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 (L/D < 1) is simulated and analyzed varying with relative rotation velocity at high Re number (1×105 ≤ Re ≤ 3×106). 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 Cd of the short cylinder is more sensitive to the change of Re. With the increase of Re, the Cd 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 ω, 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 cd shows a ‘W’ shape, and the waveform of the cl is ‘M’.
Highlights
The short cylindrical terminal sensitive bullet (TSB) consists of a short cylindrical warhead and an external detector [1,2,3]
Based on the design conditions, the Reynolds number is at 2×105 ≤ Re ≤ 1×106, which belongs to the low-drag subcritical region obtained by the classic cylinder flow test
The results show that the cylinder aspect ratio and Reynolds number have a great influence on the vortex shedding mode
Summary
The short cylindrical terminal sensitive bullet (TSB) consists of a short cylindrical warhead and an external detector [1,2,3]. The flow field structure characteristics of the rotating short cylinder with two free ends is analyzed through numerical simulation. The influence of length-to-radius ratio L⁄D , Re number and relative rotation velocity α on the flow field structure and aerodynamic coefficients around short cylinder with two free ends is studied. On this basis, the influence of the detector on the aerodynamic characteristics and flow field structure of the TSB is studied
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