Numerical analysis on aerodynamic characteristics of short cylindrical terminal-sensitive bullet

Abstract

Abstract. The flow-induced lateral vibration phenomenon of the terminal sensitive bullets (TSB) when it is dispersed by the airborne distributor is taken as the research background. Based on the Fluent, the flow around a rotating short cylindrical TSB ( ⁄ < 1) is simulated and analyzed varying with relative rotation velocity at high Re number (1×10 5 ≤ ≤ 3×10 6 ). The simulation results show that the flow field structure of the short cylinder with two free ends is different from the symmetry of the short cylindrical flow field with one free end, and there is no horseshoe vortex. Compared to the long cylinder with double free ends, the of the short cylinder is more sensitive to the change of Re. With the increase of , the of the short cylinder decreases, and the value is between the infinite cylinder and the sphere in the non-critical region. When the short cylinder rotates at the angular velocity , the top vortex bends and deforms to a 'C' shape on the leeward side where the fluid is accelerated. Due to the periodic disturbance of the detector, the aerodynamic coefficient of the rotating TSB is periodically vibrated. In a single cycle, the waveform of the shows a 'W' shape, and the waveform of the is 'M'.

Numerical and Experimental Analysis of Drag and Lift Forces on a Bullet Head

“…A series of conceptual analyses and hypothetical studies of aerodynamic characteristics have been conducted in domestic and foreign research on bullet head deflection [8]. Due to the extensive use of long-range bullets worldwide, the analysis of the aerodynamic properties of bullets has become one of the most significant focuses for its improvement [7,9,10].…”