A generalized model for estimation of aerodynamic forces and moments for irregularly shaped bodies

作     者：Elvedin Kljuno Alan Catovic 

作者机构：Mechanical Engineering Faculty University of Sarajevo 

出 版 物：《Defence Technology（防务技术）》 (Defence Technology)

年 卷 期：2019年第15卷第3期

页      面：369-389页

核心收录：

学科分类：08[工学] 0826[工学-兵器科学与技术] 

主　　题：Aerodynamic force Aerodynamic moment Fragments 

摘      要：A novel method for estimation of an aerodynamic force and moment acting on an irregularly shaped body (such as HE projectile fragments) during its flight through the atmosphere is presented. The model assumes that fragments can be approximated with a tri-axial ellipsoid that has continuous surface given as a mathematical function. The model was validated with CFD data for a tri-axial ellipsoid and verified using CFD data on aerodynamic forces and moments acting on an irregularly shaped fragment. The contribution of this method is that it represents a significant step toward a modeling that does not require a cumbersome CFD simulation results for estimation of fragment dynamic and kinematic parameters. Due to this advantage, the model can predict the fragment motion consuming a negligible time when compared to the corresponding time consumed by CFD simulations. Parametric representation (generalization) of the fragment geometrical data and the conditions provides the way to analyze various correlations and how parameters influence the dynamics of the fragment flight.