摘要
为研究投放条件对航弹与载机分离安全性的影响,采用非定常计算流体力学数值模拟方法和动网格技术,同时耦合求解六自由度弹道方程,对航弹与载机的分离过程进行模拟。给出载机在不同飞行马赫数、攻角、侧滑角、飞行高度及航弹在不同初始下抛速度、角速度条件下,航弹从载机投放后的分离轨迹和姿态变化规律,研究了这些因素对分离安全性的影响。研究结果表明:初始分离过程中载机对航弹有很强的气动干扰,对航弹的气动特性、分离轨迹及弹体姿态影响很大;随着分离马赫数、投放攻角增大,载机对航弹的气动干扰增强,航弹的分离安全性变差;对于挂载于左侧机翼下的航弹,一定的负向侧滑角有利于弹体与载机安全分离;飞行高度越高,越有利于航弹与载机安全分离;一定的初始下抛速度和适当的下抛初始角速度有利于安全分离。
In order to investigate the effect of initial release conditions on the safety of aerial bomb separated from aircraft,the separation process of aerial bomb from aircraft is simulated by using unsteady CFD numerical simulation method,dynamic mesh technique and 6-DOF trajectory equations. The trajectory and attitude variation of bomb after release are given under different conditions of Mach number,angle of attack,angle of sideslip,flight altitude,initial separation velocity and initial angular velocity. The results show that the aircraft has a strong aerodynamic interference on the bomb when separating,and has a great influence on the bomb＇s aerodynamic characteristics,trajectory and attitude. As the Mach number and angle of attack increase,the interference of aircraft on the bomb enhances,and the safety gets worse. For the bomb mounted under the left wing,a certain negative angle of sideslip is favorable to safe separation. The higher the flight altitude is,the safer the separation is. The certain initial separation speed and proper angular velocity are benefit for separation safety.
出处
《兵工学报》
EI
CAS
CSCD
北大核心
2016年第2期357-366,共10页
Acta Armamentarii
关键词
兵器科学与技术
机弹分离
数值模拟
动网格
气动特性
ordnance science and technology
weapon separation
numerical simulation
dynamic mesh
aerodynamic characteristics
