Changing Effect in Aerodynamic Characteristics of a Captive Body Separated from Aircraft

Cho, Hwan-Kee; Lee, Sang-Hyun; Kang, Chi-Hang

doi:2011.14.3.397

J. KIMS Technol > Volume 14(3); 2011 > Article

Journal of the Korea Institute of Military Science and Technology 2011;14(3):397-404.
DOI: https://doi.org/10.9766/KIMST.2011.14.3.397

Changing Effect in Aerodynamic Characteristics of a Captive Body Separated from Aircraft

Hwan-Kee Cho, Sang-Hyun Lee, Chi-Hang Kang

¹
²

항공기 탑재체의 분리 후 공력 특성 변화 효과

조환기, 이상현, 강치행

¹경상대학교 항공우주시스템공학과 항공기부품기술연구센터
²공군사관학교 항공우주기계공학과

Abstract

The aerodynamic characteristics of a separated captive body in flow field around aircraft are studied to observe aerodynamic stability for safe separation from aircraft. Since the captive body separated from aircraft is initially exposed to unsteady flow pattern, the change of aerodynamic forces and moments should be measured to analyze how the flow pattern affects on the captive body at the vicinity of aircraft. Aerodynamic forces and moments of the separated captive body are measured at selected positions along predictable dropping trajectories. The measuring trajectories, generated by the free drop test of the dropping model in the wind tunnel, are consisted of 9 possible lines by free dropped trajectories. Experimental results show that the aerodynamic forces and moments are significantly varied with the distance between the captive body and aircraft. In conclusion, the change of aerodynamic characteristics within flow field around aircraft should be considered to simulate trajectories of the separated captive body from aircraft.

Key Words: Separated Captive Body, Wind Tunnel, Aerodynamic Forces and Moments, Free Drop Test, Safe Separation