直升机旋翼气动特性对挂装火箭弹道的影响

用悬停自由尾流模型计算悬停旋翼的流场,用工程算法计算机载火箭的气动特性,将旋翼流场影响下的弹道计算与气动力计算相结合,对武装直升机挂装火箭的气动特性及弹道特性进行了计算分析。结果表明:武装直升机的气动特性对挂装武器的弹道特性有显著影响,影响主要在旋翼尾流区,在该区内旋翼尾流对火箭的法向力系数、侧向力系数和滚转力矩系数的影响尤甚。

Influence to Ballistics of Helicopter-carried Rocket by Aerodynamic Characteristics

When a rocket is launched from a helicopter, it will cross a complex aerodynamic flow field brought by the rotor, the body of helicopter and the rocket. So, it is very important to study the influence to the rocket's ballistic by the flow field. The hovering rotor flow field was simulated by the free down-wash flow model, the aerodynamic characteristics of the helicopter-carried rocket was simulated by the engineering method. In order to study the interference to the rocket's ballistic by the flow field, the calculating of ballistics and aerodynamic force were coupled. The results of the simulation show that the initial ballistic of the helicopter-carried rocket is evidently affected by the aerodynamic characteristics, in the rotor down-wash flow field, the side-force coefficient and roll moment coefficient, etc. are obviously affected by the flow field.