| || Burn-rate Measurement on Small-scale Rocket Motors
Author : Maggi, F. ;Bandera, A;DeLuca, L. T. ;Subith, V.S. ;Annovazzi, A.
Source : Defence Science Journal ; Vol:56(3) ; 2006 ; pp 353-367
Subject : 623.5 Armaments and Ballistics;629.76 Rockets and Missiles ;662.3 Propellants
Keywords : Burn-rate measurement;Rocket motors;Small-scale rocket motors;Data reduction ;Ballistic behaviour;Ballistics
Abstract : Small-scale rocket motors are widely used by propulsion industries to carry out burn rate measurement for a variety of needs. Several automated data-reduction procedures have been implemented to derive burn rate from pressure-time profiles resulting from experimentation. Even if these are easy and fast to use, these procedures are not completely reliable in that these measure only the average behaviour of a motor. A new model has recently been proposed to overcome this problem. However, it was soon noticed that the results depend on the propellant grain production and forming processes even if the motor hardware is the same. A series of propellant grains has been produced to be sampled to map the local ballistic behaviour and changes introduced by the manufacturing process. In this study, sampling and testing procedures are reported and the results of an almost complete grain mapping are discussed.