measurement region is supplied with the jet air 30 having a slow flow velocity from the center. Further, the jet air 30 discharged from the regions 182 and 178 is not supplied to the measurement region because it is inclined in a direction away from the measurement region.

Next, the control device 104 reverses the rotation directions of all the blades 110 so that all the blades 110 are oriented orthogonal to the arrangement direction of the blades 110 in the same manner as in step S102 (step S109). As a result, the direction of the jet air 30 supplied to the measurement region is the same as that of the jet air 30 on the upstream side of the fluctuating wind generator 100, and the flow velocity and flow rate supplied are also the same as those of the other regions.

By combining the rotations of the opposite phase and the same phase in this way, the fluctuating wind generator 100 can make various flows of air to be blown to the vehicle, that is, to flow in the measurement region.

Further, the fluctuating wind generator 100 may rotate some blades in the opposite phase, rotate some blades in the same phase, and fix the remaining blades. Further, the fluctuating wind generator 100 may rotate some blades in the same phase to fix the remaining blades. As described above, the fluctuating wind generator 100 can reproduce various modes by having a structure capable of individually controlling the rotation of the blades.

Further, the fluctuating wind generator 100 may rotate some blades in opposite phases so as not to rotate the remaining blades. Further, the fluctuating wind generator 100 may sequentially switch between an operation in which some blades are rotated in the opposite phase and the remaining blades are not rotated, and an operation in which all the blades are moved in the same phase. FIG. 15 is an explanatory diagram showing an example of the operation of the fluctuating wind generator. In the case of the example shown in FIG. 15, in the control device 104, first, the line connecting all the blades 110 at the longitudinal end of the blade 110 and both ends in the flow direction of the jet air 30 is the arrangement direction of the blade 110. The directions are orthogonal to each other (step S112). As a result, the jet air 30 in the same direction as the upstream side of the fluctuating wind generator 100 is supplied to the measurement region. Next, the control device 104 rotates the blade 110 included in the region 192 at one end in the arrangement direction of the blade 110 and the region 194 at the other end in opposite phases, and the region 192 and the region 194 rotate. The wing 110 of the region 196 that is sandwiched and includes the center in the arrangement direction is not rotated (step S114). The region 196 has a measurement region on the downstream side in the flow direction of the jet air 30. This makes it difficult for the jet air 30 to flow in the regions 192 and 194, and increases the amount of jet air flowing in the region 196. From the above, the direction of the jet air 30 supplied to the measurement region is not tilted, the flow rate is increased, and the flow velocity is increased.

Next, the control device 104 reverses the rotation direction of the blades 110 in the regions 192 and 194 so that all the blades 110 are oriented orthogonal to the arrangement direction of the blades 110 in the same manner as in step S112 (step S116). .. As a result, the direction of the jet air 30 supplied to the measurement region is the same as that of the jet air 30 on the upstream side of the fluctuating wind generator 100, and the flow velocity and flow rate supplied are also the same as those of the other regions.

Next, the control device 104 rotates all the blades 110 in the same phase (step S118). All the blades 110 are rotated so that the ends on the downstream side in the flow direction of the jet air 30 are in the right direction when viewed from the vehicle. As a result, the direction of the jet air 30 supplied to the measurement region is tilted from the center to the left.

Next, the control device 104 reverses the rotation directions of all the blades 110 so that all the blades 110 are oriented orthogonal to the arrangement direction of the blades 110 in the same manner as in step S112 (step S119). As a result, the direction of the jet air 30 supplied to the measurement region is the same as that of the jet air 30 on the upstream side of the fluctuating wind generator 100, and the flow velocity and flow rate supplied are also the same as those of the other regions.

In this way, the fluctuating wind generator 100 can reproduce the conditions when a sudden strong wind is generated for the vehicle 8 by combining the rotation of the opposite phase and the blades that do not move.

The wind tunnel test device 10 can adjust the amount of wind and the direction of the wind supplied to the measurement region by the fluctuating wind generator 100 by providing the fluctuating wind generator 100 at the outlet 22. That is, the fluctuating wind generator 100 can perform both the damper and the blade train functions on the blade 110. As a result, the wind tunnel test device 10 does not need to be provided with two mechanisms by providing the fluctuating wind generator 100, so that the device configuration can be simplified.

The fluctuating wind generator 100 is in a state where the direction of the blades can be controlled separately by the drive unit, and the direction of each blade is controlled by the control device 104. It is possible to generate a fluctuating wind in which the flow (flow rate) and the flow in the direction orthogonal to the wind flow (wind direction) change. As a result, various patterns of wind can be supplied to the measurement region, and more test conditions can be reproduced. Further, by using each pattern as described above, the above-mentioned operating conditions can be reproduced.

