Base bleed or base burn (BB) [1] is a system used on some artillery shells to increase range, typically by about 20%–35%. It expels gas into the low-pressure area behind the shell to reduce base drag (but does not produce thrust, unlike rocket-assisted projectiles ).

Base bleed technology was developed to reduce the amount of base drag on a projectile, thereby increasing the achieved range. The drag is reduced by a gas generator located on the base of the projectile. Once ignited, the gas generator bleeds hot gas into the projectile's wake, which causes the flow of air at the base to be less turbulent.

Jul 7, 2011 · An artillery projectile in flight forms a low pressure area immediately behind the projectile which creates a force (commonly called "base drag") which lessens the velocity of the...

Abstract: Base bleed is a system for base drag reduction of projectile by gas injection into base area. The gas injecting through orifice is generated by combustion of solid propellant grain. Base bleed output mass flow rate depends on the chamber pressure, the pressure into which jet exhausts, time and spin rate. An analytical interior ballistics

bleeding (BB) is one of the concepts used to decrease air resistance during projectile flight in air and, consequently, increase range. This paper studies the effect of BB on projectile range and evaluates BB unit

Base bleeding is an effective means to decrease the base drag via injecting hot burnt gases behind the projectile base. These gases raise the wake region pressure resulting in base drag reduction.

work concentrates on the so-called base bleed phenomena in which only a relatively small mass of gas is injected from the base. Modern U.S. Army projectiles utilize injection gases generated by burning a fuel

The artillery projectile range can be increased by decreasing the aerodynamic drag by means of ejecting hot gas from a base-bleed unit into the base flow of the projectile. A new base-bleed/hollow-base construction is suggested.

Jul 20, 2019 · A base bleed reduces the base drag by injecting gas, generated by burning propellant at the base area. To achieve base bleed, a gas generator or base bleed unit is attached to the projectile which is in addition to the main propelling charge (providing thrust).

Abstract—base bleed is a common technique that is adopted to reduce drag on projectiles. The degree of drag reduction can be estimated either by expensive live firings or through numerical simulation and engineering techniques. In this paper, drag of 155mm K307 projectile is calculated with dummy and live base bleed units in two approaches.