OPTIMIZING THE FORM FUNCTION OF GUN PROPELLANTS

摘要

Progressivity, i.e. gain in burning area, of multi-perforated propellant grains is graphicallyshown to have a maximum for certain dimension ratios. Form functions, amount of slivers,and optimum dimensions for some basic grain types are presented. The effect of finitemanufacturing precision on form function, progressivity, and amount of slivers is estimatedapproximatively. This study of form functions is strictly geometric, no physical effects ofcombustion, like flame spread, combustion inside perforations, or erosive burn rate, aretaken into account.