Further, the fluctuating wind generator 100 has a shape in which the blade 110 becomes thicker as the thickness in the arrangement direction increases from the end portion, and is symmetrical with respect to the flow direction of the jet air 30 (the direction orthogonal to the arrangement direction of the blades). The shape enhances the function as a damper that changes the flow of the jet air 30 in the direction orthogonal to the wing arrangement direction while maintaining the function as a wing that changes the flow of the jet air 30 in the wing arrangement direction. be able to. Further, the fluctuating wind generator 100 has a wing 110 having a symmetrical shape with the flow direction of the jet air 30 as an axis, so that when the wing 110 is rotated in the same phase, the wing 110 preferably produces the jet air 30. It can be guided and a uniform flow of jet air 30 can be supplied to the measurement region.

Further, the fluctuating wind generator 100 functions as a damper when the blades 110 have a symmetrical shape with the direction orthogonal to the flow direction of the jet air 30 (arrangement direction of the blades) as an axis. Can be preferably obtained. That is, the flow of the jet air 30 in the flow direction can be controlled with higher accuracy. In addition, since the above effect can be obtained, it is preferable that the blade 110 has a symmetrical shape with the direction orthogonal to the flow direction of the jet air 30 (the arrangement direction of the blades) as an axis, but the blade 110 does not have to have a symmetrical shape. Good. For example, the position where the thickness of the blade 110 becomes thickest in the direction orthogonal to the flow direction of the jet air 30 may be deviated from the center of the flow direction of the jet air 30.

Further, the rotating shaft 112 is preferably provided at the center of the blade 110, but may be displaced in the flow direction of the jet air 30. The rotation shaft 112 is preferably fixed to the center of the blade 110 in a direction orthogonal to the flow direction of the jet air 30 (arrangement direction of the blades). As a result, when the blades are rotated in the same phase or the opposite phase, it is possible to suppress the orientation from being deviated from the other blades and to reduce the change in the interval caused by the angle of the blades.

The fluctuating wind generator 100 has a plurality of blades 110 arranged at the outlet 22 having the same shape, so that the blades 110 are positioned in the same phase and in the opposite phase, especially when they are rotated in the same phase. It is possible to suppress the occurrence of unintended flow non-uniformity. That is, it is possible to easily create a desired flow. Here, the wings 110 having the same shape may be substantially the same shape, and can be said to have the same shape even if there is a difference in shape that does not cause a difference in manufacturing error or performance.

Further, the fluctuating wind generator 100 drives the blades 110 of the blade unit 102 one by one by the individual drive units 114, but provides a link mechanism for connecting the drive units and the plurality of rotation shafts and drives them in conjunction with each other. It may be possible. In this case, the link mechanism can switch the rotation direction of the adjacent blades 110 by providing a mechanism for switching between a state in which the adjacent blades 110 are rotated in the same phase and a state in which the adjacent blades 110 are rotated in the opposite phase. In addition, one wing is provided with a clutch mechanism that switches between connecting and disconnecting two link mechanisms and the link mechanism, and wing that rotates in the same phase as the reference wing is connected by one link mechanism and rotates in the opposite phase. The wings may be connected by another link mechanism, and the non-rotating wings may be separated from both link mechanisms so that the three states can be switched.

8 Vehicle 10 Wind tunnel test equipment 12 Wind tunnel 13 Fan 15 Air passage 17 Measurement room 20 Suction port 22 Air outlet 26a, 26b, 26c, 26d Corner vane 27 Measurement area 28 Air cooling device 29 Rectifier 30 Jet air 100 Fluctuating wind generator 102 Wing unit 104 Control device 110 Wing 112 Rotating shaft 114 Individual drive unit

Claims (10)

