A method for calculating the allowable temperature and minimum cooling water quantity of a rectangular combustion section

By combining the small deflection theory of elastic thin plates with the one-dimensional stress analysis of the linear thermoelastic constitutive law, the problem of combining mechanical stress and thermal stress in the calculation of cooling water volume in rectangular combustion sections is solved, realizing fast and accurate calculation of cooling water volume and temperature, and improving design efficiency and safety.

CN122452097APending Publication Date: 2026-07-24AVIC GUIYANG ENGINE DESIGN & RES INST
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Patent Information

Application Number
CN202610333627.1
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Priority Date
2026-01-06
Filing Date
2026-03-18
Publication Date
2026-07-24

AI Technical Summary

Technical Problem

Existing technologies cannot effectively combine mechanical and thermal stresses when calculating the cooling water volume of rectangular combustion sections, leading to unreasonable designs. Furthermore, the calculation methods are complex and resource-intensive, making it difficult to provide design guidance.

Method used

The theory of small deflection of elastic thin plates and the linear thermoelastic constitutive law are adopted, combined with one-dimensional stress analysis. The wall thickness and allowable stress constraints of the rectangular combustion section are calculated by cyclic calculation, and the minimum cooling water volume and inner wall temperature are calculated by combining the heat balance equation.

Benefits of technology

It enables rapid and accurate calculation of the minimum cooling water volume and the maximum allowable temperature of the inner wall surface under different wall thicknesses, simplifying the design process and improving design efficiency and safety.

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Abstract

The application discloses a calculation method of a rectangular combustion section allowable temperature and minimum cooling water quantity, comprising the following steps: determining a wall thickness optional range and an allowable stress constraint of the rectangular combustion section, and obtaining calculation parameters; wherein the allowable stress constraint comprises: a tensile limit selected when a small deformation of a material is allowed as the allowable stress constraint, and a yield limit selected when a deformation of the material is not allowed as the allowable stress constraint; the calculation parameters comprise: an outer wall surface temperature of the combustion section, a maximum gas temperature, a mechanical stress and a thermal stress; the allowable stress constraint and the wall thickness of the rectangular combustion section are traversed, and the rectangular combustion section allowable temperature and the minimum cooling water quantity are cyclically calculated; and the rectangular combustion section allowable temperature comprises: an inner wall surface temperature and a near-wall allowable gas temperature. According to the above technical scheme, the minimum cooling water quantity under different wall thickness selection conditions can be efficiently calculated in the design stage, and meanwhile, key physical quantities such as the inner wall surface maximum allowable temperature under different wall thickness selection conditions can also be calculated.
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