Numerical study on blast flowfields induced by supersonic projectiles discharged from shock tubes

Abstract

Characteristics and measurement of supersonic projectile shock waves by a 32-microphone ring array Rev. Sci. Instrum. 82, 084902 (2011);In this paper we report on a numerical study of the blast flowfield generated by a supersonic projectile released from the open-end of a shock tube into ambient air. The Euler equations, assuming axisymmetric flows, were solved using a dispersion-controlled scheme implemented with moving boundary conditions. Two initial test cases were calculated. One of them is for validation of the numerical method and the other for verification of the moving boundary conditions. After good agreement was achieved, four further cases were calculated for examining effects of various projectile speeds and different release times of the projectile after the precursor shock wave was discharged. The present numerical study confirms that complicated transient phenomena exist in the initial stages shortly after projectile release, and that the blast flowfield is much more complex than that which can be inferred from muzzle blast studies where combustion products obscure the flow.

Coupled fluid–solid interaction under shock wave loading

“…The same fluid conditions cited in [35] forms in front of the projectile, which interacts with the initial shock from the tube. Eventually, the projectile travels through the shock front that emerged from the tube.…”

“…We present results for the 2D projectile problem posed by Jiang et al [35]. Here, a square projectile traveling at Mach 4 is ejected from a shock tube.…”

“…Here, a square projectile traveling at Mach 4 is ejected from a shock tube. The computational domain used here is similar to that used in [35] and is shown in Figure 31. This domain is meshed with 319 000 4-node quadrilateral elements.…”

Comparison-speed liquid jets

“…The present schlieren photography confirms the previous explanation. The aerodynamics of a supersonic projectile overtaking a gun muzzle blast wave can be seen in the work of Jiang et al (1998).…”

Flow Around a Conical Nose with Rounded Tail Projectile for Subsonic, Transonic, and Supersonic Flow Regimes : A Numerical Study

“…These interactions affect the aerodynamic characteristics drastically. The unsteady flow-field of a projectile launch has been studied by many investigators [7][8][9][10][11] . Chand and Panda 12 studied the projectile trajectory using simplified point mass approach which considered only the drag force and the gravity force.…”