Ammonia borane based-propellants

J. G. Lee, M. Weismiller, T. L. Connell, G. A. Risha, R. A. Yetter, P. D. Gilbert, S. F. Son

Research output: Chapter in Book/Report/Conference proceedingConference contribution

7 Scopus citations

Abstract

The combustion of ammonia borane (AB) is studied as a potential fuel or propellant ingredient for propulsion applications. Theoretical equilibrium analyses indicate that due to the high hydrogen content of AB and moderate exothermicity of decomposition, it has the potential to boost Isp, thereby increase performance. Various concept experiments are performed with AB as an ingredient in liquid and solid fuels as well as an ingredient in conventional and novel composite propellants. Results show that burning rates are generally not affected or increased slightly with the addition of AB. In liquid fuel droplet experiments where AB is dissolved in methanol, decomposition of AB can occur below the vaporization temperature of the methanol and potentially lead to droplet fragmentation during combustion. In paraffin-based solid fuels, AB does not affect the regression rate when burned with pure oxygen, but has the potential to improve rocket performance in terms of specific impulse due to AB's desirable combustion products. From spectroscopic emission measurements significant amounts of BO2 are observed indicating conversion of elemental boron to boron oxide products. In mixtures of stoichiometric aluminum and water, the burning rate increased with AB addition as long as it remained dissolved in the water. In preparation of various formulations containing AB, ammonia borane was found to have material compatibility problems with several ingredients including nanometer metal oxide particles, such as copper oxide and molybdenum trioxide, and cross linking agents for hydroxyl-terminated polybutadiene.

Original languageEnglish (US)
Title of host publication44th AIAA/ASME/SAE/ASEE Joint Propulsion Conference and Exhibit
StatePublished - Dec 1 2008
Event44th AIAA/ASME/SAE/ASEE Joint Propulsion Conference and Exhibit - Hartford, CT, United States
Duration: Jul 21 2008Jul 23 2008

Publication series

Name44th AIAA/ASME/SAE/ASEE Joint Propulsion Conference and Exhibit

Other

Other44th AIAA/ASME/SAE/ASEE Joint Propulsion Conference and Exhibit
CountryUnited States
CityHartford, CT
Period7/21/087/23/08

All Science Journal Classification (ASJC) codes

  • Aerospace Engineering
  • Control and Systems Engineering
  • Space and Planetary Science
  • Energy(all)
  • Electrical and Electronic Engineering
  • Mechanical Engineering

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