Investigation of jumping pulsed electrical discharge for plasma chemistry application
The behaviour of the pulsed discharge at atmospheric pressure between multiple needles- plane electrode has been investigated. This type of discharge has been used in our experiments as a suitable tool for plasma chemistry of COx, NOx and SOx, i.e. for effective decomposition of these radicals. The...
Saved in:
| Published in: | Вопросы атомной науки и техники |
|---|---|
| Date: | 2002 |
| Main Authors: | , , , , |
| Format: | Article |
| Language: | English |
| Published: |
Національний науковий центр «Харківський фізико-технічний інститут» НАН України
2002
|
| Subjects: | |
| Online Access: | https://nasplib.isofts.kiev.ua/handle/123456789/79280 |
| Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
| Journal Title: | Digital Library of Periodicals of National Academy of Sciences of Ukraine |
| Cite this: | Investigation of jumping pulsed electrical discharge for plasma chemistry application / G.P. Berezina, Ju.V. Bunchikov, V.I. Mirny, I.N. Onishchenko, V.S. Us // Вопросы атомной науки и техники. — 2002. — № 5. — С. 136-138. — Бібліогр.: 2 назв. — англ. |
Institution
Digital Library of Periodicals of National Academy of Sciences of Ukraine| _version_ | 1859988143666626560 |
|---|---|
| author | Berezina, G.P. Bunchikov, Ju.V. Mirny, V.I. Onishchenko, I.N. Us, V.S. |
| author_facet | Berezina, G.P. Bunchikov, Ju.V. Mirny, V.I. Onishchenko, I.N. Us, V.S. |
| citation_txt | Investigation of jumping pulsed electrical discharge for plasma chemistry application / G.P. Berezina, Ju.V. Bunchikov, V.I. Mirny, I.N. Onishchenko, V.S. Us // Вопросы атомной науки и техники. — 2002. — № 5. — С. 136-138. — Бібліогр.: 2 назв. — англ. |
| collection | DSpace DC |
| container_title | Вопросы атомной науки и техники |
| description | The behaviour of the pulsed discharge at atmospheric pressure between multiple needles- plane electrode has been investigated. This type of discharge has been used in our experiments as a suitable tool for plasma chemistry of COx, NOx and SOx, i.e. for effective decomposition of these radicals. The main advantage of it concludes to a phenomenon of spark jumping from one needle to another over whole volume of treated gas. The behaviour of the pulsed discharge of such type has been studied with use of the optical registration method of discharge for each needle.
|
| first_indexed | 2025-12-07T16:30:21Z |
| format | Article |
| fulltext |
INVESTIGATION OF JUMPING PULSED ELECTRICAL DISCHARGE
FOR PLASMA CHEMISTRY APPLICATION
G.P. Berezina, Ju.V. Bunchikov, V.I. Mirny, I.N. Onishchenko, V.S. Us
National Science Center “Kharkov Institute of Physics & Technology”,
Academicheskaya St. 1, Kharkov, 61108, Ukraine, E-mail: onish@kipt.kharkov.ua
The behaviour of the pulsed discharge at atmospheric pressure between multiple needles- plane electrode has
been investigated. This type of discharge has been used in our experiments as a suitable tool for plasma chemistry of
COx, NOx and SOx, i.e. for effective decomposition of these radicals. The main advantage of it concludes to a phe-
nomenon of spark jumping from one needle to another over whole volume of treated gas.
The behaviour of the pulsed discharge of such type has been studied with use of the optical registration method
of discharge for each needle.
PACS: 52.80.-s; 52.77.-j
1. INTRODUCTION
In our previous work [1] we have used so called multi-
spark “jumping” pulsed discharge (it is successively jumping
from one needle to another one) for COx, NOx, and SOx
plasma-chemistry. Among the variety of electrical discharges
this type of discharge is the effective one, as it can operate in
a large volume of gas at high-pressure gas up to atmospheric
one and above. Such discharge at most satisfies the condi-
tions of performance of non-equilibrium plasma-chemical
reactions.
The plasma-chemical reactions are being carried out with
a high efficiency of molecules decomposition when working
in a gas of high pressure. However at high pressures there are
no well-elaborated effective electric discharges. One of per-
spective types of the discharge working at atmospheric pres-
sure and above is the pulsed corona or pulsed spark [1,2].
The problem consists of how to treat the whole large
volume of gas by such discharges. With this purpose the ef-
forts are undertaken to force discharges to ran, jump, dance
or something like all over the gas volume.
The pulsed discharge providing the performance in gas
at high-pressure (atmospheric one and higher), allows in-
creasing the efficiency of plasma-chemical technological
processes. During a short time the optimum distribution
function over energies of plasma electrons that is necessary
for excitation of corresponding energy levels of electrons
responsible for production of effective chemical reactions
is shaped. The estimation of pulse length can be obtained
under consideration of self-consistent processes in the dis-
charge at the applied constant voltage or in RC - relaxation
scheme.
