Safety Analysis of Flow Parameters in a Rotor-stator Cavity |
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Authors: | ZHANG Gonga b DING Shuitinga b aAirworthiness Technologies Research Center Beihang University Beijing China b National |
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Institution: | Key Laboratory of Science and Technology on Aero-Engine Aero-thermodynamics, School of Jet Propulsion, Beihang University, Beijing 100191, China |
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Abstract: | In order to ensure the safety of engine life limited parts (ELLP) according to airworthiness regulations, a numerical approach integrating one-way fluid structure interaction (FSI) and probabilistic risk assessment (PRA) is developed, by which the variation of flow parameters in a rotor-stator cavity on the safety of gas turbine disks is investigated. The results indicate that the flow parameters affect the probability of fracture of a gas turbine disk since they can change the distribution of stress and temperature of the disk. The failure probability of the disk rises with increasing rotation Reynolds number and Chebyshev number, but descends with increasing inlet Reynolds number. In addition, a sampling based sensitivity analysis with finite difference method is conducted to determine the sensitivities of the safety with respect to the flow parameters. The sensitivity estimates show that the rotation Reynolds number is the dominant variable in safety analysis of a rotor-stator cavity among the flow parameters. |
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Keywords: | airworthiness aircraft engines engine life limited parts safety analysis rotor-stator cavity risk assessment |
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