Airworthiness compliance verification method for combustion chamber casing

Abstract

The invention discloses an airworthiness compliance verification method for a combustion chamber casing. The method comprises the steps of (1) determining a load boundary condition of the combustion chamber casing according to clauses and requirements of CCAR 33.64, and determining a displacement boundary condition according to a constraint situation under an actual working condition; (2) conducting an eigenvalue buckling analysis on the combustion chamber casing, and obtaining eigenvalues and eigenvalue buckling modes under different orders; (3) selecting a first-order buckling instability portion of the casing as analysis focus, and performing a geometrical and material double nonlinear buckling analysis under a condition (1); (4) calculating a stability safety factor as the condition for determining the stability of the casing; (5) using a nonlinear buckling critical load obtained in (3) through analysis as an internal and external gas pressure difference, loading the boundary condition in (1) for a static strength analysis, and determining the compliance of the combustion chamber casing with the airworthiness clauses. The method simultaneously considers the stability and staticstrength of the combustion chamber casing, proposes a targeted verification analysis method, and indicates the airworthiness compliance of the combustion chamber casing.

Description

technical field [0001] The invention relates to an airworthiness compliance verification method for an aero-engine combustor casing, which is an airworthiness compliance verification method that takes into consideration the stability and static strength of the casing, and belongs to the technical field of aerospace engines. Background technique [0002] Civil aviation engine is an extreme product, and its core components work in a complex environment of high temperature and high pressure; as one of the key components of the engine, the stability of the combustion chamber casing is an important issue worthy of attention. On the one hand, the design seeks higher and higher temperatures before the turbine and objectively existing complex gas-heat-solid coupling effects, as well as the significantly increased air pressure in the inner channel of the core engine caused by the high boost ratio, making the combustion chamber engine The working environment of the box is particularly...

AI Technical Summary

Problems solved by technology

For the casing of the combustion chamber subjected to complex loads, the loss of stability is one of the important failure modes. The current casing design method usually uses the stress level as the failure judgment criterion, without considering the stability factor, and cannot comprehensively evaluate the casing. Cassette carrying capacity

Images