On the Problem of Increasing the Power Discharge Radiation Sources for Thermal Tests of Flying Vehicle Constructions

Analysis results of the thermal regime of the tubular shells (which formed from quartz glass and leucosapphire) of water-cooled gas-discharge radiation sources are given. It is shown that at electric power range within 100 kW or more for radiation source temperature of the inner surface of the hot leucosapphire shell is lower than 2-4 times as compared with the temperature of the same surface of a quartz shell under otherwise identical conditions. The differential temperature through the leucosapphire shell thickness, is less than 8 times or more as compared with the temperature drop over the thickness of the quartz glass shell. This circumstance may have a positive impact for operability of shell made of a brittle material such as leucosapphire with a large linear expansion coefficient.

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