CN103063399A - Framed bent device for wind tunnel flow field - Google Patents

Abstract

The invention discloses a rack bending device for wind tunnel flow field testing. A round steel plate is welded at one end of the round steel pipe, and a nut is welded at the other end. The screw is inserted into the round steel pipe through the nut. The screw and the nut form a spiral pair, and the head of the screw is welded with another round steel plate; the round steel pipe inside the two round steel plates Install two or more wind tunnel flow field test components with the same structure to form a bent device; two semi-circular steel hoops of each wind tunnel flow field test component with the same structure are fastened to the round steel pipe, and the Pitot tube is installed on the tube through the connector. On a semi-circular steel hoop, the total pressure hole and the static pressure hole at one end of the pitot tube are respectively connected with the pressure measuring equipment through the leather tube, and the other end of the pitot tube is a probe. The present invention can be vertically or horizontally installed at the specified position of the wind tunnel test section according to the requirements of wind tunnel flow field debugging, and the installation position of each pitot tube can be adjusted according to requirements. The device can greatly improve the accuracy and efficiency of flow field testing.

Description

Bent device for wind tunnel flow field test

technical field

The invention relates to a test device in the technical field of structural wind engineering, in particular to a frame bending device for wind tunnel flow field testing.

Background technique

The wind tunnel flow field debugging is the premise of carrying out the wind resistance research of building structures, and the wind speed distribution at different heights in the wind tunnel test section directly affects the accuracy of the wind tunnel test. The Pitot tube is the most common sensor for testing the average wind speed. The average wind speed can be obtained by using the pressure measuring equipment to test the total pressure and static pressure of the Pitot tube. However, the wind speed distribution along the height in the wind tunnel needs to be tested synchronously with multiple Pitot tubes. It is necessary to develop a device for installing multiple pitot tubes, which must not only ensure the firmness of the pitot tube installation, but also adjust according to the test requirements. It is a pity that most wind tunnels in China currently do not have a device that can be used to install multiple pitot tubes more flexibly. In the flow field debugging, the test height can only be artificially changed to obtain the wind speed distribution that is not synchronized, which seriously affects Accuracy and efficiency of flow field debugging.

Contents of the invention

The purpose of the present invention is to provide a racking device for wind tunnel flow field testing, which can be used to install multiple pitot tubes, thereby laying the foundation for carrying out flow field synchronization testing.

The technical solution adopted by the present invention to solve its technical problems is:

In the present invention, one end of the round steel pipe is vertically welded with a round steel plate, and the other end is welded with a nut coaxially. The screw is inserted into the round steel pipe through the nut. Two or more wind tunnel flow field test parts with the same structure are installed on the round steel pipe in the shaped steel plate to form a bent device; each wind tunnel flow field test part with the same structure includes: two semi-circular steel hoops and pitot tubes; two The semi-circular steel hoop is tightened on the round steel pipe by the screws at both ends to form a circular steel hoop. The vertical round steel pipe of the pitot tube is installed on a semi-circular steel hoop through the connecting piece. The total pressure hole and the static pressure hole at one end of the pitot tube They are respectively connected to the pressure measuring equipment through leather tubes, and the other end of the pitot tubes is a probe.

The number of the wind tunnel flow field test components is set according to the experimental conditions, and the distance between the wind tunnel flow field test components is set on the round steel pipes equidistantly or unequally according to the experimental conditions.

The probes of all pitot tubes have the same orientation, and the distances from the centers of all the probes to the center of the round steel tube are the same.

There are four circular holes on the circular steel plate not welded with screws, and stiffeners are welded between the circular steel plate and the circular steel pipe.

The beneficial effects of the present invention are:

The present invention can be vertically or horizontally installed at the specified position of the wind tunnel test section according to the requirements of wind tunnel flow field debugging, and the installation position of each pitot tube can be adjusted according to the test requirements. This device can greatly improve the accuracy and efficiency of flow field testing .

Description of drawings

Fig. 1 is a front view of the present invention.

Fig. 2 is A-A sectional view of the present invention.

Fig. 3 is a B-B sectional view of the present invention.

Fig. 4 is a C-C sectional view of the present invention.

Fig. 5 is a diagram of an embodiment of the present invention.

In the figure: 1. Round steel pipe, 2. Stiffener, 3. Round steel plate, 4. Nut, 5. Screw, 6. Round steel plate, 7. Two semi-circular steel hoops, 8. Screw, 9. Ring Shaped steel hoop, 10, pitot tube, 11, total pressure hole, 12, static pressure hole, 13, leather tube, 14, probe, 15, round hole, 16, bottom plate of test section, 17, top plate of test section.

Detailed ways

The present invention will be further described below in conjunction with drawings and embodiments.

