现代大型飞机起落架气动噪声研究进展

Landing gear is one of the most important aeroacoustic noise sources during modern large aircrafts takeoff and landing. This paper some research achievements and latest developments made through wind tunnel experiments, flyover experiments and numerical simulations in the aeroacoustic investigation field of landing gear in the last decades. This paper a brief overview of four aspects including the noise generation mechanisms, the noise reduction techniques, the similarity rule of wind tunnel aeroacoustic experiments and the prediction methods for landing gears. Landing gear broadband noise can be generally categorized into two parts is the flow separation induced noise and the other is the interaction noise between upstream and downstream components. Moreover, the resonant phenomenon appeared in some cavity configurations can also generate tonal noise. Some active and passive noise reduction methods such as fairing and plasma actuators which can suppress the flow separation and interaction phenomena are used to reduce landing gear noise. Finally, prediction of further research on landing gear noise is presented.