Flexible piping device for mixing and heating gas jets in hypersonic wind tunnels

Abstract

The invention belongs to the technical field of hypersonic wind tunnel tests, and discloses a flexible pipeline device used for gas supply by mixing and heating gas jets in a hypersonic wind tunnel. The flexible pipeline device includes a flexible hose and a rigid pipe connected in sequence, and a fixing device; the middle section of the flexible hose is a hose, and the two ends are flanges; The hard pipe arranged on the windward side of the mechanism scimitar and extending from bottom to top, and the fixing device for fixing the hard pipe on the windward side of the mechanism scimitar; the inlet end of the hard pipe is provided with a hose adapter, and the end face of the hose adapter is provided A lens pad is provided for sealing with the flange interface of the flexible hose; the outlet end of the hard pipe is provided with a flange connected with the air inlet pipe of the test device. The flexible pipeline device solves the gas supply problem of the heating jet under high temperature and high pressure and a variable attack angle, and has engineering application value.

Description

technical field [0001] The invention belongs to the technical field of hypersonic wind tunnel tests, and in particular relates to a flexible pipeline device used for gas supply by mixing and heating gas jets in a hypersonic wind tunnel. Background technique [0002] Compared with the cold jet, the mixed heating gas jet can simulate parameters such as the specific heat ratio of the jet and the Mach number at the outlet, which improves the simulation authenticity. In the conventional cold jet test, the wall of the test section is provided with an air supply interface. Generally, copper pipes and plastic high-pressure hoses are used to transfer from the air supply interface to the air intake interface of the model strut. The flexible hose can adapt to the movement of the mechanism. However, for the mixed heating gas jet, the temperature of the mixed heating gas usually reaches about 600 °C, the temperature resistance of the copper tube generally does not exceed 200 °C, and the ...

AI Technical Summary

Problems solved by technology

If the hard tube of superalloy is used to connect the air inlet and the gas supply end, the pipeline cannot meet the requirements of the mechanism movement, and only the test with a fixed angle of attack can be carried out, and the air supply method of the hose must be used

[0003] Ordinary bellows are flexible but the inner wall is not smooth enough, so there is a problem of large pressure loss. The test shows that the pressure loss can reach up to 90%

High-temperature and high-pressure flexible hoses usually have smooth lining, pressure-resistant and temperature-resistant metal bellows, heating cables, insulation layers, metal braided protective layers, etc., with many structural parts, large diameters, and heavy weights (required for hypersonic wind tunnel tests) hundreds of kilograms of high-temperature and high-pressure flexible hose), the direct connection of high-temperature and high-pressure flexible hose to the model will increase the blockage of the wind tunnel, and will also interfere with the flow field of the aircraft, thereby affecting the measurement results

In addition, although the heating cable is protected by a metal braid layer, the metal braid layer may be sanded and pierced under the impact of high-speed airflow containing impurities, while the insulation layer does not have the ability to protect against impact

That is to say, it is not suitable to directly connect the high-temperature and high-pressure flexible hose to the model due to the limitations of hypersonic wind tunnel blockage, connection strength and impact resistance of high-temperature and high-pressure flexible hose.

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