导弹轨控喷流气动干扰全空域插值方法研究

导弹侧向喷流气动干扰受海拔高度影响显著,主要原因在于雷诺数和压力比会随海拔高度的变化而变化。受大气参数的影响,雷诺数和压力比的变化规律并不一致。为能在现有气动模型基础上既保证插值精度又减少节点数,通过数值模拟方法研究了雷诺数和压力比对轨控喷流气动干扰的影响。结果表明:海拔高度对喷流气动干扰的影响主要由压力比变化造成,雷诺数变化产生的影响相对较小,且喷流干扰与压力比间存在一定的线性关系。因此,提出了一种基于压力比的喷流气动干扰插值方法。相比于传统的基于高度的插值方法,该方法可显著提高插值精度,并减少节点数,适用于全空域轨控喷流气动建模。

Study on Interpolation Methods of Lateral Jet Interaction for Missiles with Divert Control in Full Airspace

The lateral jet interaction for missiles with divert control is influenced significantly by altitudes, due to the different change rules of Reynolds number and pressure ratio along with altitudes. In order to ensure the precision of interpolation and reduce the computational work based on existing aerodynamic mathematical models, a numerical method is used to analyze the effects of Reynolds number and pressure ratio on the lateral jet interaction. The results show that the change of lateral jet interaction is mainly caused by the pressure ratio, rather than the Reynolds number, and there exists a certain linear relation between jet interaction and pressure ratio. Therefore, a new method of interpolation based on pressure ratio for the lateral jet interaction is developed. In comparison with the traditional interpolation method based on altitude, this method can improve the precision of interpolation significantly, and can be used to construct an aerodynamic mathematical model for the lateral jet interaction of divert control in full airspace.