In the present work the spark pulsed discharge between
a set of needles and planar electrode is explored with the
purpose of finding - out of a dynamics of a spark succes-
sively jumping from one needle on another and determin-
ing the probability of functioning of each needle for variety
of parameters set.
Thus, in accordance with the formulated goal – to ob-
tain at most the amount of resultants of reaction in gases –
it is necessary to keep the followings:
-to use the repetitive mode of pulsed discharge provid-
ed that duty factor should provide the maximum products
obtaining;
-the type of chosen discharge should correspond the re-
quirements of its operation through all the interelectrode
space.
Hence the highest efficiency of process of harmful radi-
cals decomposition can be implemented in a multi-spark
pulsed discharge with a geometrical configuration of elec-
trodes like this: the expand system of needles - plane. This
type of the discharge was used in ours experiments as ap-
propriate one for plasma-chemistry of COx, NOx, and
SOx, that is for their effective decomposition.
The object of our presentation is the investigation of the
dynamics of the discharge between a set of needles and
plane that is used in experiments on plasma-chemistry.
2. THE EXPERIMENTAL
INSTALLATION
The experiments on COх, SOх dissociation and Noх
synthesis in electric discharge were carried out on instal-
lation shown in Fig. 1.
The hermetic chamber (CV), consisting of a glass
cylindrical balloon (3), enclosed from above by a flange
(6), and from below by a bottom (1), serves simultane-
ously as gas-discharge chamber and chemical reactor.
Along an axis of the chamber two isolated electrodes are
located: lower (4) and upper (5). The lower flat elec-
trode is manufactured from aluminum and has the shape
of a circle (diameter 3.8·10-2m).
The upper electrode sets on a flange (6) with an op-
portunity of moving along an axis of CV for regulation
of an inter-electrode gap. This electrode is changeable:
its shape and size depends on a type of the used dis-
charge. The electrode, movable along the axis, was a
stainless steel rod, 8·10-3 m in diameter, with a conical
end. This electrode was used to ignite the arc discharge.
For ignition of corona and spark discharge the similar
rod was used with an additional electrode (comb), i.e.
copper plate with the needles, manufactured from a cop-
per wire, soldered to it, and directed to the lower elec-
trode. The combs with 4, 5, 6 and 7 needles evenly dis-
tributed on its length (sizes of each needle manufac-
tured: a diameter 5·10-4 m, length 5·10-3 m. Length of the
comb is equal to a diameter of the lower electrode.
136 Problems of Atomic Science and Technology. 2002. № 5. Series: Plasma Physics (8). P. 136-138
mA
kVR1
R2U1=f(t)
C1
C2
P1 kVP2 0...25 kV PS
+
–
P3R5R4R3
S3S1
S2
C3
U2=f(I,t)
CV
NI1 PT
V3
V2
CG
T
PD
V7
PAS2
SR
NR
NI2
VF
1
2
3
4
5
6
7
9
8
S1
V5 V6
V4
V1
Fig. 1. Plasma chemical reactor:
CV - reactor chamber, CG - working gas chamber,
NI1 - vacuum mechanical pump NVZ-20, NI2 - vacuum
mechanical pump 2 NVR-5DM; NR - vacuum turbo
molecular pump VMN-500; S1 - spectrograph DFS-
452, S2 - mass-spectrometer MX7301, SR - two-coordi-
nate self-recorder N-306, PD - deformation vacuum
gauge; PA -ionization vacuum gauge, PT - thermal vac-
uum gauge; V1 ... V7 - straightway valves;
VF - metering valve; R1 ... R5 – resistors;
C1 ... C3 – capacitors; P1, P2 - kilovolt meters C96;
T - transformer (Rogowsky belt); 1 - reactor bottom,
2 - lower flange of the reactor chamber, 3 - glass case
of the chamber, 4 - lower electrode, 5 - upper electrode,
6 - upper flange of the chamber, 7 - insulator,
8 - quartz window, 9 - quartz lens
The electrodes of the discharge chamber are power
supplied via ballast resistors from the controlled dc source (
=0U 0 to 30 kV, =maxI 150 mA). The discharge cham-
ber design provided the conditions for igniting the dis-
charge of three types: corona and arc discharges with a
constant current, and the spark discharge at a pulsed mode
of operation.
The corona-discharge mode of operation is character-
ized by a high voltage applied to the discharge gap 0UU =
and a low current ≤I 1 mA. At the arc-discharge mode of
operation a considerable current ≥I 15 mA sets in at a
comparatively low voltage =U (0.1 to 0.3) 0U .
The spark-discharge mode of operation was realized in
the case when relaxation oscillations appeared in the elec-
trodes circuit and their power supply. These oscillations are
characterized by sharp changes in the rate of increase and
decrease in the voltage and current.
For translation of the scheme in a mode of the relax-
ation generator the condenser with capacity of C
=150...1000 pF was connected parallel to discharge gap.
The quantity of capacity at fixed value of resistance of a
ballast resistor determines the time of charging of the con-
denser up to a breakdown voltage of a discharge gap and,
hence, the repetitive frequency of a spark pulsed discharge.
