Electrostatic field influence on wood combustion in high-enthalpy flow

Abstract

Experimental data of the wood combustion in a high-enthalpy flow in the presence of an electrostatic field with a potential difference of 5 kV research are given. Considering the field effect combustion laws are obtained for birch, used as a solid fuel component in a hybrid rocket engine.

Full text

Journal of Physics: Conference Series
PAPER • OPEN ACCESS
Electrostatic field influence on wood combustion in high-enthalpy flow
To cite this article: I A Zyryanov et al 2018 J. Phys.: Conf. Ser. 1058 012028
View the article online for updates and enhancements.
This content was downloaded from IP address 181.215.76.73 on 01/08/2018 at 02:20

1
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
1234567890 ‘’“”
LTP Coatings 2018 IOP Publishing
IOP Conf. Series: Journal of Physics: Conf. Series 1058 (2018) 012028 doi :10.1088/1742-6596/1058/1/012028
Electrostatic field influence on wood combustion in high-
enthalpy flow
I A Zyryanov1, A P Pozolotin1, A G Budin1
1 Vyatka State University, Department of Engineering Physics , 610000, Kirov,
Moskowskaya Street, 36, Russia
firewcross@mail.ru
Abstract. Experimental data of the wood combustion in a high-enthalpy flow in the presence
of an electrostatic field with a potential difference of 5 kV research are given. Considering the
field effect combustion laws are obtained for birch, used as a solid fuel component in a hybrid
rocket engine.
1. Introduction
The study of the electric fields influence on the hydrocarbon fuels combustion is an important
scientific and technical task. The result of the task is creating a contactless management tool for
combustion control process. The literature contains a great number of the kinetic and diffusion
combustion in electric fields studies. The electrostatic field can deform the combustion front, effect on
the phase transformations mechanism, and change the flame temperature [1-5]. The electric field
method of combustion control can be used in real power installations, including installations using
high-enthalpy flows [6-7].
Wood is a renewable hydrocarbon fuel, and the prospects for its use have not been fully explored. One
of the research areas is the high-enthalpy combustion study [8]. This kind of combustion realized in
the combustion chamber of hybrid rocket engines [9], in conditions of fires spreading [10].
Therefore, the task of the work is studying of the wood combustion process in a high-enthalpy flow in
the presence of an electrostatic field.
2. Experiment Procedure
The experimental setup is an installation with a hybrid rocket engine, described in detail in [7]. As
wood, birch with a moisture content of 6% is used. A sample of wood is a cylinder of mass m0, length
= 0.2 m and a channel with a radius of 0.01 m. The combustion is carried out in gaseous oxygen with a
flow density [10-40] kg/m2s. The linear combustion rate is calculated by the method given in [11].
Thrust measurement produced by the load cell [7]. The constant electrostatic field in the combustion
zone creating system is organized according to [12], the potential difference between electrodes is 5
kV. The heat flux from the flame to the surface of the wood calculation is carried out according to the
procedure described in [13].

2
1234567890 ‘’“”
LTP Coatings 2018 IOP Publishing
IOP Conf. Series: Journal of Physics: Conf. Series 1058 (2018) 012028 doi :10.1088/1742-6596/1058/1/012028
3. Experimental Results
Figure 1. Wood linear combustion rate vs oxygen flow density in the presence of an
electrostatic field.
The dependence of the birch linear combustion rate vs oxygen flow density in the presence of an
electrostatic field is shown in Fig. 1. The combustion laws have the following forms:
39.0
)(1.0

U
(Birch 0 kV)
38.0
)(12.0

U
(Birch 5 kV)
The exponent in the combustion law indicates a combustion mode: in our case for wood it is mixed
(diffusion-kinetic). According to the equations obtained, the electrostatic field does not change the
combustion mode. The linear combustion rate is increased by 20% with a potential difference of 5 kV.
Graph of the time-averaged thrust vs the oxygen flow density in the presence of an electrostatic field is
presented in Fig. 2.
Figure 2. Thrust vs the oxygen flow density.
According to Fig. 2, the thrust in the electrostatic field with a potential difference of 5 kV increases by
40%.
The electrostatic field influence mechanism on the fuels with a condensed phase combustion depends
on many factors [2, 3, 7]. It was found that during polymers combustion in the presence of an
electrostatic field, the flame temperature increases by an average of 100 K [3], combustion can be
accompanied by condensed phase dispersing [3], in the high-enthalpy combustion conditions the
polymer gasification centers number in the reaction layer increases [7]. In addition, the flame can
change its shape under the action of field mass forces, which leads to a change in the heat flux to the
condensed phase [2, 3]. All these factors contribute to the changes in the combustion rate.
According to experimental studies [14], wood combustion rate depends on the density of the heat flux
from the flame to the condensed phase.

