REPUBLIC OF SERBIA

MINISTRY OF DEFENCE

www.mod.gov.rs

MINISTRY OF DEFENCE

Material Resources Sector

Defensive Technologies Department

Military Technical Institute

www.vti.mod.gov.rs

influence of THE ignition mixtures GRANULATION on rocket motor ignition

JOVICA NEŠIĆ

Military Technical Institute, Sector for Materials and Protection, Belgrade, jovicanesic@yahoo.com

Nikola GLIGORIJEVIĆ

Military Technical Institute, Rocket Armament Sector, Belgrade, nikola.gligorijevic@gmail.com

JOVICA BOGDANOV

University of Defence, Military Academy, Belgrade, jovica.bogdanov@va.mod.gov.rs

SAŠA ŽIVKOVIĆ

Military Technical Institute, Rocket Armament Sector, Belgrade, sasavite@yahoo.com

BOJAN PAVKOVIĆ

Military Technical Institute, Rocket Armament Sector, Belgrade, bjnpav@gmail.com

GORAN MARJANOVIĆ

 Military Technical Institute, Rocket Armament Sector, Belgrade, milicagoran@gmail.com

Abstract: The aim of this study was to evaluate whether there is a possibility to affect the regime of rocket motor ignition by controlling the particle size of the ignition mixtures. The basic assumption, adopted as an axiom was that the pressure gradient in the manometer bomb, in the conditions without any rocket propellant, significantly affects the pressure increase mode in the rocket motor with real propellant grain. In various tests in the manometric bomb, igniters with the same weight but different particle sizes of the mixture were tested. Pressure distribution was measured. In the first group of tests only the pressure distributions due to different granulations of the mixture were measured. Unexpectedly, in the tests with different particle sizes, no differences in the regimes of pressure rise were detected. In the second series of tests the mixture was prepared in the form of different pressed tablets, with various shapes and sizes. All the igniters were also made with the same weight, to be able to compare each other. In addition, two different mixture compositions were tested. It has been shown that the shape of the tablets, as well as composition of the mixture, can affect the pressure rise, which provides the opportunity to significantly control the process of rocket motor ignition.

Keywords: Ignition, Manometric bomb, Mixture, Pressure, Granulation, Propellant Grain.