High-temperature flame flow device for dynamically and cyclically testing thermal shock resistance of thermal barrier coating

Abstract

The invention relates to a high-temperature flame flow device for dynamically and cyclically testing thermal shock resistance of a thermal barrier coating. The high-temperature flame flow device comprises a rotatable sample mounting unit, a heating unit, a cooling unit and a control unit, wherein the sample mounting unit is used for mounting multiple samples; the heating unit is used for heating coated surfaces of the samples and is provided with at least one flame nozzle with multiple flame cores which are annularly arranged in a shape of a concentric circle; the cooling unit is used for cooling the samples; the control unit is configured to control rotation of the sample mounting unit, so that the multiple samples are alternately heated and cooled. According to the high-temperature flame flow device, a constant temperature field flame flow with a small radial temperature gradient can be formed, and the thermal shock resistance of the multiple samples can be dynamically and cyclically tested concurrently.

Description

technical field [0001] The invention relates to performance testing of thermal barrier coatings, in particular to a high-temperature flame flow device for dynamic cycle testing of thermal shock resistance of thermal barrier coatings. Background technique [0002] One of the important ways to improve the thermal efficiency of an aeroengine, especially an aerogas turbine engine, is to increase the gas temperature at the turbine inlet of the turbine engine. With the development of aero-engines towards a higher thrust-to-weight ratio, the gas temperature at the turbine inlet also continues to rise. Even under the premise of using high-efficiency film cooling technology, the operating temperature of the guide vanes of the high-pressure turbine exceeds the current maximum high-temperature performance. Excellent reliable service temperature for single crystal superalloy blades. Therefore, it has become one of the effective measures to solve this problem to use a thermal insulation...

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Problems solved by technology

Currently available information shows that several domestic scientific research institutes have built test devices using oxygen / coal gas or oxygen / acetylene flames as heat sources. The enthalpy values ​​of gas and acetylene gas flames are both low, and the heating capacity is not strong. ; Moreover, the flame nozzles used by these companies are all single-hole flame nozzles with a diameter of less than 30 mm. The beam spot of the flame jet is small, and the radial temperature gradient of the flame is large, so the effective test area of ​​the flame diameter less than 30 mm

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