Three-dimensional numerical investigation of hypersonic projectile launched by railgun on transitional ballistics

Hirotaka Kasahara, Akiko Matsuo

研究成果: Article査読

抄録

Supersonic accelerators use sabots to suppress bore balloting. However, sabot separation induces flight deviation in projectiles owing to their interactions with fluids and shock waves. A seamless calculation of the acceleration phase in the tube and the full separation process using 3-D computational fluid dynamics coupled with rigid body dynamics is presented in this study to investigate the shock-wave interactions around a railgun-launched projectile. The railgun acceleration induced a normal shock wave propagating ahead of the projectile; when the projectile reached the tube end, a substantial expansion at the muzzle generated two shock waves, namely, a spherical precursor shock wave and a Mach disk, outside the tube. Aerodynamic forces on the projectile/sabot decreased to almost zero just after the tube exit, with the ambient fluid around the tube being faster than the projectile by the substantial expansion. After exiting, the projectile penetrated the precursor shock wave at t 0.15 ms; this increased the aerodynamic forces acting on the projectile, initiated sabot separation, and generated multiple shock-wave interactions, which induce unsteady aerodynamic loads on the projectile.

本文言語English
ページ(範囲)919-935
ページ数17
ジャーナルJournal of Spacecraft and Rockets
58
4
DOI
出版ステータスPublished - 2021

ASJC Scopus subject areas

  • 航空宇宙工学
  • 宇宙惑星科学

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