A fluctuating wind generator located at the outlet of the air passage on the upstream side of the measurement area of the measurement chamber to which air is supplied from the air passage.
A plurality of blades arranged in a row in a direction orthogonal to the direction of wind flow in the air passage over the entire outlet of the air passage.
The drive unit that rotates the wing and
It has a control device that controls the direction of the blades and generates a fluctuating wind that changes the flow direction of the wind and the flow in the direction orthogonal to the flow of the wind.
The wing has a shape in which the thickness in the arrangement direction becomes thicker as the distance from the end portion increases, and the wing has a symmetrical shape with the direction orthogonal to the arrangement direction of the wing as an axis.
Arc shape der convex in a direction perpendicular to the flow direction of the rhombic shape or the wind is,
In the control device, from a state in which the line connecting the end portions in the longitudinal direction of all the blades is in a direction orthogonal to the arrangement direction of the blades, at least the end portions in the arrangement direction among the plurality of the blades are used. Two adjacent blades are rotated in opposite directions and the remaining blades are fixed in the same direction, after which the line connecting the longitudinal ends of all the blades is orthogonal to the arrangement direction of the blades. A fluctuating wind generator characterized by having an operation mode in which it is oriented. A fluctuating wind generator located at the outlet of the air passage on the upstream side of the measurement area of the measurement chamber to which air is supplied from the air passage.
A plurality of blades arranged in a row in a direction orthogonal to the direction of wind flow in the air passage over the entire outlet of the air passage.
The drive unit that rotates the wing and
It has a control device that controls the direction of the blades and generates a fluctuating wind that changes the flow direction of the wind and the flow in the direction orthogonal to the flow of the wind.
The wing has a shape in which the thickness in the arrangement direction becomes thicker as the distance from the end portion increases, and the wing has a symmetrical shape with the direction orthogonal to the arrangement direction of the wing as an axis.
A rhombus or an arc that is convex in the direction orthogonal to the direction of wind flow.
In the control device, at least two adjacent blades out of a plurality of blades are connected to each other from a state in which the line connecting the ends in the longitudinal direction of all the blades is in a direction orthogonal to the arrangement direction of the blades. Rotate in the opposite direction and rotate the remaining wings in the same direction, after which the line connecting the ends of all the wings in the longitudinal direction is in the direction orthogonal to the arrangement direction of the wings. fluctuations wind generator you further comprising a mode of operation state. The fluctuating wind generator according to claim 1 or 2 , wherein the blades have a symmetrical shape with the arrangement direction of the blades as an axis. The drive unit, an individual drive unit for driving one of said wings, variations air generating device according to claim 1, characterized in that it comprises for each of a plurality of said blades in any one of claims 3. The fluctuating wind generator according to any one of claims 1 to 4 , wherein the plurality of blades all have the same shape. The fluctuating wind generator according to any one of claims 1 to 5 , wherein the drive unit rotates about the center of the blade in the flow direction. The fluctuating wind generator according to any one of claims 1 to 6 , wherein the control device includes an operation mode in which adjacent blades are rotated in opposite directions. The fluctuating wind generator according to any one of claims 1 to 7.
A wind tunnel test apparatus comprising a measuring chamber to which the fluctuating wind generator is connected. A plurality of blades arranged in a row in a direction orthogonal to the wind flow direction in the air passage over the entire area of the outlet of the air passage on the upstream side of the measurement area of the measurement chamber to which air is supplied from the air passage. It is a fluctuating wind generation method that controls the direction and generates fluctuating wind in the measurement area.
From a state in which the line connecting the ends in the longitudinal direction of all the blades is in a direction orthogonal to the arrangement direction of the blades, at least two adjacent blades at the ends in the arrangement direction among the plurality of the blades. Is rotated in the opposite direction to fix the remaining wings in the same direction, and then all the wings are in a state in which the line connecting the ends in the longitudinal direction is orthogonal to the arrangement direction of the wings. ,
The blade has a shape that becomes thicker as the thickness in the arrangement direction is farther from the end, has a symmetrical shape about a direction orthogonal to the arrangement direction of the blade, and is convex in a rhombus shape or a direction orthogonal to the wind flow direction. A method of generating fluctuating wind, which is characterized by having an arc shape. A plurality of blades arranged in a row in a direction orthogonal to the wind flow direction in the air passage over the entire area of the outlet of the air passage on the upstream side of the measurement area of the measurement chamber to which air is supplied from the air passage. It is a fluctuating wind generation method that controls the direction and generates fluctuating wind in the measurement area.
From the state in which the line connecting the ends in the longitudinal direction of all the blades is in the direction orthogonal to the arrangement direction of the blades, at least two adjacent blades among the plurality of blades are oriented in opposite directions to each other. Rotate and rotate the remaining wings in the same direction, after which all the wings are in a state in which the line connecting the ends in the longitudinal direction is orthogonal to the arrangement direction of the wings.
The blade has a shape that becomes thicker as the thickness in the arrangement direction is farther from the end, has a symmetrical shape about a direction orthogonal to the arrangement direction of the blade, and is convex in a rhombus shape or a direction orthogonal to the wind flow direction. A method of generating fluctuating wind, which is characterized by having an arc shape.

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