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Investigation of wood combustion in the high-enthalpy oxidizer flow
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2017 J. Phys.: Conf. Ser. 789 012041
(http://iopscience.iop.org/1742-6596/789/1/012041)
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Investigation of wood combustion in the high-enthalpy
oxidizer flow
S M Reshetnikov, I A Zyryanov, A G Budin, A P Pozolotin
Department of Engineering Physics ,610000, Kirov, Moskowskaya Street, 36, Russia
E-mail: b185@mail.ru
Abstract. The experimental data of wood combustion in the high-enthalpy oxidizer
flowresearch is presented. Combustion laws of two wood species (pine and birch) in a hybrid
rocket engine (HRE) are obtained. Heat flows from the flame to the condensed phase surface
are defined. The prospects of the wood use in the HRE (based on thrust characteristics) are
shown.
Wood combustion research in a high-enthalpy flow is an important scientific and technical task.On
the one hand, the wood can be used as fuel in a hybrid rocket engines whose development are actively
conducted in recent years [1-2].On the other hand, investigation results are interesting to forecasting
and fire prevention systems developers [3].
Based on the above, the task of the work is wood combustion in high-enthalpy flow research.
The experimental setup is a stand with a hybrid rocket engine, described in detail in [4].As two
woodspecies birch and pine are selected.The wood sample is a cylinder with initialmass
0
m
, length of
0.2m and channel radius
0
r
= 0.01m.Before the testing started the samples are dried in an oven at a
temperature of 600 °C for 3 days until the moisture content of 6%. Samples moisture is determined by
electric hygrometers.Combustion is performed in the gaseous oxygen withstream density [10-40]
kg/m2s.The linear combustion rate is calculated according to the formula given in [5], thrust
measurement is madeby the load cell[4]. Heat flow calculation from the flame to the wood surface
produced by the method described in [6]. Carbon black investigation is produced on the microscopes
JEM-2100 and JSM-6510 LV.
Fig. 1 shows a graph of linear wood combustion rate against oxygen flux.
Figure 1.Dependence of linear wood and PMMA combustion rate against oxygen flux.
1
International Conference on Recent Trends in Physics 2016 (ICRTP2016) IOP Publishing
Journal of Physics: Conference Series 755 (2016) 011001 doi:10.1088/1742-6596/755/1/011001
Content from this work may be used under the terms of the Creative Commons Attribution 3.0 licence. Any further distribution
of this work must maintain attribution to the author(s) and the title of the work, journal citation and DOI.
Published under licence by IOP Publishing Ltd
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IOP Conf. Series: Journal of Physics: Conf. Series 789(2017) 012041 doi:10.1088/1742-6596/789/1/012041
According to Fig. 1, combustion laws are the following:
39.0
)(1.0
U
for birch
33.0
)(16.0
U
forpine
57.0
)(029.0
U
forPMMA
Combustion law for PMMA is in good agreement with the data presented in [7].The exponent in
the combustion law refers to combustion mode, in our case for wood it is a mixed mode (diffusion-
kinetic).
Fig. 2 shows a graph of thrust against oxygen flux.
Figure 2.Dependence of the thrust against oxygen flux density.
According to Fig. 2, the thrust of HREwith wood almost as good asthrust of HREwith
PMMA.This indicates the prospects of wood using as a propellant.
Fig. 3 shows agraph of the combustion rate against heat flux from the flame to the wood
surface.
Figure 3.Dependence of linear wood combustion rate against heat flux density.
The value of the heat flux density from the flame to the wood surface is in the range [180-360]
2
m
kW
(Fig. 3).However, combustibility tests carried out when the samples are exposed bythe heat
flux value to 50
2
m
kW
[3]. Such data may not be sufficient to predict the development of a forest fire
with a heat flow of about 200
2
m
kW
, given in [8].
The thickness of the carbon layer formed during wood combustion in the HRE lies within [200-
400] micrometers.In tests [3] carbon layer thickness reaches 5000 micrometers at the heat flux
density 50
2
m
kW
.
2
LTP2016 IOP Publishing
IOP Conf. Series: Journal of Physics: Conf. Series 789(2017) 012041 doi:10.1088/1742-6596/789/1/012041
Thus, a comprehensive study of wood combustion in high-enthalpy flow is conducted, resulting in:
1. Combustion laws for birch and pine wood is defined, combustion mode is diffusion-kinetic;
2. Thrust of HRE with wood compared to thrust of HRE with PMMA, prospects of using of wood as a
new type of fuel are shown;
3. It has been determined that the heat flux from the flame to the wood surface with the high-enthalpy
combustion value in 3-7 times higher than the indicator used for assessing the flammability in case of
fire.
4. It is shown that the thickness of the carbon layer after wood combustionin high-enthalpy flow is 12
times lower than thickness obtained by standard fire tests.
References
[1] Ivanov NN, Ivanov A N, The use of hybrid rocket engines in space vehicles, Journal of FGUP
NPO named afterLavochkin,2010, V.3, P. 50-55.
[2] Gubertov A M, Mironov V V, Gollender R G and others, The processes in hybrid rocket
engines, ed. ASKoroteeva,Moscow: Nauka, 2008, 405 P.
[3] AssevaR M, Serkov B B, Sivenkov A B, Wood combustion and its fire behavior, Moscow:
Academy of GPS MCHS Russia, 2010, 262 P.
[4] ReshetnikovS M, ZyryanovIA, PozolotinA P, BudinA G, Electrostatic field influence on the
combustion rate in hybrid rocket. Kazan, Vestnik of the Kazan State Technical University,
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[5] Hudson M K et al. Guanidiniumazo-tetrazolate (GAT) as a high performance hybrid rocket fuel
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[6] PozolotinAP, ReshetnikovS M, ZyryanovI A,BudinA G, ShaurkoP N, Methods of experimental
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(SPC-2016): Coll. materials, 2016.P. 1746-1751.
[7] Yuasa S, Yamamoto K, Hachiya H, Kitagawa K, Development of a Small Sounding Hybrid
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[8] ValendikE N, KosovIV, Thermal radiation of forest fires and its possible effects on the forest
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LTP2016 IOP Publishing
IOP Conf. Series: Journal of Physics: Conf. Series 789(2017) 012041 doi:10.1088/1742-6596/789/1/012041
