鸭翼布局中双立尾对全机气动及流场特性影响

在战斗机先进气动布局研究中,双立尾位置的选择始终是一个十分重要的问题.不适当的双立尾位置会给飞机纵横向气动特性带来严重的影响.对一种鸭翼布局的飞机模型,按3种不同的双立尾配置进行了气动力测量、流态显示,然后用PIV(Particle Image Velocimetry)进行了不同迎角下的流场测量.结果表明:双立尾处于飞机内侧后置内移位置其最大升力系数具有最大值.破裂过程及流场特性同无双立尾时的情况十分相似,进而说明双立尾同机翼涡的干扰主要是促进了涡的提早破裂,从而恶化了全机气动特性.

Influence of the Twin Vertical Tails on the Aerodynamic Characteristics

In the study of the advanced aerodynamic fighter configuration,the location of twin vertical tails is always an important problem. In this paper, a fighter model of canard configuration was studied. The study includes three parts: measurement of aerodynamic force, flow visualization and PIV experiment. It is found that when the twin vertical tails are located on the back inner of fighter's body, the maximum lift coefficient is max. The process of vortex breakdown and flow character are very similar with the state of no vertical tails. This indicates that the main effect of twin vertical tails on wing vortexes promote the vortex breakdown, so the aerodynamic characteristics of fighter will be deteriorated.