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7728132 
Journal Article 
Combustion Characteristics of Ramjet Fuel Grains with Boron and Aluminum Additives 
Jung, W; Baek, S; Park, J; Kwon, S 
2018 
Yes 
Journal of Propulsion and Power
ISSN: 0748-4658 
34 
4 
1070-1079 
English 
WOS:000435924500023 
An experimental investigation of the effect of boron (B) and aluminum (Al) additives to fuel-rich propellant for a solid fuel ramjet application was performed. In this research, depending on the composition of metal particles, three types of fuel grains with 15 wt % ammonium perchlorate particles were prepared and tested. To provide a short ignition delay, an ignition support material consisting of NC/BKNO3 and a composite propellant were coated on the fuel grain. For the test, an oxidant gas having a controlled temperature and pressure and an oxygen composition close to that of the air in a ramjet combustor was supplied using an ethanol-blended hydrogen peroxide (H2O2) gas generator. Air simulant gas was supplied with an average mass flow rate near 150 g/s and a Mach number of 0.21 in the fuel grain port. Through the test, the noticeable effect of B particles on combustion was confirmed by a high regression rate over 0.5 mm/s and combustion efficiency over 80%. Al particles were not effective additives individually; however, Al particles contributed to the ignition of B. In addition, metal oxide particle deposits on the nozzle confirmed the existence of a two-phase flow. Copyright © 2018 by the American Institute of Aeronautics and Astronautics, Inc. All rights reserved.