Thermostability of casings of gas-discharge tubular water-cooled radiation sources in nonstationary state

In this research we examine quartz glass and leucosapphire (artificial sapphire) casings, which are used for making powerful water-cooled gas-discharge radiation sources, and we analyze thermostability of these casings. The sources of such type and blocks from them can be successfully used to solve a wide range of problems of thermal and thermo-strengthening field tests of structural elements, such as hypersonic aircraft. A serious problem of using the radiation sources, especially when power is repeatedly boosted, is that at first time after switching on the radiation source in its envelope changes in temperature may occur, exceeding the permissible value (a phenomenon of "thermal shock") and causing its destruction. As part of the assumptions, we formulated a mathematical model of the problem and analyzed the results. The findings of the research show, that even when the power of radiation source exceeds the capacity of existing sources with quartz glass casings in 2.5 times, temperatures in leucosapphire casing and temperature difference along the casing thickness do not limit its performance in heat resistance.

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