Study Of The Roll Characteristics Of The Projectile Which Has The Tails With The Cant Angle

In order to improve the flight stability and the firing intensity of the fin-stabilized projectile, we often to deflect the fins or bevel an angle on the fins, enabling that the projectile could obtain an active roll moment, so that it could rotate at a low-speed. The ability to accurately predict the roll moment characteristics attributable to the fin cant angle is important to the projectile designer.In this thesis, the rolling moment characteristics of fin-stabilized projectile which with the inclined angle of empennages had been studied. In previous work, the engineering estimating and numerical simulation methods had been developed and applied to estimate the Static/dynamic aerodynamic coefficient of the model fin-stabilized stabilized projectile. In addition, the flow field results and the aerodynamic results were analysed. And then I built the Six degrees of freedom ballistic equation, respectively substituted the independent aerodynamic results of the engineering estimating and the results which come from the combination of the numerical simulation and engineering estimation into the equation, so that we can simulate the ballistic. We got the rules that roll angular velocity of the fin-projectile changing with time, and as well as the data of balancing speed. The roll characteristics of the fin-stabilized projectile has also been analyzed. Finally, Comparisons were made with data obtained from range firings. The computed steady-state roll rate and the spin histories agreed well with the values obtained from range firings. This is a powerful proof that the Six degrees of freedom ballistic model is proper, it's also proved that the engineering estimation and the numerical simulation are relatively appropriate indirectly. The eventual goal of this paper is to allow the projectile designer to compute roll characteristics about given projectile designs accurately and efficiently resulting in improved performance of future projectile designs.