Type: Master Graduation Project
Student: Martijn van Stiphout
Duration: Oct. 2016 – May 2017
The first practical project in the field of metal fuels at Eindhoven University of Technology. The main objective of this project is the design, building, and testing of a small-scale aerosol dispersion and combustion system. Such system will allow characterization of combustion properties of different metal aerosols, something only very little about is known. Its small scale allows for close monitoring of the whole flame with normal optical techniques and detailed characterization of the phenomena at play. The design of the burner is based on an apparatus previously designed by Dr. Y. Shoshin, one of the key people in the current metal fuel research at our university. Particles are dispersed by applying an electric potential between a horizontal element containing the metal powder and a parallel electrode with a small hole in the middle. The particles become charged and attracted by the (grounded) parallel electrode, lose charge and fall back again. Only small gas-flow is required to entrain the particles and generate an aerosol jet through the hole in the electrode (approximately 1 mm in diameter). The laminar particle-laden jet is then ignited and stabilized using a shroud-flow with significant lower flow velocity, but larger volumetric flow. By using this electrostatic dispersion method, the whole system is kept compact, only small volumetric flows are necessary and particle number density could be easily changed. One could imagine that in a larger flame, the region just below the flame-front is preheated by the energy released into the flame. In small-scale flames, this effect is much smaller. In order to take such effects into account and to study the influence of ambient temperature to flame properties, the shroud-flow could be preheated up to 450 degrees Celsius.
Ir. M. van Stiphout successfully graduated with his thesis on this subject.