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国际能源材料和化学驱动期刊
ESCI SJR: 0.149 SNIP: 0.16 CiteScore™: 0.29

ISSN 打印: 2150-766X
ISSN 在线: 2150-7678

国际能源材料和化学驱动期刊

DOI: 10.1615/IntJEnergeticMaterialsChemProp.v1.i1-6.20
pages 1-16

Base Bleed Technology in Perspective

G. V. Bull
Group President, SRC

ABSTRACT

The general fluid mechanic mechanism for flow about axisymmetric bodies (shell shapes) is reviewed, with reference to the very early experimental work (circa 1900) which resulted in determination over the subsonic−supersonic range of the drag−Mach number relationship.
A numerical example of drag component values for one type of modern shell is presented, to illustrate the major significance of the base drag component. The long range 210mm Paris gun shell of 1918 is discussed, being of interest as perhaps, an outer bound to the envelope of shell trajectories (apogee : 43 km, range 127 km).
The history of base injection studies is sketched briefly through early post−war work to the present systems. Various postulated wake flow models are discussed. Firing results for the minimum drag forebody projectile (commonly known as the ERFB projectile) are presented showing range increase with base bleed in the order of 30%.


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