SU1816981A1 - Coordinate device of wind tunnel - Google Patents

Description

The invention relates to experimental aerodynamics, in particular to coordinate devices of wind tunnels, designed for installation and movement of models, nozzles and other devices in the working section of wind tunnels.

The aim of the invention is to expand the experimental capabilities by providing additional degrees of freedom of the holder with an increase in the range of limiting displacements of the model.

FIG. 1 shows the proposed device, the main id; Fig. 2 - the same, top view; in fig. 3 - the same, left side view; in fig. 4 - node I in Fig. 1; in fig. 5 - section a-a in Fig. 4; in fig. 6 is a functional diagram of the use of the device for testing the model in the range of variation of the angles of attack from a = -90 ° to a = + 90 °.

The coordinate device of the wind tunnel contains:

- base frame 1;

- support beams 11 and 25, fixed above the open working part of the wind tunnel, on which the frame-base is movably mounted by means of four roller carts 12;

- the first guides located on the base frame: base 22 (on the bearing beam 23 with a toothed rack 26) and support 14 (with a toothed rack 28);

- traverse 2, movably mounted on the first guides by means of roller supports 10, 21 and equipped with an electromechanical drive 24 and a toothed rack 29;

- the second guides 7 and 8 located on the traverse;

- carriage 3, movably mounted on the second guides on the traverse and having an electromechanical drive 15;

- flat casing 4 with four guide rollers .27, fixed on the side wall of the carriage and equipped with an electromechanical drive 16:

- a one-piece retractable stand 5 of a streamlined shape with a toothed rack 6, mounted movably on the carriage between the guide rollers 27 of the flat casing;

- holder 17 with a mechanism of angles of attack, mounted on the lower end of the retractable rack and mounted on a body 30 assembled in the form of a figured fork (see Fig. 4 and Fig. 5), bearing on its cheeks an axle 31 with a rotary block consisting of two toothed wheels 40.45 and a lever 18 located between them, fixed on the gear wheels by a pin 32 and having a socket with a clamp for fixing the holder 19 with the tested model 20 or with another product. The toothed wheels of the rotary unit are in engagement, respectively, with gears 42 and 44, fastened by means of pins 43 on a common axle 41 with a worm wheel 38, which is engaged with a worm 34. The worm shaft is connected at one end to the engine 33 of the mechanism for changing the angles of attack, and at the other end On the worm shaft, a gear 37 is installed, which is engaged with a gear 35 on the roller of the selsyn-sensor 36 for reading the angles of attack. On the rear part of the lever of the rotary block, a hole is cut through which the harness 39 is brought out to the recording devices of the measurement system.

The base frame, by means of its roller carts, is rolled along the support beams from the preparator room into the open working part of the wind tunnel. Fastening with the support beams in a fixed position, the base frame forms a rigid load-bearing bridge over the open working part of the pipe.

The guides for linear movement of the movable parts (traverses, carriages with a flat casing and a retractable rack) are oriented on the base frame in three mutually perpendicular directions, and the electromechanical drives of the movable parts are articulated with the corresponding toothed racks by means of gear wheels fixed on the output shafts of these drives. All electromechanical drives of the moving parts are equipped with direct current electric motors, the electric motor of the mechanism for changing the angles of attack is also direct current. To supply direct current, the electric motors of all drives are connected to a power supply unit 9 located on the base frame, in which direct current is obtained by conversion from alternating current supplied to the power supply unit via cable 13 from an alternating three-phase current with a voltage of 380 V.

The coordinate device of the wind tunnel works as follows.

When the electromechanical drive 24 is turned on, the traverse 2 moves along the first guides 22 and 14 on the base frame due to the engagement of the gears on the drive shafts with the toothed racks 26 and

28. This is how the traverse is linearly displaced on the base frame in the direction of the Z-Z axis.

When the electromechanical drive 15 is turned on, the carriage 3 moves along the second guides 7 and 8 on the traverse due to the engagement of the gear wheel on the output shaft of the drive with the gear rack 29 on the traverse. This is how the linear movement of the carriage is carried out with a flat casing 4 fixed on its side wall in the direction of the X-X axis.

When the electromechanical drive 16 is switched on, the one-piece retractable rack 5 along the guide rollers 27 in the flat casing 4 makes linear movements in the direction of the Y-Y axis due to the engagement of the toothed rack 6 on the rack with a gear wheel on the output shaft of the drive. Together with the retractable stand in the same direction 15, the holder 17 fixed on it with a mechanism for changing the angles of attack moves linearly, on the lever 18 of the rotary block of which model 20 is mounted by means of the holder 19. 20

By turning on the electric motor 33, the rotation of its shaft and the worm 34 connected to it is transmitted to the worm wheel 38 and the gears 42 and 44 attached to it, and through them to the gear wheels 40 and 45 with the lever 18 clamped between them, making turns at the angles of attack together with the fixed it has holder 19 with model 20 or other product.

Claims (1)

Form of invention 30 1. Coordinate device of the wind tunnel, containing fixed above the open working part of the wind tunnel support beams with a movably installed frame-base, located on the frame-base, the first guides with a movably mounted 5 carriage on them, and a retractable streamlined rack mounted on the carriage with a holder, characterized in that, in order to expand the experimental capabilities by providing additional degrees of freedom of the holder with an increase in the range of its limiting displacements, the first guides are equipped with a traverse movably mounted on them by means of covering roller bearings with second guides located on it, on which it is movably mounted carriage, and a retractable streamlined post with a holder is installed on the carriage, the carriage is equipped with a flat casing with guide rollers, and the retractable post is made in one piece and is movably mounted on these rollers, while the holder is made with a mechanism m change its angle of attack. 25 2. The device according to claim 1, which is characterized by the fact that the mechanism for changing the angle of attack is made in the form of a rotary block fixed with a lever and a clamp on the holder with interconnected toothed wheels, gears, worm gears. a wheel, a worm and a drive, and is equipped with a selsyn-sensor for reading the angle of attack. ϊΡ g i Fig. 3 I FIG. 4 Fig5 Figb