An Experimental Study on Aircraft Internal Store Separation Characteristics

An, Eunhye; Cho, Donghyun; Kim, Jongbum; Jang, Youngil; Jeong, KyeongJin; Kim, Sangjin; Lee, Hokeun; Reu, Taekyu; Chung, Hyoungseog

doi:2017.20.1.81

J. KIMS Technol > Volume 20(1); 2017 > Article

Journal of the Korea Institute of Military Science and Technology 2017;20(1):81-89.
DOI: https://doi.org/10.9766/KIMST.2017.20.1.081

An Experimental Study on Aircraft Internal Store Separation Characteristics

Eunhye An, Donghyun Cho, Jongbum Kim, Youngil Jang, KyeongJin Jeong, Sangjin Kim, Hokeun Lee, Taekyu Reu, Hyoungseog Chung

¹Department of Mechanical Engineering, Korea Air Force Academy
²Department of Aerospace Engineering, Korea Air Force Academy
³The 7th Research and Development Institute, Agency for Defense Development

항공기 내부무장 분리특성 분석을 위한 풍동시험연구

안은혜, 조동현, 김종범, 장영일, 정경진, 김상진, 이호근, 류태규, 정형석

¹공군사관학교 기계공학과
²공군사관학교 항공우주공학과
³국방과학연구소 제7기술연구본부

Abstract

This study investigates store separation characteristics of an unmanned aerial vehicle having generic stealth configuration over unsteady flow of an internal bay. Free-drop wind tunnel tests are conducted to simulate bomb releases from an internal weapons bay while high-speed camera images are taken. The images are analyzed to examine the effects of flow velocity, angle of attack, flap deflection and the ejector force application on the store separation trajectories. For the free-drop wind tunnel tests, Froude Scaling is applied to match the dynamic similarity for the bomb model, and the ejector force is simulated by using small pneumatic cylinders. The results indicate that the test bomb model safely separates from the internal bay at the given test conditions and configurations. It is also observed that the effects of the flow velocity and ejector force application have greater impacts on the separation trajectories than those of angle of attack and flap deflection.

Key Words: Unmanned Aerial Vehicle, Internal Store Separation, Free-drop Test, Froude Scaling, Bifilar Swing Method, Photogrammetry