关键词: 冲压增程弹+;进气道;旋流数+;理论分析+;数值仿真

Abstract: In order to study the high-speed spinning effect on the ramjet assisted range projectile,the swirl number in the inlet was theoretically analyzed at the condition of zero angle of attack.The analytical formula of swirl number was obtained.In order to test the rationality of the hypothesis and analyze the error of the analytical formula,the flow field of an axisymmetric double cone-shaped inlet was numerically simulated.It was concluded that the swirl number at the front of the inlet was very small,the air mass flow rate was nearly the same as the condition of no spinning.The swirl number at the outlet of the inlet calculated with the analytical formula was always larger than that of numerical simulation,and the error of the analytical formula increased with decreasing the back pressure.The swirl number at the outlet of the spinning ramjet assisted range projectile inlet was usually smaller than 0.2 and the flow field in the solid fuel ramjet was weak swirl flow.Thus,the spinning has little effect on the ramjet.

Key words: Ramjet assisted range projectile+;Inlet;Swirl number+;Theoretial analysis+;Numerical simulation