Analysis of Dispersion of Base Bleed Projectile

Abstract

The dispersion of shot is an important performance index of a base bleed projectile. Correctly estimating the characteristic quantity of dispersion of the base bleed projectile, effective reducing the dispersion of the projectile, reasonably determining the dispersion index are problems of great concern for projectile designers and ballisticians. In this paper, the dispersion of the base bleed projectile has been estimated, and the methods for reducing the influence of nutation and the drag dispersion with base bleeding and the highaltitude wind on the dispersion of projectile have been introduced. Then, the effects of various factors on the dispersion of projectile have been analyzed, and it is pointed out that the initial velocity dispersion, nutation dispersion, gusty wind and drag dispersion with base bleeding are the main factors affecting dispersion of projectile. Because the drag of base bleed projectile is so weak that the effect of the drag dispersion on over all-dispersion will be more sensitive. Factors affecting dispersion of the base drag with base bleeding and the influence of the dispersion of ignition time on over all-dispersion have been discussed. The methods of reducing dispersion have been stated, and the methods of determining the index of dispersion and of making reasonable distribution have been demonstrated. The firing test have proved that the theory and methods given in this paper are verified.