A method for adjusting the step difference of glass observation window on the side wall of a high-speed wind tunnel

Abstract

The invention discloses a method for adjusting step difference of a glass observation window on the side wall of a high-speed wind tunnel. The method comprises the steps of firstly, coating a soft belt with proper thickness with an epoxy resin adhesive, pasting the soft belt to the inner chamfer conical surface of a round steel window, then taking glass as an inner mold to compress the soft belt,measuring the step difference between the glass and the round steel window after the epoxy resin adhesive is hardened, then further adjusting a greater step difference by adopting a rubber belt and adjusting a smaller step difference by adopting a white adhesive tape, and finally, ensuring the step difference to meet the requirement. The method is simple and efficient, the cost is saved, the cycleis shortened, the fitting property and the sealing reliability between the glass and the round steel window are improved by a composite sealing gasket formed by the soft belt, the rubber belt and thewhite adhesive tape, the support for the glass is enhanced, and particularly, the risk that the glass is crushed because the inner chamfer conical surface of the round steel window and the outer chamfer conical surface of the glass are in non-uniform contact due to out-of-tolerance of roundness and taper shapes is avoided.

Description

technical field [0001] The invention belongs to the technical field of high-speed wind tunnel tests, and in particular relates to a method for adjusting the step difference of a side wall glass observation window of a high-speed wind tunnel. Background technique [0002] During the high-speed wind tunnel test, in order to facilitate the observation of the model state and flow field display, a large-diameter observation window is installed on the side wall of the wind tunnel test section. The quality of the flow field is very sensitive to the step difference of the observation window. In order to ensure the quality of the test flow field, it is required that the installation position of the observation window must be sealed, there is no reverse airflow gradient, and the downstream airflow gradient is less than 0.05mm. Since the glass of the observation window is subject to certain positive and negative pressures during the high-speed wind tunnel test, the glass needs to be pr...

AI Technical Summary

Problems solved by technology

At present, rubber pads are usually used to seal between the glass of the observation window and the round steel window, and the thickness of the rubber pad reaches 3mm to 7mm. The thicker rubber pad causes the pressing force and step difference of the glass to be unable to guarantee at the same time.

Moreover, the roundness and taper of the installation surface of the glass and the round steel window are prone to out-of-tolerance, resulting in line contact or point contact between the glass and the round steel window, which will lead to stress concentration of the glass when the glass is pressed and crush the glass.

Images