Projectile

About: Projectile is a research topic. Over the lifetime, 13047 publications have been published within this topic receiving 115563 citations.

Numerical investigation of oscillatory instability in shock-induced combustion around a blunt body

Abstract: The basic characteristics of oscillatory instabilities of shock-induced combustion around a spherical projectile flying at hypersonic speed is investigated on the basis of numerical simulation using a two-step chemical reaction model. A series of simulations is conducted to understand the mechanism of these oscillatory instabilities. The oscillatory instabilities are clearly observed when the projectile radius is about 7.5-10 times the induction length

Structural fragments and explosions in industrial facilities: Part II – Projectile trajectory and probability of impact

Abstract: When dealing with risk analysis, due to industrial explosions, it is required to collect and develop a detailed knowledge about the source terms (features of the generated fragments), the impact terms (fragment trajectory) as well as the target/projectile interaction The present paper focuses on the fragment trajectory and the possible impact over industrial targets erected in the vicinity A preliminary study (Part 1) has been devoted to develop the probabilistic distributions for the source terms According to the fragment features at their departure from the source, the trajectory is evaluated under the combined effects of the inertia, the gravitation and the aerodynamics (drag and lift): translational as well as the rotational movements of the fragments are analyzed Three fragment shapes, generated by either cylindrical or spherical vessels explosions, are investigated end-cap, oblong end-cap and plate For illustrative purposes three target shapes are considered: cylindrical, ellipsoidal or cubic vessels that can be impacted by the generated fragments

Device for the protection of targets against projectiles

Abstract: 1. In a device for protecting a target from attack by a projectile the combination comprising a linear shaped charge to generate a jet sheet of high velocity particles, the plane of symmetry of said shaped charge disposed in spaced relation to said target and substantially at right angles to the projectile trajectory, a detonator to initiate explosion of said shaped charge, a source of electrical energy to fire said detonator, and a switch responsive upon impact of said projectile to establish connection between said source of electrical energy and said detonator said switch comprising a plurality of plates disposed in parallel planes and distortable by said projectile impact.

All-Speed Time-Accurate Underwater Projectile Calculations Using a Preconditioning Algorithm

Abstract: An algorithm based on the combination of time-derivative preconditioning strategies with low-diffusion upwinding methods is developed and applied to multiphase, compressible flows characteristic of underwater projectile motion Multiphase compressible flows are assumed to be in kinematic and thermodynamic equilibrium and are modeled using a homogeneous mixture formulation Compressibility effects in liquid-phase water are modeled using a temperature-adjusted Tait equation, and gaseous phases (water vapor and air) are treated as an ideal gas The algorithm is applied to subsonic and supersonic projectiles in water general multiphase shock tubes, and a high-speed water entry problem Low-speed solutions are presented and compared to experimental results for validation Solutions for high-subsonic and transonic projectile flows are compared to experimental imaging results and theoretical results Results are also presented for several multiphase shock tube calculations Finally, calculations are presented for a high-speed axisymmetric supercavitating projectile during the important water entry phase of flight