冲压增程弹丸冷态气动阻力特性分析

冲压增程弹丸冷态气动阻力特性分析

骆晓臣;鞠玉涛;周长省

【期刊名称】《空气动力学学报》

【年(卷),期】2012(030)004

【摘要】The distributions of internal and external aerodynamic drags acted on a ramjet projectile were analyzed under the passive flight conditions from M2. 0 to Ml. 5 by the methods of flight experiments and numerical simulations. Comparison between the passive flight experimental measurements and the numerical simulations revealed that the aerodynamic drag obtained by these methods agreed within 6%. The results of numerical simulations show that the external drag dominates the total drag acting on the ram-jet projectile, and 95% of the total drag is the external drag. In the total drag, the pressure drag is 85%, which exceeds the friction drag greatly. It was found that 90% of the external drag is the pressure drag. The aerodynamic drags obtained from the passive flight experimental measurements can be used as the external drags directly when the thrust of ramjet engine is designed. The important approach to reduce the drag acted on the ramjet projectile is to reduce the projected areas of the external cowl of inlet and fore-body of projectile in the direction of the incoming flow.%以一冲压增程弹丸为例,在马赫数2.0到2.5的冷态飞行条件下,采用飞行试验结合流动仿真的手段,分析了作用在弹丸内、外表面的气动阻力分布.数值仿真所得阻力