不同截面机身的RCS及气动特性研究

AN APPROACH TO RCS STEALTH-AERODYNAMIC CHARACTERISTICS OF DIFFERENT CROSS SECTION FUSELAGES

对三个“板块”多边形截面机身及圆截面机身模型进行了RCS隐身特性和低速气动特性的测试与研究,发现多边形截面机身不但具有良好的隐身性能,特别是机身侧面,无论是水平极化或是垂直极化,其RCS值均比相同截面面积的圆截面机身降低一个数量级,而且其气动特性不比圆截面机身差,其升力特性与最大升阻比均比圆截面机身好。最后还给出了考虑多边形侧边缘夹角的横向绕流粘性效应的经验修正公式,可供多边形截面机身的气动特性估算参考。

The tests and studies of three 'panel' polygonal-cross-section fuselage models and one circular section fuselage model are carried out respectively in RCS-stealthy and low speed aerodynamic characteristics. The polygonal section fuselages are better than the circular section fuselage not only in stealth, especially the RCS of the side surfaces of the fuselages is lower than that of the circular one with the same area by an order both in horizontal polarization and in vertical polarization, but also in aerodynamic characterstics, for example in lift and maximum lift-drag ratio. An aerodynamic characteristics correction evaluation method is proposed based on the contour of the 'panel' polygonal cross section on the basis of the cross flow viscous effects of the side flange angles and the calculation method of low aspect ratio wing. The results of calculation are in good agreement with those of the experiment.