Nashrieh Shimi va Mohandesi Shimi Iran

Nashrieh Shimi va Mohandesi Shimi Iran

Numerical Investigation of the Effect of Boron Particle Diameter and Oxygen Concentration on the Combustion Mechanism in a Solid Fuel-Rich Propellant

Document Type : Research Article

Authors
Aliakbar Jamali
Abolfazl Yazdani
Department of Chemical Engineering, Faculty of Technology and Engineering, Imam Hossein. University, Tehran, I.R. IRAN
Abstract
In the present study, ignition and combustion procedures of boron particles were simulated with various diameters in a combustor by particle trajectory model. The reaction rate of pyrolysis product from solid fuel (a combustible gas) is calculated by the eddy-dissipation model. The ignition and combustion mechanism of boron particles is simulated by King Model. The effects of particle diameter and oxygen concentration on the combustion mechanism of boron particles were studied in the combustor. The flow field structure and performance properties including thrust, specific impulse, and characteristic velocity were analyzed by examining the simulation results of the reacting flow field in the chamber. The results concluded that reducing the diameter of boron particles from 25 to 5 microns reduces the ignition stage time and increases their combustion efficiency. The ignition distance from the inlet of the combustor increases with increasing particle size. When the bypass air ratio is constant, the combustion efficiency of the particles decreases as the diameter of the boron particles increases. For particles with diameters of 15 and 25 microns, the combustion efficiency of boron particles increases with increasing bypass air ratio. The highest particle combustion efficiency occurs when the particle diameter is 5 microns.
Keywords
Hydroxyl-terminated polybutadiene (HTPB)
Boron particles
Fuel-rich propellant
performance characteristics
Ramjet

Subjects

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