JPH0637310Y2 - Circulating wind tunnel device with multiple measuring cylinders - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a wind tunnel device for measuring a wind tunnel.

[Conventional technology]

Conventionally, as shown in FIG. 2, there is known a wind tunnel device in which an axial flow type blower 6 is installed in a flow passage 1 and one measuring cylinder 43 is installed in the flow passage 1 on the downstream side of the blower 6. ing.

The wind tunnel device is provided with a blower 6 designed so that static pressure, wind speed, etc. can be adjusted within a predetermined range with respect to one measuring cylinder 43.

[Problems to be solved by the device]

Since the wind tunnel device shown in FIG. 2 is provided with the blower 6 capable of adjusting the static pressure, wind speed, etc. for one measuring cylinder in a predetermined range, the static pressure, wind speed, etc. can be changed significantly. Was difficult.

Therefore, it is necessary to separately provide a wind tunnel device that can measure the measurement conditions for the measurement under different measurement conditions that cannot be measured by the wind tunnel device.

The present invention has been made in view of the above matters, and an technical object thereof is to provide a wind tunnel device capable of performing wind tunnel measurement in which measurement conditions such as static pressure and wind speed are greatly different.

[Means for Solving the Problems]

In the present invention, the first measuring cylinder 14 and the second measuring cylinder 30 are provided in the flow path 1 of the wind tunnel device having one blower as in the conventional case, and one of them has a large cross-sectional area and the other has a small cross-sectional area. On the other hand, it is possible to measure the low wind speed of the large test piece on the one hand and the high wind speed of the small test piece on the other hand.

[Action]

The present invention, when measuring low wind speed on a large specimen,
Use a measuring cylinder with a large cross section. When measuring a high wind speed with a small specimen, use a measuring cylinder with a small cross-sectional area.

This will be explained using the wind tunnel device shown in FIG. 1. When measuring a low wind speed with a large specimen, the large specimen is used as the first measuring cylinder 14
The air blower 6 blows air to measure.

Further, when measuring a high wind speed with a small test piece, the small test piece is installed on the second measuring cylinder 30 and blown by the blower 6 to perform the measurement.

Then, even if the blower 6 can adjust the amount of blown air in a small range, it is possible to measure in a wide range of measurement conditions by selecting a large or small cross-sectional area of the measuring cylinder.

〔Example〕

FIG. 1 shows an embodiment of the present invention and shows a wind tunnel device having a plurality of measuring cylinders for one fan.

In this embodiment, the cross-sectional shape of the wind tunnel device differs depending on the position of the flow path, but in the flow path 1, a supply port 2 for taking in air from the outside of the wind tunnel device and a supply port for opening / closing this supply port 2 are provided. An air door 3 is provided.

An axial blower 6 is installed in the downstream flow passage 1 following the air supply port 2, and a first diffusion cylinder 9 is installed in the downstream flow passage 1 following the blower 6. The first rectifying cylinder 10 is installed after the first diverging cylinder 9.
After 10 is installed the first contraction flow 11.

Then, the air blown from the blower 6 is slowed down by the first diffusion cylinder 9, rectified by a rectification device such as a wire mesh by the first rectification cylinder 10, and speeded up by the first contraction cylinder 11 with little disturbance. To be done.

A first measuring cylinder 14 having a large cross-sectional area is installed in the flow path 1 on the downstream side following the first contracting cylinder 11.
A first bending drum 17 is installed in the downstream flow passage 1 following the above, and the first bending drum 17 is formed so as to change the flow direction of the flow passage 1 without disturbing the flow of the air. There is. Then, the above-mentioned flow path 1 is formed from the air supply port 2 to the first bending cylinder 17
It is formed in a straight line up to.

A second bending cylinder 18 that changes the direction of the air flow is installed in the flow path 1 on the downstream side of the first bending cylinder 17, and the downstream flow path 1 following the second bending cylinder 18 is provided. The first exhaust port 21 capable of discharging the air passing through the first measuring cylinder 14 to the outside.
A first exhaust door 22 for opening and closing the exhaust port 21 is provided.

A second diffusion cylinder 25, a second flow straightening cylinder 26, and a second contraction cylinder 27 are sequentially installed in the downstream flow passage 1 following the first exhaust port 21.

The first flow path 1 on the downstream side following the second contraction cylinder 27 has the first
A second cross-sectional area smaller than that of the measuring cylinder 14
A measuring cylinder 30 is installed, and a second exhaust port 33 capable of discharging the air passing through the second measuring cylinder 30 to the outside is provided in the flow path 1 on the downstream side following the second measuring cylinder 30. A second exhaust door 34 for opening and closing the second exhaust port 33 is provided.

