Intrinsic Burning Behavior and Flame Structure Diagnostics of Liquid Propellants
Abstract
From the combustion study of HAN-based liquid monopropellants, XM46 was found to exhibit unconventional characteristics with flashback behavior and negative pressure exponent. These characteristics are believed to be caused by the complex physical and chemical process occurring in condensed-phase region. The intrinsic burning rates of XM46 increased with pressure when P < 7 MPa, decreased for 7 < P <28 MPa, exhibited a hump-like shape when 28 < P <80 MPa, and increased again when P> 80 MPa. Luminous flame was observed only when P > 28 MPa. TEAN participates in the decomposition reactions of XM46 initiated in the liquid phase, producing dark-colored gaseous products (including NO2 and large carbon-containing species) at T^300 deg C. The major pyrolysis products of XM46 observed from a specially designed pyrolyzer were NO, N2O, N2, CO2, CO, H2O, HCN, and C2H4 for 130 <T < 540 deg C. Water evaporation appears to affect XM46 combustion, since the latent heat is about the same as the activation energies of HAN and TEAN and the heat release in the decomposition zone. The fuel ingredient in HAN-based propellant has a significant effect on burning characteristics, as demonstrated by the replacement of TEAN with glycine.
Document Details
- Document Type
- Technical Report
- Publication Date
- Jul 31, 2000
- Accession Number
- ADA384293
Entities
People
- E. Boyer
- K. K. Kuo
- Y. P. Chang
Organizations
- Pennsylvania State University