As shown in Fig. 1, Fig. 2, Fig. 3 and Fig. 4, the present invention vertically welds a circular steel plate 3 at one end of the round steel pipe 1, and the other end is coaxially welded with a nut 4, and the screw 5 is inserted into the round steel pipe 1 through the nut 4, and the screw 5 and the nut 4 form a screw pair, and the head of the screw 5 is vertically welded to another round steel plate 6; two or more wind tunnel flow field test components with the same structure are installed on the round steel pipe 1 inside the two round steel plates to form a racking device; Each wind tunnel flow field test component with the same structure includes: two semi-circular steel hoops 7 and Pitot tube 10; two semi-circular steel hoops 7 are tightened on the round steel pipe 1 by screws 8 at both ends to form a circular ring Steel hoop 9, Pitot tube 10 Vertical round steel pipe 1 is installed on a semi-circular steel hoop 7 through connectors, total pressure hole 11 and static pressure hole 12 at one end of Pitot tube 10 are respectively connected to pressure measuring equipment through leather tube 13, Pitot The other end of the hosting 10 is a probe 14 .

The number of the wind tunnel flow field test components is set according to the experimental conditions, and the distance between the wind tunnel flow field test components is set on the round steel pipe 1 equidistantly or unequally according to the experimental conditions.

As shown in FIG. 2 , the probes 14 of all pitot tubes 10 have the same orientation, and the distances from the center of all the probes 14 to the center of the round steel pipe 1 are the same.

As shown in Figures 1 and 4, four circular holes 15 are provided on the circular steel plate 3 that is not welded with screws 5, and stiffeners 2 are welded between the circular steel plate 3 and the circular steel pipe 1.

Example:

Now take the test of ten measuring points in the vertical flow field of the wind tunnel as an example to illustrate the application method of the present invention.

As shown in Figure 5, firstly, the circular steel plate 3 of the device is placed downwards at the designated position of the wind tunnel test section, and the circular steel plate 3 is fixed on the bottom plate 16 of the test section with screws, and the head of the screw 5 is rotated with a wrench, and the other A circular steel plate 6 presses against the top plate 17 of the test section, installs ten wind tunnel flow field test components with the same structure on the circular steel tube 1, and ensures that the distance between the wind tunnel flow field test components meets the requirements of the flow field test, And ensure that the probes 14 of all pitot tubes 10 are all facing the incoming flow direction of the wind, and the distance from the center of the probes 14 to the center of the round steel pipe 1 is the same, and the total pressure hole 11 and the static pressure hole 12 of each pitot tube 10 are respectively passed through the leather tube 13 Connect with the pressure measuring equipment, turn on the wind tunnel to blow air, and calculate the average wind speed at the position of each probe 14 through the measured total pressure and static pressure of each pitot tube 13.

The above specific embodiments are used to illustrate the present invention, rather than to limit the present invention. Within the spirit of the present invention and the protection scope of the claims, any modification and change made to the present invention will fall into the protection scope of the present invention.

Claims (4)

1. A frame bending device for wind tunnel flow field testing, characterized in that a round steel plate (3) is vertically welded to one end of a round steel pipe (1), the other end is coaxially welded with a nut (4), and the screw (5) passes through The nut (4) is inserted into the round steel pipe (1), the screw (5) and the nut (4) form a helical pair, and the head of the screw (5) is vertically welded to another round steel plate (6); Round steel pipes (1) install more than two wind tunnel flow field test parts with the same structure to form a racking device; each wind tunnel flow field test part with the same structure includes: two semi-circular steel hoops (7), pitot tube ( 10); two semi-circular steel hoops (7) are tightened on the round steel pipe (1) by screws (8) at both ends to form a circular steel hoop (9), and the pitot tube (10) is vertical to the round steel pipe (1) Installed on a semi-circular steel hoop (7) through a connecting piece, the total pressure hole (11) and the static pressure hole (12) at one end of the pitot tube (10) are respectively connected to the pressure measuring equipment through the leather tube (13), and the pitot tube (10) The other end is a probe (14). 2. The racking device of a kind of wind tunnel flow field test according to claim 1, characterized in that: the number of the wind tunnel flow field test parts is set according to the experimental conditions, and the distance between the wind tunnel flow field test parts is according to The experimental conditions are arranged on the round steel pipe (1) with equidistant or unequal distances. 3. The racking device for wind tunnel flow field testing according to claim 1, characterized in that: the probes (14) of all pitot tubes (10) have the same orientation, and all probes (14) are centered to the circle The center distances of the steel pipes (1) are the same. 4. The racking device for wind tunnel flow field testing according to claim 1, characterized in that: the circular steel plate (3) that is not welded with screws (5) has four circular holes ( 15), a stiffener (2) is welded between the circular steel plate (3) and the circular steel pipe (1).

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