Engine Centrifugal Impeller Fatigue Fracture Research Of Split Blade

Aero-engine’s deficiency in structural integrity and reliability seriously restrict the development target of the engine being developed.During the development of China’s aero-engine,a large number of structural integrity and reliability issues,such as blade fracture failure,significantly affect the development period.According to statistics,in the gas turbine engine,the accident caused by high cycle fatigue accounted for about 25% of the total accidents.Therefore,minimizing aero-engine blades high cycle fatigue failure is of great importance to China’s aero-engine development.This paper analyzes the possible causes of a centrifugal impeller splitter blade fatigue fracture by a failure tree,and analyzes one by one for each basic event of the failure tree,confirms the cause of blade fracture and failure modes.Depending on the cause of blade fracture,this paper proposes an improved design method and accomplishes experimental verification.The removal of the fault clears away a major obstacle in the development of the engine,and can provide a useful reference for the development of other engines.