动能弹垂直再入可行性研究

Feasibility Research on Perpendicular Reentry of Kinetic Energy Payload

根据"上帝之杖"弹道式再入动能打击假想,利用自适应伪谱法分别研究有限推力制动和连续小推力制动作用下动能弹所能达到的最大再入倾角,分析过渡段实现动能弹垂直再入的可行性。通过计算发现,在再入倾角接近垂直的情况下,无论采用哪种制动方式,随着动能弹质量的增加,燃料消耗量急剧增加,动能弹与燃料质量比达到1:9;采用有限推力制动时,能够在较短时间内以接近垂直的倾角再入,但再入速度较低,约3.5 km/s;而采用连续小推力作用时,再入倾角接近垂直,再入速度较高,约7 km/s,但发动机工作时间长,过渡段飞行时间超过1 h。

Referring to the supposition of ballistic reentry for kinetic energy attacking named as ＂God＇s Rod＂, the max reentry angle of payload controlled by limit thrust and continuous low-thrust was researched using adaptive pseudo-spectral method, and the feasibility for perpendicular reentry of payload was analyzed. The result illuminated that whatever de-orbit model was used to ensure the reentry angle of payload close to vertical, the consumption of fuel increased sharply with the payload mass, the mass ratio of payload to fuel attained 1：9. When a limit thrust was used for de-orbit, the reentry angle could get close to perpendicular in a short time, but the velocity was only 3.5 km/s. However, when the continuous low-thrust was used, the reentry angle could be close to vertical with a higher velocity about 7 km/s, but the work time of engine exceeded 1 hour.