A three-sonic wind tunnel test section expansion angle adjustment mechanism

Abstract

The invention relates to a trisonics wind tunnel test section expansion angle adjusting mechanism. Two sets of expansion angle adjusting mechanisms are symmetrically arranged along the horizontal plane of the axis of a trisonics wind tunnel test section respectively in an up and down mode. Each set of expansion angle adjusting mechanism comprises an adjusting piece and a lifting mechanism. Each adjusting piece comprises a connection section, a variable angle section and a rigid section, wherein, one end of the connection section is fixedly connected with the trisonics wind tunnel test section, the other end of the connection section is integrally connected with the rigid section through the variable angle section, and the lifting mechanism is connected with the end, away from the variable angle section, of the rigid section and used for lifting the adjusting piece. According to the trisonics wind tunnel test section expansion angle adjusting mechanism, the lifting mechanisms are used for driving the suspension ends of the adjusting pieces to move, so that the variable angle sections of the adjusting pieces elastically deform and are expanded according to a certain angle, the adjusting pieces are in smooth transition from front to rear, turning points and seams do not exist in a wall board, and influences on a flow field of a wind tunnel test section are small.

Description

technical field [0001] The invention relates to a mechanism for adjusting the expansion angle of a test section of a three-sonic wind tunnel. Background technique [0002] The test section is a component for simulating the flight flow field in the wind tunnel and conducting model aerodynamic tests, and is the core of the entire wind tunnel. The test section of the conventional three-sonic wind tunnel is a closed test section, and the test section is smoothly connected with the front nozzle. In order to meet the test requirements, the flow field uniformity of the test section is very high. During the flow process of the air flow in the test section, the boundary layer along the wall gradually thickens, which gradually reduces the effective potential flow section of the air flow, thus causing a gradual decrease in the Mach number and an increase in the static pressure along the axial direction of the test section, affecting the uniformity of the flow field . Experience at ho...

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Problems solved by technology

[0003] At present, the expansion angle adjustment mechanism of the test section of the three-sonic wind tunnel in China usually adopts the rotating shaft type, that is, the rotating shaft is set at the connection between the adjusting plate and the test section, and a certain expansion angle is generated by rotating the shaft. The expansion angle adjustment mechanism of the rotating shaft type test section Because the size of the shaft is limited by the structure, the angle turns obviously when it is expanded. At the same time, after a long time of use, there will be gaps in the connection position between the adjustment piece and the hinge due to wear, and expansion or compression waves will be generated under supersonic conditions, which will have a great impact on the uniformity of the flow field.

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