Airworthiness Compliance Research of Aerodynamic Performance on
 Bird Strike Damaged Fan Blades

Abstract

Abstract: In order to explore the impact of bird strike damage on the aerodynamic performance of the fan blade and the compliance of the relevant provisions in airworthiness certification, a typical high bypass ratio fan rotor was selected, then a bird strike damage model was simplified and the effect of middlebird typical damage to the aerodynamic performance of the fan blade by fullannulus numerical simulation was researched. The results show: the mass flow at chock point, the peak efficiency, the stability margin, the thrust of peak efficiency point and the maximum thrust of different number of damaged blades decline inordinately compared to the undamaged blade while the magnitude increases due to the increasing number of damaged blades. Wherein, when the number of damaged blade reaches three, the thrust at peak efficiency point decreases by about 11.35% and the maximum thrust decreases by about 20.68% compared to the undamaged blade, which meets the requirement in Airworthiness Certification that thrust losses of middle bird strike damaged fan can’t exceed 25%. Different amount of the damaged fan blade has flow separation from the damage position to the blade tip within different degrees, and leads that the outlet flow field of the fan has different degrees of distortion.

Key words: high bypass ratio fan, bird strike damage, aerodynamic performance, thrust loss, airworthiness certification

CLC Number:

V 231.3

LU Jiahua，QIANG Xiaoqing，TENG Jinfang，YU Wensheng. Airworthiness Compliance Research of Aerodynamic Performance on
Bird Strike Damaged Fan Blades[J]. Journal of Shanghai Jiaotong University, 2017, 51(8): 932-938.

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