3
1234567890 ‘’“”
LTP Coatings 2018 IOP Publishing
IOP Conf. Series: Journal of Physics: Conf. Series 1058 (2018) 012028 doi :10.1088/1742-6596/1058/1/012028
Figure 3. Density of the heat flux from the flame to the wood condensed phase vs the oxygen
flow density.
The plot of the heat flux density versus the oxidant flow density is shown in Fig. 3. As can be seen
from the graph, the electrostatic field leads to the heat flux increase by 20% according to the
calculation technique given in [13]. The reasons for this change in case of wood require further study.
4. Conclusion
Thus, experimental data of the wood combustion in a high-enthalpy flow in the presence of an
electrostatic field research are given. It is shown that the electrostatic field increases the wood
combustion rate by 20%, which leads to a change in the combustion law and in the hybrid rocket
engine thrust by 40%.
References
[1] Kidin N I, External electromagnetic fields influence on combustion processes,
http://www.ism.ac.ni/sgv/rtf/l21.rt.
[2] Reshetnikov S M, Zyryanov I A, The electrostatic field influence on the combustion
macrokinetic of alkanes and kerosene. Kazan, Vestnik of the Kazan State Technical
University, 2011, V.1, P. 120-128.
[3] Reshetnikov S M, Zyryanov I A, Pozolotin A P, Features of polymers combustion in the
electrostatic field. Taganrog, Southern Federal University Messenger. Technical Science,
2013, V.8, P. 30-36.
[4] Lauton D, 1976, Electrical aspects of combustion, ed V A Popov (Moscow: Energy) p 296.
[5] Tretyakov P K, Tupikin A V, Zudov V N, Effect of laser radiation and electric field on
combustion of hydrocarbon-air mixtures. Combustion, Explosion, and Shock Waves, 2009,
V.45, №4, P. 413-420.
[6] Afanasev V V, Kidin N I, 2008, Diagnosis and management of combustion stability in power
plants combustion chambers, (Moscow: Physmathlit) p 176.
[7] Reshetnikov S M, Zyryanov I A, Pozolotin A P, Budin A G, Electrostatic field influence on the
combustion rate in hybrid rocket. Kazan, Vestnik of the Kazan State Technical University,
2015, V.71, P. 52-57.
[8] Reshetnikov S M, Zyryanov I A, Budin A G, Pozolotin A P, Investigation of wood combustion
in the high-enthalpy oxidizer flow, Journal of Physics: Conference Series. – IOP Publishing,
2017, V.789, №1.
[9] Gubertov A M, Mironov V V, Gollender R G, 2008, The processes in hybrid rocket engines, ed.
A S Koroteeva, (Moscow: Nauka), p 405.
[10] Valendik E N, Kosov I V, Thermal radiation of forest fires and its possible effects on the forest
stand, Coniferous boreal zone, 2008, V.25, № 1-2, P. 88-92.

4
1234567890 ‘’“”
LTP Coatings 2018 IOP Publishing
IOP Conf. Series: Journal of Physics: Conf. Series 1058 (2018) 012028 doi :10.1088/1742-6596/1058/1/012028
[11] Hudson M K et al. Guanidinium azo-tetrazolate (GAT) as a high performance hybrid rocket fuel
additive, J. Pyrotechnics, 2004. V.19, P. 37-42.
[12] Reshetnikov S M, Zyryanov I A, Budin A G, Pozolotin A P, Patent for invention RU2598984,
Hybrid rocket engine thrust increase method, applicant and patent holder Vyatka State
University - No. 2015100924, publ. 10.10.2016, Bul. № 28, p 6.
[13] Pozolotin A P, Reshetnikov S M, Zyryanov I A, Budin A G, Shaurko P N, Methods of
experimental study of wood combustion in a high-enthalpy flow, Kirov, Society, science,
innovation (SPC-2016): Coll. materials, 2016. P. 1746-1751.
[14] Abduragimov I M, Androsov A S, Batrak M, Ignition and combustion of wood under the
influence of heat fluxes, FGV, 1986, V.22, №1, P. 10-15.