Abstract
The high bypass ratio turbofan engine’s load-carrying structure transient response during bird ingestion was analyzed in accordance with the engine bird ingestion certification regulations, the principles of structural safety assessment were represented, and the structural safety analysis and assessment method of Turbo-Fan engine during bird ingestion were proposed. A high bypass ratio turbofan engine’s FEM was established and verified the rationality when its’ operation. Large bird ingestion into an engine’s procedure was conducted, the dynamic responses of key components on engine’s load-carrying structures during the bird ingestion were discussed, and the safety assessment consequence was obtained. We draw a conclusion that the relevant analysis/simulation data could be submitted to engine certification administration as key documents, the structural safety analysis and assessment method of turbofan engine due to bird ingestion could be applied as analysis and prediction work in the engine bird ingestion certification.
Highlights
High bypass ratio turbofan engine often encounters bird ingestion, which affects the structural safety of the engine [1,2,3]
The bird ingestion accidents of JT9D engine in 1997 [4] and PW4060 engine in 2007 [5] show that during bird ingestion of high bypass ratio turbofan engine, a sudden increase of high-energy load will occur in the structure, which would cause complex dynamic response in the key components of its transmission path, endangering the structural safety of the whole engine
The main conclusions are as follows: (1) Based on the analysis of bird ingestion failure of engine, the safety assessment criteria for bird ingestion structure of engine were established as follows: (1) no block or breakage of rotor/stator components should occur; if it occurs, the casing should be able to contain the above-mentioned high-energy debris; (2) all exposed components in the load-carrying structure should be able to withstand the direct impact of bird body or bird body debris cut by fan, and the peak stress level should be equal to the corresponding bird body or bird body debris cut by fan
Summary
High bypass ratio turbofan engine often encounters bird ingestion, which affects the structural safety of the engine [1,2,3]. Bird ingestion is teased out firstly, followed by grasping the key research contents that must be carried out for the verification of safety assessment criteria, establishing compliance verification technology solutions in detail and putting forward the corresponding compliance methods or their combination. On this basis, finite element modeling, model checking, computing/analysis, and comprehensive compliance analysis work such as regularity and influencing factors analysis can be performed to obtain the dynamic response of the engine structure after bird ingestion. The structure safety of the whole engine after bird ingestion can be determined with the combination of bird ingestion compliance verification of the whole engine
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