Flame and surface structure of laminate propellants with coarse and fine ammonium perchlorate

R. P. Fitzgerald, P. Genevieve, M Quinn Brewster

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

The combustion of two-dimensional laminate propellants of ammonium perchlorate (AP) and hydroxyl-terminated polybutadiene (HTPB) is investigated experimentally and theoretically. The experiments use UV emission and transmission imaging to obtain simultaneous information about flame structure and burning surface profile for pressures ranging from 2 to 55 atm. The modeling uses numerical computations based on finite-rate chemistry with simplified kinetics and a free surface. Results show that flame-surface structure is a function of length scale (in this case, fuel-layer thickness), pressure, and equivalence-ratio disparity between the non-premixed fuel and oxidizer regions (binder-matrix equivalence ratio). Factors that promote split (diffusion) flamesurface structure are large length-scale, high pressure, and large equivalence-ratio disparity. The opposite factors (including oxygenating the binder) promote merged (premixed) flame-surface structure. For oxygenated binder loaded to the monomodal-AP limit (fine-AP/binder = 76:24) the transition thickness between split and merged structure is 5 to 10 times larger than that for pure binder. A correlation is shown between this transition and the optimal thickness that maximizes regression rate (at a given pressure). It has been determined both computationally and experimentally through the use of triple-layer laminates that the flame-surface structure at the center of the laminate is relatively uninfluenced by the outer boundary conditions. This provides firm justification for using the simpler, single fuel layer laminates to validate computational simulations through characterizing the effects of pressure, thickness, and binder equivalence ratio on flame and burning surface structure.

Original languageEnglish (US)
Title of host publication41st Aerospace Sciences Meeting and Exhibit
StatePublished - Dec 1 2003
Event41st Aerospace Sciences Meeting and Exhibit 2003 - Reno, NV, United States
Duration: Jan 6 2003Jan 9 2003

Publication series

Name41st Aerospace Sciences Meeting and Exhibit

Other

Other41st Aerospace Sciences Meeting and Exhibit 2003
CountryUnited States
CityReno, NV
Period1/6/031/9/03

Fingerprint

ammonium perchlorates
perchlorate
propellants
Propellants
Surface structure
laminates
Laminates
Binders
flames
ammonium
equivalence
polybutadiene
boundary condition
oxidizers
combustion
premixed flames
Polybutadienes
kinetics
matrix
propellant

ASJC Scopus subject areas

  • Space and Planetary Science
  • Aerospace Engineering

Cite this

Fitzgerald, R. P., Genevieve, P., & Brewster, M. Q. (2003). Flame and surface structure of laminate propellants with coarse and fine ammonium perchlorate. In 41st Aerospace Sciences Meeting and Exhibit (41st Aerospace Sciences Meeting and Exhibit).

Flame and surface structure of laminate propellants with coarse and fine ammonium perchlorate. / Fitzgerald, R. P.; Genevieve, P.; Brewster, M Quinn.

41st Aerospace Sciences Meeting and Exhibit. 2003. (41st Aerospace Sciences Meeting and Exhibit).

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Fitzgerald, RP, Genevieve, P & Brewster, MQ 2003, Flame and surface structure of laminate propellants with coarse and fine ammonium perchlorate. in 41st Aerospace Sciences Meeting and Exhibit. 41st Aerospace Sciences Meeting and Exhibit, 41st Aerospace Sciences Meeting and Exhibit 2003, Reno, NV, United States, 1/6/03.
Fitzgerald RP, Genevieve P, Brewster MQ. Flame and surface structure of laminate propellants with coarse and fine ammonium perchlorate. In 41st Aerospace Sciences Meeting and Exhibit. 2003. (41st Aerospace Sciences Meeting and Exhibit).
Fitzgerald, R. P. ; Genevieve, P. ; Brewster, M Quinn. / Flame and surface structure of laminate propellants with coarse and fine ammonium perchlorate. 41st Aerospace Sciences Meeting and Exhibit. 2003. (41st Aerospace Sciences Meeting and Exhibit).
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