A 90° large angle of attack coupled 360° roll device in a sub-span super wind tunnel

Abstract

The invention discloses a 90-degree angle of attack coupled 360-degree rolling device for a sub-span super wind tunnel. The device comprises a bottom plate, a limiter, a column, an upper plate, a servo motor reducer assembly, a main output gear, a large diameter gear, a main screw assembly, an auxiliary screw assembly, a small diameter gear, a vertical bevel gear assembly, a horizontal bevel gearassembly, a counterweight assembly, an auxiliary screw adapter assembly, a main screw adapter assembly, a pull rod, an oil cup, a wire sensor, a sealing plate, a pipe line assembly, a supporting arm,a connecting rod, a pipe joint assembly, a support segment assembly, a dummy support rod, a linear guide rail and a sliding block support seat assembly. The device utilizes the inverse movement of aneccentric crank sliding block mechanism to continuously and accurately achieve a wide range of angles of attack of 15 to 90 degrees or even 120 degrees. The length of the 1.2m wind tunnel model can reach 800mm, and the blocking degree is less than or equal to 3%. The wind tunnel large angle of attack test capability under supersonic and subsonic conditions can be expanded.

Description

technical field [0001] The invention relates to a large attack angle mechanical mechanism applied to a subtransonic wind tunnel, and belongs to the field of experimental aerodynamics. Mainly through the differential drive of the gear set to drive the pull rod to realize the rotation of the support section assembly around the arm, to obtain different angles of attack of the models on the bracket, and to feed back the angle of attack through the potentiometer of the pull wire sensor. This mechanism can use the inverse motion of the eccentric crank slider mechanism to Accurately realize a large range of angle of attack ranging from -15° to 90° or even 120°, and the roll angle mechanism can realize 360° roll. A 0-X° sideslip angle joint is added to the front end of the support section assembly of the roll mechanism to realize the coupled simulation of the attack angle, roll angle, and sideslip angle. Control accuracy 3'. And can be collected in real time. Background technique ...

AI Technical Summary

Problems solved by technology

Although this structure can continuously achieve a 90° angle of attack, the joint structure is complex, and the joints and the arc-shaped scimitar tail support take up a lot of space, resulting in a large blocking ratio, and the length of the test model is relatively small compared to the size of the test section

[0007] The FL-24 and FL-26 wind tunnels can realize the coupled simulation of attack angle and sideslip angle, but cannot realize the simulation of continuous 90° attack angle and 360° roll angle

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