Flexible pipeline device for mixed heating gas jet supply of hypersonic wind tunnel

Abstract

The invention belongs to the technical field of hypersonic wind tunnel tests, and discloses a flexible pipeline device for mixed heating gas jet supply of a hypersonic wind tunnel. The flexible pipeline device comprises a flexible hose, a hard pipe and a fixing device, the middle section of the flexible hose is a hose, and two ends are flanges; the hard tube and fixing device comprises a hard tube which is arranged along the windward side of a mechanism curved knife of the attack angle mechanism of the hypersonic wind tunnel and extends from bottom to top, and a fixing device for fixing the hard tube on the windward side of the mechanism curved knife. A hose adapter is arranged at the inlet end of the hard pipe, and a lens gasket is arranged on the end face of the hose adapter and used for being sealed with a flange connector of the flexible hose; and the outlet end of the hard pipe is provided with a flange connected with an air inlet pipe of a test device. The flexible pipeline device solves the gas supply problem of heating jet flow under high temperature, high pressure and 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 for mixed heating gas jet supply in a hypersonic wind tunnel. Background technique [0002] Compared with the cold jet, the mixed heating gas jet can simulate the specific heat ratio of the jet, the outlet Mach number and other parameters, which improves the simulation authenticity. In the conventional cold spray test, the wall of the test section is equipped 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 inlet interface of the model strut. The flexible hose can adapt to the movement of the mechanism. But 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 plastic tube generally does not ...

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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