|M.Sc Student||Ron Scheuer|
|Subject||Thermodynamic Aspects of Boron Combustion in Propulsion|
|Department||Department of Aerospace Engineering||Supervisor||Professor Emeritus Gany Alon|
Boron is a metal element, exhibiting a remarkable
theoretical heat of combustion in air on both gravimetric and volumetric basis,
exceeding that of common hydrocarbon fuels. Therefore, it is
highly attractive for use as a fuel additive in air breathing propulsion,
mainly in ramjet engines. Despite the promising potential, practical boron
containing fuels often demonstrate low
motor performances, mainly due to the existence of a
molten B2O3 layer, which covers the
boron particle entirely from the beginning of the
ignition phase. In order to attain ignition and stable
this layer must be completely removed.
The main objective of this research
The database enabled the construction of an envelope indicating the boundaries between the operation points in which the evaporation of liquid B2O3 is possible and those in which such evaporation is impossible.
1. Relatively broad ranges of practical operating conditions do not enable complete boron combustion because of thermodynamic blocking of B2O3 evaporation due to saturation conditions. Such situations may result in low combustion efficiencies.
2. Distributed air inlets as well as working at appropriate equivalence ratios can help recovering a larger fration of the combustion energy of boron.