Aerodynamic Analysis And Research Of Aeroengine Fan Blade Based On Wind Erosion

On the basis of ensuring safety,continuously improving economy is the embodiment of the competitiveness of civil aviation engine products.The working environment of aero-engines is harsh.During long-term service,the safety of aero-engine is challenged.In addition,the high cost of engine maintenance and the long time for a single maintenance have a negative impact on its economy.During the operation of the aero engine,the leading edge of the fan rotor blade is eroded by the incoming flow,causing the blade shape to change,which in turn affects the fan components and the overall aerodynamic performance of the engine.Aiming at the leading edge erosion phenomenon and the leading edge maintenance status,this paper focuses on the following two aspects:(1)Establish model of an eroded fan rotor blade,numerically calculate eroded blades with leading edge erosion lengths of 0μm,120μm,and 250μm,simulate the aerodynamic characteristics after blade eroded,and explore the aerodynamic degradation law of erosion blades.The results show that the degradation of the blade leading edge shape to a blunt leading edge is the main factor that reduces the aerodynamic performance,and the rough leading edge will further deteriorate the blade’s work on gas.Under the design conditions,R_z=250μm blunt leading edge blade’s efficiency value decreased by 1.29 percentage points compared with the original blade,and the total pressure ratio decreased from 1.214 to 1.208;under near stall conditions.Airflow separation and reattachment occur on the suction surface of the R_z=250μm blunt leading edge blade,and the direction of flow near the wall changes into radial direction.(2)According to the aircraft maintenance manual(AMM),summarize the fine maintenance constraints of the leading edge of the fan rotor blades,and perform parametric modeling on a total of 10 airfoil sections of the eroded blades.Optimize the shape of the leading edge of the eroded blade while keeping the overall airfoil shape from changing greatly.The results show that the fine maintenance of the leading edge of the blade can significantly improve the aerodynamic level of the eroded blade,the performance of optimized blades can basically recover to the performance level of original blade;there are slight differences between different fine maintenance methods on blade performance.Under the design point conditions,compared with the eroded blades,the optimized upper blades have an efficiency value increased from93.15%to 94.36%,which is only 0.08 percentage points lower than the original blade.The flow condition in the boundary layer is improved and the boundary layer loss is reduced.Compared with the optimized upper blades,the lower energetic blades differ by 0.23 percentage points.