Thermal insulating layer for hot channel of hypersonic-velocity wind tunnel

Abstract

The invention relates to a thermal insulating layer, and in particular relates to a thermal insulating layer for a hot channel of a hypersonic-velocity wind tunnel. The thermal insulating layer is in a cylindrical structure and comprises a cylinder body and two cylinder covers, wherein the cylinder body is formed by rolling a plurality of metal plates; each cylinder cover is manufactured by a metal plate; the two cylinder covers are respectively welded at the two ends of the cylinder body; and each metal plate is of a convex structure. The thermal insulating layer adopts a structure with the multiple metal plates, utilizes air among the thin plates for thermal insulation and fulfills the purposes of resisting the brush of air flow and the pressure of the internal air flow by utilizing the strength of the metal plates, so that a pressure balance hole does not need to be formed, the service life of the thermal insulation layer structure is prolonged, and the pollution of thermal insulating materials to a flow field is eliminated; the convex area is 33%-40%, and the thermal insulation effect and the stiffness of the thermal insulation layer structure are ensured at the same time; and the overhaul and the maintenance to the equipment are unnecessary, therefore, the cost is saved, and good economic benefits are achieved.

Description

Technical field [0001] The invention relates to a heat insulation layer, in particular to a heat insulation layer used for a heat pipe of a hypersonic wind tunnel. Background technique [0002] Conventional hypersonic wind tunnels generally use compressed air as the test medium, and when compressed air expands, it will absorb a large amount of surrounding heat and condense the moisture in the compressed air. Although the compressed air used in the wind tunnel is dried, as the test Mach number increases, the condensation problem still exists. Therefore, in the hypersonic wind tunnel, heating equipment is generally used to heat the test medium to avoid condensation. In order to reduce the influence of the temperature rise of the test medium on the structure of the wind tunnel, and at the same time reduce the temperature of the equipment surface (so as not to cause risks to the test personnel), a heat insulation layer is generally installed inside the heat pipe of a hypersonic wind ...

AI Technical Summary

Problems solved by technology

[0003] The disadvantage of the existing technical solution is that the high-silica surface felt is easy to inhale the airflow from the balance hole, resulting in the loss of heat insulation material and reducing the heat insulation effect. At the same time, the heat insulation material that inhales the airflow contaminates the flow field and damages the test equipment

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