The flow path 1 is linearly formed from the first exhaust port 21 to the second exhaust port 33.

A third bending barrel 37 is installed in the downstream side flow passage 1 following the second exhaust port 33, and is formed so as to change the direction of the air flow.

A damper 38 capable of opening and closing the flow path 1 is installed in the flow path 1 on the downstream side of the third bending cylinder 37, and the flow path 1 on the downstream side following the damper 38 has a fourth bending cylinder 39. Has been installed,
The flow path 1 provided with the fourth bending cylinder 39 is connected to the flow path 1 provided with the air supply port 2 to form a circulation type flow path 1.

Then, the arrangement, cross-sectional area and length of the first measuring cylinder 14 and the second measuring cylinder 30 are determined so as to satisfy the measurement conditions such as static pressure and wind speed according to the purpose of the experiment, and the blower 6 also has the first measuring cylinder 14 And the static pressure, the maximum flow rate, and the flow rate control range that can obtain the wind speed satisfying the measurement conditions of the second measuring cylinder 30. Further, as the blower 6, a blower having a different type such as a centrifugal blower may be used.

In the circulation type wind tunnel device of this embodiment, the wind generated by the axial flow type blower 6 passes through the first diffusion cylinder 9 and then the first flow straightening cylinder 10,
The flow is adjusted by the first contraction flow 11 and flows into the first measuring cylinder 14. The wind further passes through the first bending cylinder 17, the second bending cylinder 18, the second diffusion cylinder 25, the flow is adjusted by the second straightening cylinder 26, the second contraction cylinder 27, and then flows into the second measuring cylinder 30. To do. Then, after that, it is returned to the inlet of the blower 6 by the third bending cylinder 37 and the fourth bending cylinder 39 and is circulated.

In the case of conducting an experiment using this example, if the test piece is a relatively large one and the wind speed is low, the test piece is installed on the first measuring cylinder 14 and blown by the blower 6 to circulate the wind. To do.

Further, in the case of a comparatively small test piece which requires a high wind speed, the test piece is installed on the second measuring cylinder 30 and wind is generated by the blower 6 and circulated.

In addition, when performing the first measurement cylinder 14 experiment while supplying foreign substances such as tracers into the wind tunnel, such as in a visualization experiment, use the damper.
38 and the second exhaust door 34 are closed, and the air supply door 3 and the first exhaust door 22 are opened.

In this case, if the blower 6 generates the wind, the wind flows from the air supply port 2 and is blown by the blower 6, passes through the first measuring cylinder 14,
It flows out from the first exhaust port 21. At the same time, foreign matter is also in the first exhaust port 21
Is discharged from the wind tunnel to the outside of the wind tunnel, and the flow path 1 on the downstream side of the first exhaust port 21
Do not enter.

Similarly, when performing the experiment while supplying foreign matter using the second measuring cylinder 30, the damper 38 and the first exhaust door 22 are closed, the air supply door 3 and the second exhaust door 34 are opened, and the blower 6 blows air. Generate.

Then, the wind flows in through the air supply port 2, is blown by the blower 6, passes through the first measuring cylinder 14 and the second measuring cylinder 30, and then passes through the second exhaust port.
Outflow from 33. At the same time, foreign matter is also discharged from the second exhaust port 33 to the outside of the wind tunnel.

[Effect of device]

According to the present invention, since the first measuring cylinder 14 and the second measuring cylinder 30 having a cross-sectional area different from that of the first measuring cylinder 14 are provided in the flow channel 1 of the wind tunnel provided with one blower 6, the static pressure of the wind, We were able to obtain a wind tunnel device with a wide range of measurement conditions such as wind speed.

Further, compared to the case where two wind tunnel devices are installed, the installation area is small, the cost is low, and the operation rate of the wind tunnel device can be increased.

[Brief description of drawings]

FIG. 1 is a plan view of a wind tunnel device having a plurality of measuring cylinders according to an embodiment of the present invention, and FIG. 2 is a plan view of a conventional wind tunnel device. 1 ... flow path, 6 ... blower, 14 ... first measuring cylinder, 30 ... second measuring cylinder

Claims (1)

[Scope of utility model registration request] 1. A single blower 6 is installed in the flow path 1, a first measuring cylinder 14 is installed in the downstream flow path 1 of the blower 6, and a flow path downstream of the first measuring cylinder 14 is provided. 1. A circulation type wind tunnel device having a plurality of measuring cylinders for one blower, which is provided with a second measuring cylinder 30 having a cross-sectional area different from that of the first measuring cylinder 14.