JP3876755B2 - Wind tunnel equipment - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a wind tunnel device, and more particularly to a wind tunnel device suitable for use in a wind tunnel having an ejector.
[0002]
[Prior art]
A wind tunnel device that generates a high Mach number airflow is an essential test facility for the development of ultra-large passenger aircraft and supersonic transport aircraft. In this type of wind tunnel device, it is common to increase the supply air pressure in order to achieve a high Mach number. It is desirable that the air storage facility for securing the air pressure is 5 MPa or less, which does not require the application of the Ministry of Health, Labor and Welfare safety regulations. Therefore, in the supersonic wind tunnel, an ejector is installed on the downstream side to reduce the air pressure shortage. Compensated by the suction effect. Then, after the generated airflow is rectified by the rectifying cylinder, a wind tunnel experiment is performed using a measuring cylinder in which a test body such as a flying object model is installed. The high-speed airflow that has passed through the measurement cylinder is decelerated by the diffusion cylinder whose channel has expanded.
[0003]
Conventionally, when a plurality of diffusion cylinders are provided in the above-described wind tunnel device, for example, when a first diffusion cylinder and a second diffusion cylinder are provided, a structure that is connected in series in the length direction or a bent portion is provided so as to be substantially L-shaped. The structure to connect to is adopted.
[0004]
[Problems to be solved by the invention]
However, the conventional wind tunnel device as described above has the following problems.
When the first and second diffusion cylinders are connected in series, the storage building becomes extremely long and obstructs the effective use of the site. Further, when a bent portion is provided and connected, the bent portion becomes an extra portion that does not contribute to performance, and the entire apparatus becomes large, resulting in a problem of increased cost and new restrictions on layout.
[0005]
The present invention has been made in consideration of the above points, and an object of the present invention is to provide a wind tunnel device that enables downsizing and effective use of a site even when a plurality of diffusion cylinders are provided.
[0006]
[Means for Solving the Problems]
In order to achieve the above object, the present invention employs the following configuration.
The wind tunnel device according to claim 1 is a wind tunnel device in which a first diffusion cylinder and a second diffusion cylinder in which a flow path expands along an advancing direction of an air flow are sequentially arranged, and the second diffusion cylinder includes the second diffusion cylinder, The flow path is formed between the first diffusion cylinder and the flow direction of the airflow reversed with respect to the first diffusion cylinder.
[0007]
Therefore, in the wind tunnel device of the present invention, since the first diffusion cylinder and the second diffusion cylinder are not connected in series, it is not necessary to enlarge the building and the site can be effectively used. Moreover, in this invention, since a 1st diffuser cylinder is used for the flow path formation which reversed the advancing direction without providing a bending part, the enlargement of an apparatus can be prevented.
[0008]
A wind tunnel device according to claim 2 is characterized in that, in the wind tunnel device according to claim 1, the first diffusion cylinder and the second diffusion cylinder are arranged substantially concentrically.
[0009]
Therefore, in the wind tunnel device of the present invention, the flow path width between the first diffusion cylinder and the second diffusion cylinder can be made constant.
[0010]
The wind tunnel device according to claim 3 is the wind tunnel device according to claim 1 or 2, wherein the second diffusion drum is spaced apart from the first diffusion drum so as to include the first diffusion drum. A flow path is formed between the first diffusion cylinder and the flow path formed outside the first diffusion cylinder , and a nozzle for introducing a fluid in a direction in which the flow path expands is provided. It is characterized by being.
[0011]
Therefore, in the wind tunnel device of the present invention, the shortage of the supply air pressure can be compensated by the suction effect when the fluid is introduced into the flow path.
[0012]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an embodiment of a wind tunnel device of the present invention will be described with reference to FIGS. 1 and 2.
FIG. 1 is a schematic configuration diagram of a wind tunnel device.
This wind tunnel device includes a high-pressure tank (storage tank) 1 that stores high-pressure gas, a heater (heat accumulator) 2 that heats high-pressure gas from the high-pressure tank 1, a rectifying cylinder 3 that rectifies the injected high-pressure gas, A sonic nozzle 4, a measuring cylinder 5 for measuring a hydrodynamic performance by installing a specimen such as a wing of a high-speed flying vehicle, a second throat 6 for reducing the flow velocity of high-pressure gas from supersonic to subsonic, subsonic The high-pressure gas flow that has been decelerated further is directly connected to the first diffusion cylinder 7, the second diffusion cylinder 8, and the second diffusion cylinder 8 to exhaust the high-pressure gas and reduce the noise level to a predetermined noise level. The muffler building 9 is mainly composed.
[0013]
The first diffusion cylinder 7 forms a channel 7a that gradually increases in diameter along the traveling direction of the high-pressure gas stream (left direction in FIG. 1), and is orthogonal to the stream near the opening of the channel 7a. An opposing wall 10 is provided along the direction. The outer peripheral portion of the facing wall 10 is connected to the second diffusion cylinder 8. The second diffusion cylinder 8 gradually increases in diameter from the facing wall 10 toward the muffler building 9 in the right direction in FIG. 1, and is spaced outside the first diffusion cylinder 7 so as to include the first diffusion cylinder 7. The high-pressure gas flow path 8 a is formed between the first diffusion cylinder 7 and the first diffusion cylinder 7. The flow path 8a is formed in a cross-sectional ring shape in which the flow path width gradually increases along the traveling direction (right side in FIG. 1) of the high-pressure gas whose traveling direction is reversed by the facing wall 10. 8 is arranged substantially concentrically with the first diffusion cylinder 7 so that the flow path width is constant along the circumferential direction.
