Trajectory Simulation of Chaff Dipoles of Slender Circular Cylinder
The flight behavior of chaff is numerically investigated. Numerical simulations have been performed to understand the flight behavior of both single chaff dipole and multiple chaff dipoles, including the effect of geometric curvature. For this purpose, a numerical methodology for simulating the trajectory of chaff dipoles is developed. The methodology is a fully coupled process, which consists of an aerodynamics part and a trajectory simulation part. Chaff as a countermeasure is generally assumed to be slender circular cylinder with very small diameter, which corresponds to a Reynolds number of unity. To obtain the normal force at this low Reynolds number, a curve-fit formula offered by Sucker and Brauer is used, while an analytic solution offered by Curie is used to obtain the tangential force. As a result of trajectory simulation, it was found that the elevation angle of a single dipole maintains its initial orientation while that of a bent dipole tends to be horizontal with respect to the ground. This phenomenon makes the difference of position distribution between a chaff cloud of straight dipoles and that of bent dipoles.
chaffs very low Reynolds number trajectory simulation bent dipole
Hyun Jae Nam Oh Joon Kwon
Department of Aerospace Engineering, Korea Advanced Institute of Science and Technology, Daejeon 305-701,Korea
国际会议
2010 Asia-Pacific International Symposium on Aerospace Technology(2010 亚太航空航天技术研讨会 APISAT 2010)
西安
英文
387-390
2010-09-01（万方平台首次上网日期，不代表论文的发表时间）