An investigation on characteristics of base drag reduction with base bleed in subsonic and transonic speeds

An investigation of wind t unnel tests of base bleed is conducted,in order to research the characteristics of base drag reduction with base bleed burning H2+air and base bleed cold air in subsonic and transonic speeds. The Mach numbers are 0.71～1.55.From results o f it,the base drag reduction rate with base bleed cold air is low,but it with ba se bleed burning H2+air is much higher than base bleed cold air, that its maxi mum of base drag reduction rate is 40%～120%.It is shown that reducing the base drag of projectile and increasing the range of it are possible by means of base bleed burning in subsonic and transonic speeds.