| A Study on the Aerodynamic Characteristic of Gunfire Damaged Airfoil |
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Ki-Young Lee, Hyoung-Seog Chung, Si-Tae Kim |
1Korea Air Force Academy
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| 화포에 의해 손상된 날개의 공력특성에 관한 연구 |
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이기영, 정형석, 김시태 |
1공군사관학교 기계공학과
2공군사관학교 항공우주공학과 |
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| Abstract |
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An experimental study has been conducted to investigate the effects of circular damage hole on the characteristics of airfoil performance. The damage on a wing created from a hit by anti-air artillery was modeled as a circular hole. Force balance measurements and static pressure measurements on the wing surface were carried out for the cases of having damage holes of 10% chord size at quarter chord and/or half chord positions. All experiments were conducted at Reynolds number of $2.85 imes10^5$ based on the chord length. The surface pressure data show big pressure alterations near the circular damage holes. This abnormal surface pressure distribution produces shear stress that could lead to the acceleration of the structural degradation of the wing around the circular damage hole. However, in spite of the existence of circular damage holes, the measured force data indicated the only a slight decrease in lift accompanied by increase in drag compared to the results of undamaged one. The influence of damage hole on the aerodynamic performance was increased as the location of damage moved to the leading edge. The effect on the control force was insignificant when the damaged size was not large. |
| Key Words:
Damaged Airfoil, Aerodynamic Characteristics, Wind Tunnel Test, Cross Flow |
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