Hypersonic wind tunnel drop-model test on cover ejection from cargo projectile at large angle of attack

Hypersonic wind tunnel drop-model tests were conducted at Mach 5 to investigate the separation characteristics of cover ejection from cargo projectile at large angle of attack(25°). In the test, the whole separation process was observed. The motion trajectory and displacement curves of the covers in the separation process are analyzed. The comparison of the separation characteristics is made between the covers on the windward side and the leeward side. The motion trajectory of the covers is quite different between the windward side and the leeward side, but both motion trajectories of the covers on the two sides can be divided into two stages. For the covers on the windward side, the displacement of y orientation is dominant at stage Ⅰ, while x orientation becomes dominant at stage Ⅱ. For the covers on the leeward side, the displacements are approximately equivalent for x and y orientation at stage Ⅰ, while x orientation becomes dominant at stage Ⅱ.The x orientation displacements for covers on both sides can be evidently divided into two stages. At stage Ⅰ, the displacements change slowly, while those increase rapidly at stage Ⅱ. The y orientation displacements for covers on both sides have no obvious stage transition, but the y orientation velocity on the windward side is larger than that on the leeward side. Similar to x orientation displacements, the total displacements for covers on both sides can also be divided into two stages, and they also change slowly at stage Ⅰ, and then increase rapidly at stage Ⅱ.