Combustion characteristics of ramjet fuel grains with boron and aluminum additives

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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.
Publisher
AMER INST AERONAUTICS ASTRONAUTICS
Issue Date
2018-07
Language
English
Article Type
Article
Keywords

WATER-VAPOR; PARTICLES; IGNITION; OXYGEN

Citation

JOURNAL OF PROPULSION AND POWER, v.34, no.4, pp.1070 - 1079

ISSN
0748-4658
DOI
10.2514/1.B36919
URI
http://hdl.handle.net/10203/244279
Appears in Collection
AE-Journal Papers(저널논문)
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