[0014]
In addition, a plurality (for example, eight) of nozzles (headers) 11 for introducing a high-speed fluid into the flow path 8a are disposed upstream of the flow path 8a. The nozzle 11 acts as an ejector function that compensates for the shortage of the supply air pressure of the high-pressure tank 1 by the suction effect by introducing a high-speed fluid in the traveling direction of the high-pressure gas.
[0015]
In the wind tunnel device configured as described above, the high-pressure gas injected from the high-pressure tank 1 is heated to a predetermined temperature by the heater 2 and rectified by the rectifying cylinder 3, and then a high-speed fluid is introduced from the nozzle 11 to exert a suction effect. By passing through the hypersonic nozzle 4, the hypersonic speed of a high Mach number (for example, Mach 5) flows into the measurement cylinder 5. In the measurement path 5, it is possible to measure the pressure distribution generated on the surface of the specimen and observe the flow generated around the specimen.
[0016]
The high-pressure gas that has passed through the measurement cylinder 5 passes through the second throat 6, the air velocity is reduced from supersonic to subsonic, and further reduced by passing through the flow path 7 a of the first diffusion cylinder 7 that expands in diameter. Is done. Since the path of the high-pressure gas that has passed through the first diffusion cylinder 7 is blocked by the opposing wall 10, the traveling direction is bent and flows into the flow path 8 a of the second diffusion cylinder 8. Then proceed in the direction that reversed the course. In the second diffusion cylinder 8, the high-pressure gas is accelerated by an ejector action in which a high-speed fluid is introduced from the nozzle 11. However, the diameter of the high-pressure gas increases along the traveling direction and has a constant channel width. The vehicle travels to the right in the figure while being further decelerated by passing through, and flows into the muffler building 9. The flow path 8a has a ring-shaped cross section, but a predetermined ejector function can be achieved if a predetermined amount of cross-sectional area is secured. The high-pressure gas is exhausted at the noise reduction building 9 with the noise level reduced to a predetermined noise level.
[0017]
As described above, in the present embodiment, the traveling direction of the high-pressure gas is reversed, and the speed reducing flow path 8a is formed between the first diffusion cylinder 7 and the second diffusion cylinder 8, so the first diffusion cylinder Also when connecting 7 and the 2nd diffuser cylinder 8, it becomes unnecessary to connect in series or to provide a bending part. For this reason, it is possible to prevent a situation in which the building becomes large and the site cannot be effectively used, and a situation in which the entire apparatus becomes large due to the presence of the bent portion, resulting in an increase in cost and layout restrictions. Further, by arranging the first diffusion cylinder 7 and the second diffusion cylinder 8 substantially concentrically, the channel width in the channel 8a can be made constant in the circumferential direction, and a stable airflow can be formed. . Further, in the present embodiment, by installing the nozzle 11 and providing an ejector function, a high Mach number can be realized by compensating for the shortage of the supply gas pressure by the suction effect. In the present embodiment, the apparatus can be further downsized by directly connecting the second diffusion cylinder 8 and the muffler building 9.
[0018]
In the above embodiment, the position of the nozzle 11 is set on the upstream side of the flow path 8a. However, the position is not limited to this, and the nozzle 11 may be located anywhere as long as it is disposed in the flow path 8a.
[0019]
Moreover, in the said embodiment, since a flow-path cross-sectional area becomes large suddenly between the 1st diffuser cylinder 7 and the opposing wall 10, as shown in FIG. You may suppress the change of a cross-sectional area. At this time, it is preferable to provide an inclined surface on the protrusion 10a so that the high-pressure gas that has passed through the first diffusion cylinder 7 is smoothly guided to the flow path 8a.
[0020]
【The invention's effect】
As described above, according to the present invention, it is possible to prevent a situation in which a building becomes large and the site cannot be effectively used, and a situation in which the entire apparatus becomes large due to the presence of a bent portion, resulting in an increase in cost and layout restrictions. It becomes possible. Moreover, in this invention, while being able to form stable airflow, the effect that high Mach number is realizable is acquired.
[Brief description of the drawings]
FIG. 1 is a diagram showing an embodiment of the present invention, and is a schematic configuration diagram of a wind tunnel device.
FIG. 2 is a schematic configuration diagram of a wind tunnel device according to another embodiment.
[Explanation of symbols]
7 First diffusion cylinder 8 Second diffusion cylinder 8a Flow path 11 Nozzle (header)

Claims (3)

A wind tunnel device in which a first diffusion cylinder and a second diffusion cylinder in which the diameter of the flow path expands along the traveling direction of the air flow are sequentially arranged,
The said 2nd diffusion cylinder forms the said flow path which reversed the advancing direction of the said air flow with respect to the said 1st diffusion cylinder between said 1st diffusion cylinders, The wind tunnel apparatus characterized by the above-mentioned. The wind tunnel device according to claim 1, wherein
The wind tunnel device, wherein the first diffusion cylinder and the second diffusion cylinder are arranged substantially concentrically. The wind tunnel device according to claim 1 or 2,
The second diffusion cylinder is disposed at an outside of the first diffusion cylinder so as to include the first diffusion cylinder and forms a flow path between the first diffusion cylinder and the first diffusion cylinder,
A wind tunnel device, characterized in that a nozzle that introduces a fluid in a direction in which the diameter of the flow path expands is provided in a flow path formed outside the first diffusion cylinder.

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