A 90° Large Angle of Attack Device for a Subtransonic Wind Tunnel

Abstract

The invention discloses a sub-span supersonic speed wind tunnel 90-degree large attack angle device. The device comprises a lower bottom plate, limiting stoppers, vertical columns, an upper bottom plate, a servo motor speed reducer assembly, a main output gear, a large-diameter gear, a main lead screw assembly, an auxiliary lead screw assembly, a small-diameter gear, a vertical bevel gear assembly, a horizontal bevel gear assembly, a counterweight assembly, an auxiliary lead screw adapter assembly, a main lead screw adapter assembly, a pull rod, an oil cup, a wire drawing sensor assembly, sealing plates, a pipeline assembly, a supporting arm, a connecting rod, a pipe joint assembly, a supporting section, a balance model supporting rod assembly, linear guide rails, a sliding block support assembly and a false supporting rod. The device has advantages of being reasonable and simple in structure, convenient to install, high in precision, small in blocking degree, large in testing model, high in testing efficiency, low in cost, realizable in large range of attack angle, and the requirement for running of the attack angle with 90-degree and even 120-degree wide-range of the wind tunnelcan be met.

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 around the arm, to obtain different angles of attack of the models on the bracket, and to feed back the angle of attack angle 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 wide range of angle of attack ranging from -15° to 90° or even 120°, with a control accuracy of 3'. And can be collected in real time. Background technique [0002] With the rapid development of military science and technology, the requirements for mobility in the design of new missiles and aircraft are getting higher and higher, and the flight boundaries of modern aircraft and missiles have bee...

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

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