小突片强化混合结构三维流场数值模拟

Numerical simulation on three dimensional nozzle flow field with tabs

采用Roe通量差分分裂格式对带有小突片的轴对称收 扩喷管内外流场进行了数值模拟。小突片形状有三角形和梯形 ,数目为 2个或 4个 ,堵塞比为 0 0 2 ,0 0 4和 0 0 6 ,相对高度为 0 0 8和 0 16 ,安装角分别为 12 0° ,135°和 15 0°。计算结果表明 :在喷管出口安装 2个或 4个小突片能使得喷管下游内外流掺混时间及掺混距离大为缩短 ,而对喷管的推力系数影响不大。

The Reynolds-averaged Navier-Stokes equations were solved numerically by Roe's flux difference splitting scheme for three-dimensional nozzle flow field with tabs. Several geometrical changes of tabs, such as tab shapes, areas, heights and azimuthal angles, are considered. Use of tabs clearly has significant potential to reduce supersonic jet noise and infrared radiation.