关键词: 导弹模型, 横向喷流, 超声速, 动态气动特性, 放大因子

Abstract: To investigate the effect of motion on transverse jet interaction, steady and unsteady numerical simulations are performed on a missile model at fixed angle of attack and with uniform pitching motion.To study the differences between steady and unsteady cases, this paper analyzes the characteristics of transverse jet interaction, including typical interaction flow topology in the vicinity of nozzle exit, streamlines and pressure distribution on model surface, pressure changes along centralline. The results show that the effect of pitching motion and its angular rate on flow topology, pressure platform, and rudder surface varies with the change of the motion direction and the range of angle of attack. At low and moderate angles, the effects are mainly in the upstream separation area and rear bending barrel shock, where as the location of bow shock wave changes significantly at high angle of attack. Unsteady hysteresis in aerodynamic characteristics and transverse jet interaction are induced by pitching motion and has been enhanced with an increasing pitch angular rate. The pitch moment amplification factor is influenced more significantly by motion during high angles than during low angles.

Key words: missile model, transverse jet, supersonic, dynamic aerodynamic characteristics, amplification factor