A Thermal Strength State Analysis of a Cylindrical Combustion Chamber Manufactured Using Additive Technologies

Additive technologies based on layer-by-layer and direct laser sintering of metal powders make it possible to produce objects of complex shapes with high accuracy and at acceptable material and time costs. However, the implementation of additive technologies is associated with a number of technical difficulties caused by a decrease in strength characteristics of the material obtained as a result of laser sintering. The negative trend associated with deterioration of the material strength characteristics and its influence on the structure performance is most pronounced in heat-stressed units, in particular, in combustion chambers of power plants. The paper proposes and tests a computational and experimental method for estimating the stress-strain state of a regenerative cooled cylindrical combustion chamber manufactured using additive technologies. The authors present experimental data on the decrease in the material strength when laser sintering of power is used. The change in the safety factor of the cylindrical combustion chamber is estimated depending on its geometric characteristics and operating modes. The possibility of application of the developed method when choosing the configuration of a combustion chamber with regenerative cooling channels is shown.

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