JPH0750697Y2 - Suction type wind tunnel - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial application] The present invention relates to a suction type wind tunnel.

[Conventional technology]

The suction type wind tunnel has conventionally been, as shown in the longitudinal sectional view of FIG.
Air intake large-diameter part 7 to suck in air, straightening cylinder 8, contraction cylinder
The air is discharged to the outside of the wind tunnel by the blower 11 after passing through the measuring unit 10.

[Problems to be solved by the device]

However, in this type of wind tunnel, since the area of the air intake is large, the flow velocity of the intake air is slow, the wind speed in the measurement unit is disturbed by the influence of the surrounding outside wind, and the temperature difference between the intake air causes the air flow in the wind tunnel. There is a problem that convection occurs.

The present invention has been proposed in view of such circumstances, and an object thereof is to provide a high-performance suction-type wind tunnel that is free of convection due to turbulence of wind velocity in the measurement unit and temperature difference of air flow.

[Means for Solving the Problems]

To this end, the present invention is directed to a front end opening of the straightening cylinder in a horizontal cylindrical suction wind tunnel including a relatively large diameter straightening cylinder on the upstream side, a contraction drum, a measuring unit having a relatively small diameter, and a blower on the downstream side. A baffle plate having an area close to the area of the front end opening, provided with an appropriate axial clearance immediately before, a chamber that coaxially includes the front end opening and the baffle plate, and a coaxial at the front end center port of the chamber. And an air intake duct that is projectingly installed.

[Action]

According to this structure, since the baffle plate is provided immediately before the air intake part, the flow velocity of the air sucked from the annular clearance between the air intake part and the baffle plate increases.

In addition, air with a small temperature difference is introduced from the duct with a small suction inlet area into the chamber, and air is introduced into the wind tunnel through the gap between the air intake and baffle plate, so that the temperature of the air in the measurement section is uniform. Become.

〔Example〕

An embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a longitudinal sectional view thereof.

In the above figure, the same reference numerals as those in FIG. 2 indicate the same members as those in the figure, and a baffle plate 2 is provided immediately before the air intake part 1, and a periphery thereof is surrounded by a chamber 3.

A duct 4 is coaxially projected at the front part of the center opening of the chamber 3, and air of a uniform temperature is sucked in from a rising inlet opening 5 at the front end thereof.

If the duct inlet opening 5 is outdoors, a rain shield 6 is provided.

[Effects of the Invention] With such a structure, the following effects can be obtained.

(1) By providing a baffle plate immediately before the air intake part and increasing the flow velocity of the intake air, it is possible to reduce the influence of the outside air around and eliminate the disturbance of the wind speed in the measurement part.

(2) Further, by providing the duct and the chamber, it is possible to suck in air having a uniform temperature and prevent convection of the air current in the wind tunnel.

In short, according to the present invention, the front end opening of the straightening cylinder in a horizontal cylindrical suction type wind tunnel including a relatively large diameter straightening cylinder on the upstream side, a contraction drum, a measuring unit having a relatively small diameter and a blower on the downstream side. Is provided with an appropriate axial clearance immediately before
The baffle plate has an area close to the area of the front end opening, a chamber bar that axially encloses the front end opening and the baffle plate, and an air intake duct that is coaxially projected at the front end center opening of the chamber. As a result, a high-performance suction-type wind tunnel free from convection due to turbulence of wind speed and temperature difference of the air flow in the measuring section is obtained, and the present invention is extremely useful industrially.

[Brief description of drawings]

FIG. 1 is a vertical sectional view showing an embodiment of the present invention, and FIG. 2 is a vertical sectional view showing a conventional suction type wind tunnel. 1 ... Air intake part, 2 ... Baffle plate, 3 ... Chamber, 4 ... Duct, 5 ... Duct upper end opening, 6 ... Rain shield, 7 ... Large diameter part, 8 ... Straightening cylinder, 9 ... ... constriction cylinder, 10 ...
… Measurement section, 11 …… Blower,

Claims (1)

[Scope of utility model registration request] 1. A horizontal cylindrical suction type wind tunnel comprising a relatively large-diameter straightening cylinder, a contracting cylinder, a relatively small-diameter measuring section on the upstream side, and a blower on the downstream side, immediately before the front end opening of the straightening cylinder. A baffle plate having an area close to the area of the front end opening provided with an appropriate axial clearance, a chamber bar coaxially enclosing the front end aperture and the baffle plate, and a coaxial center of the front end center port of the chamber bar. A suction type wind tunnel characterized by having an air intake duct projecting from the.