Abstract
Two-dimensional laminate propellant flames of ammonium Perchlorate (AP) and hydroxyl-terminated polybutadiene (HTPB) have been observed using infrared (IR) and ultraviolet (UV) emission and transmission imaging. Under fuel-lean conditions and at slightly elevated pressures (4 atm), intrinsic instability has been observed in the form of a leading-edge flame kernel whose location oscillates laterally about the central fuel binder layer. A mechanistic explanation for this behavior is described in terms of local gas-phase equivalence ratio, surface geometry, and gas-solid thermal coupling. The flame structure under these conditions is unique in having a leading-edge flame kernel that appears to be more spatially distinct from the trailing diffusion flame than under nonoscillatory conditions. Other results are reported, including gas-phase rotational and vibrational temperature estimates based on HCl emission imaging spectroscopy. These results add to a growing set of flame and burning surface observations being assembled for the purpose of comprehensive validation of multi-dimensional AP composite propellant computational combustion models.
Original language | English (US) |
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Pages (from-to) | 2071-2078 |
Number of pages | 8 |
Journal | Proceedings of the Combustion Institute |
Volume | 31 II |
Issue number | 2 |
DOIs | |
State | Published - Jan 1 2007 |
Event | 31st International Symposium on Combustion - Heidelberg, Germany Duration: Aug 5 2006 → Aug 11 2006 |
Keywords
- Diffusion flames
- Flame instability
- Heterogeneous propellants
- IR spectroscopy
ASJC Scopus subject areas
- Chemical Engineering(all)
- Mechanical Engineering
- Physical and Theoretical Chemistry