外物损伤对民用飞机短舱内/外流气动特性的影响

doi:10.7527/S1000-6893.2014.0108

Abstract

Abstract:

The aerodynamic characteristic of a civil aircraft nacelle with foreign object damage (FOD) is numerically simulated which is motivated by the engine/airframe airworthiness validation. The effects of FOD on nacelle internal/external flow characteristics and their underlying flow physics are investigated. The results suggest that the influence of FOD on the nacelle aerodynamic characteristics and the safety performance can be preferably learned in the investigation which are based on the three-dimensional finite element simulation of collision impact conducted beforehand; the damage and deformation of the cowl result in a reduced outflow quality and affect the through flow capacity of the inlet and further reduce the engine efficiency, while results in a loss of suction at the lip which leads to even greater drag coefficient of nacelle with FOD than the smooth one. Although the drag coefficients in general are becoming similar between the two when the outflows are stalling at the cowl of nacelle. The study also indicates that the numerical simulation performed in this paper will provide a technical basis and some recommendations to the safety assessment of the civil aircraft and structural design of the engine nacelle.

Key words: civil aircraft, foreign object damage, nacelle, inlet, total pressure recovery coefficient, numerical simulation

CLC Number:

JI Changrui, LIU Kaili, ZHANG Pengfei, SI Jiangtao. Effects of foreign object damage on civil aircraft nacelle internal/external aerodynamic characteristics[J]. ACTA AERONAUTICAET ASTRONAUTICA SINICA, 2015, 36(3): 772-781.

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Effects of foreign object damage on civil aircraft nacelle internal/external aerodynamic characteristics

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