Device used for testing height of hypersonic wind tunnel continuous variable projection

Abstract

The invention relates to a device used for testing height of hypersonic wind tunnel continuous variable projection. A support system is used for fixing a panel at certain height in a wind tunnel, plane direction of the panel is consistent with incoming flow in the wind tunnel; the panel is provided with a hole, the shape of the hole is consistent with the shape of a projection model, thus the projection model can move up and down freely in the hole and a gap between the projection model and the hole is small enough; the lower end of the projection is connected with a cylindrical base, a pair of flat keys are symmetrically arranged on the surface of the cylindrical base, keyways of the flat keys are arranged on the inner surface of a cover cup fixedly connected with the lower surface of the panel, the inner surface of the cover cup is stacked with the inner surface of the hole arranged on the panel, the flat keys and the keyways are in sliding fit, and peripheral motion of the projection model and the cylindrical base is limited; the upper end of a driven shaft is provided with a screw thread, thus the driven shaft is matched with an inner threaded hole of the cylindrical base and can be contained into an inner cavity of the projection model; the lower part of the driven shaft is fixedly connected with a last stage gear of a gear system, a driving gear stage of the gear system is connected with a driving shaft, the upper end of the driving shaft is suspended onto the base of the support system, the lower end of the driving shaft stretches out the lower part of a cave body of a wind tunnel test section, and the stretching end is provided with a handle.

Description

technical field [0001] The invention relates to a test device capable of continuously changing the height of protrusions in a hypersonic wind tunnel, which can complete tests on the heights of multiple protrusions in one blowing of the wind tunnel, and belongs to the technical field of test devices. Background technique [0002] There are various protrusions on the surface of high-speed aircraft, such as the installation of wings on the fuselage, or the installation of various pylons on the wings or the fuselage, which destroys the original smooth fuselage or wing surface, forming Has a raised surface shape. Protrusions on the surface cause local interference, forming complex shock waves / boundary layer interference flow fields, causing significant changes in force and thermal loads near the protrusions, resulting in peak values ​​of local forces and thermal loads, which may cause structural damage to the aircraft, directly related to to aircraft component design and perform...

AI Technical Summary

Problems solved by technology

[0007] ●Because the height of each model is limited, the flexibility of the test is limited;

[0008] ●In the test, the wind tunnel blows more times and costs more;

[0009] ●Due to multiple starts, it is difficult to completely repeat the test parameters and improve the comparable accuracy of the test data

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