The Analysis Of The Aerodynamics Characteristics And Stability For The Samara-type Terminal-sensitive Ammunition Without Parachute

This paper mainly studies the design of the aerodynamics characteristics and stability for the samara-type terminal-sensitive ammunition without parachute. This kind of terminal-sensitive ammunition installs a tip-weighted single-wing. It realizes stable scanning by using the asymmetrical aerodynamic force caused by the strong mass and aerodynamic asymmetries of projectile. The aerodynamic force provides uniform falling resistance to bullets, roll torque needed to generate stable scanning and maintain a steady speed.Firstly, this paper sets up the physical model of samara-type terminal-sensitive ammunition without parachute which consists of a cylinder body, single wing and tip weight. Set up the model of two body motion dynamics mathematical model based on force analyze and also solve the feasibility problem of installing a tip-weighted single-wing to realizing stable scanning. Secondly, set up the aerodynamics shape for the samara-type terminal-sensitive ammunition without parachute and analyze the aerodynamics characteristics by using Fluent. All parts of system are discussed in detail for a greater influence on the aerodynamic characteristics of the structural parameters (such as the wing shape and installation Angle, to the flow direction, etc.) on the aerodynamic characteristics (drag coefficient, lift coefficient and the tail torque coefficient, etc.).Finally, set up the angular motion model of samara-type terminal-sensitive ammunition without parachute. Determine the function relationship between aerodynamic characteristics and angle of attack. Analyze the stability through the analysis of high and low Angle of attack and the azimuth Angle of attack.