|关键词: 可回收火箭 低空逆向喷流 高空逆向喷流 气动特性 数值仿真
|Effects of opposing jet on aerodynamic characteristics of reusable rocket
LIU Hao, LI Jun, FENG Gang
Expace Technology Co.，Ltd，Wuhan 430040，China
|When reusable rocket returns， it needs to rely on engine ignition deceleration. In order to obtain the change rule of aerodynamic performance of the rocket under the condition of opposing jet， the CFD simulation was taken under low altitude and high altitude. The effects of free stream flow Mach number and angle of attack on aerodynamic performance of the rocket were analysed. At the same time the single nozzle and multiple nozzle jets simulations were carried out. The results show that at low altitude， the absolute value of axial force coefficient decreases under opposing jet condition and the axial force coefficient decreases with the increase of the number of jet flow. Under the condition of small angle of attack， the opposing jet caused the pressure center to move forward greatly， and the pressure center moved forward more with the increase of the number of starting engines. Under the condition of high altitude， there was strong mutual interference between jet expansion zone and incoming flow， which resulted in the obvious axial force coefficient decrease. The absolute value of axial force coefficient was within 0.04.The absolute value of normal force coefficient was less than 0.1 within the range of 0°~10° angle of attack. With the increase of static pressure of incoming flow， the range of angle of attack with the absolute value of normal force coefficient less than 0.1 decreased.
|Key words: Reusable rocket Opposing jet under low altitude Opposing jet under high altitude Aerodynamic characteristics Numerical simulation