变展长战术导弹非定常气动特性研究

以某轴对称基准弹为模型,通过数值模拟对其进行了准定常和非定常气动特性研究,探索可变翼飞行器在变展长过程中的非定常气动特性。结果表明:在弹翼连续变展长的过程中,非定常气动特性曲线在对应的准定常气动特性曲线周围形成滞回环,若来流马赫数增大,则滞回环变小。当来流为超声速时,轴对称基准弹飞行迎角和变形周期对其非定常气动特性影响较小,而非定常气动特性并不显著,接近于准定常气动特性,在可变翼飞行器设计过程中可以忽略不计;当来流为亚声速时,展长变化对非定常气动特性有一定的影响,不能忽略。

Study on unsteady aerodynamic characteristics of variable-span tactical missile

Quasi-steady and unsteady aerodynamic characteristics of a certain axis symmetrical missile are studied by numerical simulation to explore the unsteady aerodynamic characteristics of the variable-span missile during the span-varying process.Results show that the hysteresis loops of unsteady aerodynamic characteristics of wing during a continuous span-varying process are around the corresponding quasi-steady curves;when the flow Mach number increases,the hysteresis loop becomes small;while the flow is supersonic,the influence of different attack angle and deformation period on unsteady aerodynamic characteristics of the variable-span missile is less and the unsteady aerodynamic characteristics is close to the quasi-steady aerodynamic characteristics.So the influence of both factors (attack angle and deformation)on unsteady aerodynamic characteristics could be ignored in the design process of the missile.But while the flow is subsonic,the influence of variable span on unsteady aerodynamic characteristics could not be ignored.