Evaluation of polyurethane binder additivated with paraffin and tested with a swirl injector

Abstract

The fuel was synthesized with polyurethane (binder) based on pre-polymer technology modified with castor oil with the addition of 30% of paraffin and 10% of aluminum powder. An axial and a swirl injector were used. The regression rates doubled with the addition of paraffin and the mechanical properties increased drastically. Thrust measurements indicate that the addition of paraffin increased thrust at about 57% and regression rates at about 70%. The mixture that produced the best ballistic parameters was polyurethane plasticized with castor oil and 30% w/w of paraffin with gaseous oxygen injected with a swirler. The swirl injector improved the efficiency and regression rate values. © 2012 by Flowtest Pesquisa Aeroespacial.