@PhDThesis{Gouvêa:2017:EsQuPo,
author = "Gouv{\^e}a, Leonardo Henrique",
title = "Estudo da queima de polietileno e de combust{\'{\i}}veis {\`a}
base de parafina com solu{\c{c}}{\~o}es de per{\'o}xido de
hidrog{\^e}nio",
school = "Instituto Nacional de Pesquisas Espaciais (INPE)",
year = "2017",
address = "S{\~a}o Jos{\'e} dos Campos",
month = "2016-11-16",
keywords = "propuls{\~a}o h{\'{\i}}brida, per{\'o}xido de hidrog{\^e}nio,
polietileno, parafina, taxa de regress{\~a}o, hybrid propulsion,
hydrogen peroxide, polyethylene, paraffin fuel, regression rate.",
abstract = "Sistemas de propuls{\~a}o h{\'{\i}}brida apresentam maior
seguran{\c{c}}a de opera{\c{c}}{\~a}o, menor complexidade de
projeto e menores custos de desenvolvimento e de
opera{\c{c}}{\~a}o que sistemas a bipropelentes
l{\'{\i}}quidos. Uma das limita{\c{c}}{\~o}es dos sistemas de
propuls{\~a}o h{\'{\i}}brida s{\~a}o os reduzidos empuxos
decorrentes das baixas taxas de regress{\~a}o dos propelentes
polim{\'e}ricos convencionais. O polietileno (PE) {\'e} um
combust{\'{\i}}vel h{\'{\i}}brido convencional que apresenta a
forma{\c{c}}{\~a}o de uma camada l{\'{\i}}quida de alta
viscosidade durante a queima e apresenta taxas de regress{\~a}o
superiores {\`a}s do polibutadieno hidroxilado (HTPB) e do
polimetil-metacrilato (PMMA). As taxas de regress{\~a}o de
propelentes {\`a} base de parafina s{\~a}o de 3 a 5 vezes
maiores que as taxas de regress{\~a}o do polietileno, uma vez que
se forma uma camada l{\'{\i}}quida de baixa viscosidade na
superf{\'{\i}}cie do gr{\~a}o, gerando gotas que s{\~a}o
misturadas ao fluxo de oxidante. O per{\'o}xido de
hidrog{\^e}nio {\'e} um green propellant com alta densidade que
se decomp{\~o}e acima de 800 \$^{o}\$C em
concentra{\c{c}}{\~o}es maiores que 90 \% m/m em
solu{\c{c}}{\~a}o aquosa. Uma c{\^a}mara de combust{\~a}o com
janela de quartzo foi projetada e constru{\'{\i}}da para o
estudo da queima de combust{\'{\i}}veis polim{\'e}ricos com
per{\'o}xido de hidrog{\^e}nio em concentra{\c{c}}{\~o}es de
85 e 90 \%. Um leito catal{\'{\i}}tico de {\'o}xidos de Co, Mn
e Al foi utilizado para decomposi{\c{c}}{\~a}o do per{\'o}xido
e inje{\c{c}}{\~a}o dos produtos da decomposi{\c{c}}{\~a}o na
c{\^a}mara de combust{\~a}o. Gr{\~a}os de se{\c{c}}{\~a}o
retangular de polietileno e de combust{\'{\i}}veis {\`a} base
de parafina foram preparados e queimados para an{\'a}lise da
varia{\c{c}}{\~a}o espacial e temporal da taxa de
regress{\~a}o. Observou-se a forma{\c{c}}{\~a}o de uma pequena
eleva{\c{c}}{\~a}o na entrada da porta dos gr{\~a}os de
polietileno, gerando uma zona de recircula{\c{c}}{\~a}o
adjacente. Combust{\'{\i}}veis {\`a} base de parafina foram
queimados com diferentes aditivos, verificando-se que a parafina
impregnada com fios de algod{\~a}o apresenta o melhor desempenho
em termos de igni{\c{c}}{\~a}o e estabilidade de queima.
ABSTRACT: Hybrid propulsion systems have higher security
operation, less complex design and lower operational and
developmental costs than liquid bipropellant systems. One of the
limitations of hybrid propulsion systems are the reduced thrust
levels resulting from the low regression rates of common polymeric
propellants. Polyethylene (PE) is a conventional hybrid fuel which
presents the formation of a liquid layer of high viscosity during
firing and shows regression rates higher than hydroxyl-terminated
polybutadiene (HTPB) and polymethyl methacrylate (PMMA).
Regression rates of paraffin-based propellants are 3 to 5 times
higher than polyethylene regression rates, since paraffin forms a
low viscosity liquid layer on the surface of the grain generating
droplets that entrain the oxidant flow. Hydrogen peroxide is a
high-density green propellant which decomposes above 800
\$^{o}\$C for concentrations in aqueous solutions higher than
90\% w/w. A combustion chamber with a quartz window was designed
and built for the study of polymeric fuels burning with hydrogen
peroxide in concentrations of 85 and 90 \%. A catalytic bed of
Co, Mn and Al oxides were used for decomposition of the peroxide
and injection of decomposition products into the combustion
chamber. Rectangular grains of polyethylene and paraffin-based
fuels were prepared and burned for analysis of the spatial and
temporal variation of the regression rate. There was the formation
of a lump at the port entrance of the polyethylene grains,
creating an adjacent recirculation zone. Paraffin-based fuels were
burned with different additives, and the impregnated paraffin wax
with cotton threads showed the best performance in terms of
ignition and burning stability.",
committee = "Costa, Fernando de Souza (presidente/orientador) and Marques,
Rodrigo Intini and Nunes, Renato Felix and Martins, Cristiane
Aparecida and Veras, Carlos Alberto Gurgel",
copyholder = "SID/SCD",
englishtitle = "Study of burning polyethylene and paraffin based fuels with
hydrogen peroxide solutions",
language = "pt",
pages = "190",
ibi = "8JMKD3MGP3W34P/3MPKMQP",
url = "http://urlib.net/ibi/8JMKD3MGP3W34P/3MPKMQP",
targetfile = "publicacao.pdf",
urlaccessdate = "27 abr. 2024"
}