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International Journal of Energetic Materials and Chemical Propulsion
ESCI SJR: 0.149 SNIP: 0.16 CiteScore™: 0.29

ISSN Imprimer: 2150-766X
ISSN En ligne: 2150-7678

International Journal of Energetic Materials and Chemical Propulsion

DOI: 10.1615/IntJEnergeticMaterialsChemProp.v5.i1-6.560
pages 523-532

DIFFUSION FLAME STRUCTURE OF HNF SANDWICHES

G. G. M. Stoffels
Thermal and Fluids Sciences, Department of Applied Physics, Delft University of Technology, Lorentzweg 1, 2628 CJ Delft, The Netherlands
Dirk J.E.M. Roekaerts
Department Process and Energy, Delft University of Technology, Leeghwaterstraat 44, 2628 CA Delft ; Department of Multi-Scale Physics, Delft University of Technology, Leeghwaterstraat 39, 2628 CB Delft
Jeroen Louwers
Research Group Rocket Technology, TNO Prins Maurits Laboratory, Lange Kleiweg 137, 2288 GJ Rijswijk, The Netherlands
G. M. H. J. L. Gadiot
Research Group Rocket Technology, TNO Prins Maurits Laboratory, Lange Kleiweg 137, 2288 GJ Rijswijk, The Netherlands

RÉSUMÉ

The planar laser induced fluorescence technique (PLIF) has been used to study the diffusion flame structure of propellants consisting of hydrazinium nitroformate (HNF) and glycidyl azide polymer (GAP). Goal of the experiment is to obtain more insight in the effect of the particle size distribution on the combustion properties of HNF/GAP propellants. OH and CN-distributions were measured at different pressures. In addition to neat HNF and HNF-propellants, HNF/GAP/HNF-sandwiches, which have a simple two-dimensional structure, were used for a more accurate determination of the interaction between the HNF flame and the GAP flame. The results are compared to CFD calculations. It was found that a diffusion flame was present but it is located higher above the surface than the monopropellant flame. At higher pressure the diffusion flame is smaller, but its height is almost independent of the pressure. The results imply that the burn rate of HNF/GAP-propellants will not depend on the particle size as is seen in AP-based propellants, where diffusion flames appear to be strong and close to the surface.