SU1208904A1 - Device for ehamining aerodynamic interference of models with screen - Google Patents

Description

one

The invention relates to the field of experimental aerodynamics, namely to devices for studying the aerodynamic interference of models with a screen.

The aim of the invention is to improve the accuracy of the study of aerodynamic interference.

FIG. 1 shows schematically the described device; FIG. 2 shows a discrete movement drive of the screen simulator; in fig. 3 is a section A-A in FIG. 2} in FIG. 4 is a cross section bb of FIG. 2

The device for studying aerodynamic interference of models with a screen contains holders 1, 2 for mounting models 3, 4, screen simulator 5, static pressure receivers 6 and drainage tubes 7 connected to them. The device is equipped with a discrete displacement actuator 8 located in a pylon and connected to screen simulator, made with longitudinal sockets 9, which are interchangeable. The inserts 10, one of which has static pressure receivers 6, the center distance between the longitudinal sockets is equal to the discrete displacement drive malry, and the Z direction of the screen movement is perpendicular to the longitudinal sockets.

The screen is mounted on the guide 11, and the holders 1, 2 on the mechanism 12 change the angle of attack of the models. Drainage tubes 7 are assembled into a harness 13 and removed outside the wall 1A of the wind tunnel.

The actuator (Fig. 2) contains a hollow piston 15 with a seal 16. The piston 15 is installed in the cylinder 17 placed in the body of the pylon. The stroke of the piston 15 is limited by the length of the longitudinal through groove 18, through which the limiting pin 19 passes, holding the piston 15 from turning around the longitudinal axis. Pin 19 also serves as a stop for return

2089041

spring 20 of the piston 15, On the axis 21, fixed in the piston 15, is installed the pusher 22. The pusher 22 is spring-loaded spring 23.

5 Helicopter rail 24 is connected to the simulator screen 5 and is equipped with a spring retainer 25.

During operation, the piston 15 moves to the left under the action of

10 compressed air supplied to the cavity of the cylinder 17. At the same time, the pusher 22 enters the hollow of the helical gear 24 and, c. Interacts with it, moves the rail by an amount determined by the piston stroke and the angle of the bevel of the rack teeth. The stroke of the rail 24 is equal to the pitch of the teeth of the rail; therefore, the plunger is in its initial position against the trough.

20 teeth.

When bleeding compressed air

". From the cavity of the cylinder 17, the piston 15 returns to its initial position by the spring 20, while the pusher 22

25 out of engagement with the rail 24, turning around the axis 21. In the extreme right position of the piston, the pusher takes the initial position under the action of the spring 23, and the cycle

30 can be repeated. During the stroke of the piston 15, the retainer 25 is sunk by the advancing tooth of the rail 24. One stroke of the screen simulator, equal to the center distance between the sockets, takes place during one blowdown, during which the readings from the static pressure receivers 6 are taken. To remove the full static distribution

The pressure on the simulator of the screen is alternately shifted to the insert 10c by the static pressure receivers in the socket 9, and the experiments are repeated. Application removable inserts

 and the drive of discrete displacement of the screen allows, with limited dimensions of the working part of the wind tunnel, to conduct studies of the total distribution of pressure on the surface of the screen.

35

15 IS

Editor V.Tsalikhina

FIG. ff

Compiled by A. Terterashvili

Tehred M. Parotsay Proofreader; S. Cherni

3128 Circulation 357Subscribe

VNIIPI USSR State Committee

for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., d. A / 5

Branch PPP Patent, Uzhgorod, Proekto1a St., 4

Claims (1)

DEVICE FOR RESEARCH aerodynamic interference MODELS WITH SCREEN comprising a holder for fastening the models simulator screen static pressure receivers and connected thereto drainage tubes, characterized in that, in order to increase the accuracy of the study aerodynamic interference, it is provided with interchangeable inserts to pryvodom discrete displacements, connected to a screen simulator made with longitudinal sockets in which static pressure receivers are placed, while the distance between the nymi jacks * "! equal to the step of the discrete displacement drive, we hide the direction of the screen movement perpendicular to the longitudinal slots. <Vs.1 I