Besides the repetitive frequency of discharge pulses de-
pends on an inter-electrode gap and voltage of the power
supply.
The pressure of working gas in the chamber of a reactor
(CV) can be changed and supported in a wide band of val-
ues (from several Torr to atmospheric pressure) with the
help of instrumentation of leakage and pumping.
For the check of an initial and final composition of gas
the mass-analyzer (S2) is mounted to the reactor. Registra-
tion of mass spectra is carried out by two-coordinate self
recorder (SR). The obtained mass spectra will be used for
calculation of the content a gas components.
The inter-electrode gap is chosen depending on applied
voltage in the limits (1,2…1,8)-2 m. The voltage of the
power supply is set from 15 up to 25 кV, the breakdown
voltage of the discharge gap under these conditions reaches
10…13 кV, resistance of the ballast (charging) resistor R
=2,5 МΩ. Repetitive frequency of discharge pulses f
=(0,3…1,2) kHz, pulse duration ≈10-6s, pulse current
≈80 A.
The spark discharge in each gap very often develops
not along the shortest trajectories between electrodes, but
various more longer trajectories, which are placed inside a
cone with vertex at an edge of a needle of the upper elec-
trode and basis on the lower electrode with a diameter of a
circle approximately equal to a half of value of the inter-
electrode gap. Because of continuous random displacement
of a spark in discharge gap a registered light radiation ap-
pears modulated on intensity.
The investigations of features of a spark discharge in air
at atmospheric pressure is carried out on the experimental
set up with use of plasma chemical reactor installation (Fig.
1), which construction was somewhat changed.
The experimental scheme is given in Fig. 2. For deriv-
ing the access to interelectrode gape the glass balloon was
taken off. On the upper electrode (1) the comb with 4
needles was set. The lower flat electrode is exchanged on
ridge one consisting of thin metal strips set under each
needle of the upper electrode (2). To lower an interference
level in measuring circuits from an pulsed discharge and to
avoid the danger of a defeat by an electrical current, the
non-contact method of study of spark behavior in inter-
electrode gape is applied.
Fig.2. Scheme of measurement. 1-upper electrode,
2-lower electrode, 3-power supply, 4- photo-receivers,
5-amplifiers unit, 6-analoge-digital converter, 7-com-
puter
137
From four discharge channels the light radiation ac-
companying each needle – strip discharge, is registered
by the help of 4 photo-detectors and transformed in elec-
trical signals. With the purpose of preventing lightening
from the discharges in the neighbor channels the receiv-
ing photodiodes set in tubes with anti-reflection of light
coating and small aperture angle. All photo-detectors are
joined in one screened box (4).
The signals relevant to the sequence of spark dis-
charges in each channel from photo-detectors through 4
channel amplifiers (5) enter on 4 channel analog-digital
converters (6). The arbitrary samples of these signals by
duration 0.1 and 0.2 sec with a period of digitization
3.2∙10-6∙ and 6.4 10-6 sec in a binary code are recorded in
a computer memory (7). Further the obtained by this
way data are computed with the help of corresponding
mathematical programs.
3. EXPERIMENTAL RESULTS
The light radiation as a sequence of short-term
flashouts from discharges in each of four discharge gaps
with the help of a photoreceiving device is transmuted
into four synchronous sequences of electrical impulses.
Converted with the help an analog-digital converter in a
binary code the arbitrary samples of a pulse sequence by
duration 0,1 or 0,2 sec are inlet in the computer and af-
ter handling of results are output as the diagram А=f (t),
where А – amplitude of an impulse, t – time.
In Fig. 3 and 4 two groups 4 synchronous pulse se-
quences from four discharge gaps obtained for two dif-
ferent instants are submitted.
Comparing pulse sequences in Fig.3, it is possible to
see, that in the first and second gaps the quantity of the
discharges during interval t = 0,1sec is more than in oth-
ers. Nevertheless, in other two gaps the discharges also
occur, but they are more rare. From Fig. 4 it is visible,
that in this interval of time the discharges arise more of-
ten from edges of needles in the first and third gaps. In
the others two gaps the discharges will not stop, though
their quantity is less. If to compare such sequences in
other time intervals, it is possible to mark, that the dis-
charge jumps from one needle to another, without con-
centration on any one chosen needle.
4. CONCLUSIONS
In present work carried out examination of features
of development of a pulsed spark discharge in air at at-
mospheric pressure in gap between an electrode as 4
needles and linear electrode. The applied noncontact
method of recording of the discharges in an interelec-
trode gap has allowed to register synchronous sequences
of electrical impulses relevant to light radiation from
each needle, and to compare them.
The obtained results testify that in a pulsed spark
discharge of such configuration all edges without exteri-
or interference operate practically with identical proba-
bility. In earlier our experiments at use of a great many
of needles, at any rate, visually character of the dis-
charge did not vary. Therefore, having extended ob-
tained results of the given work on multispark of sys-
tems of electrodes, it is possible to guess, that in such
configuration of electrodes there is an opportunity to re-
alization the discharge in large volumes, that represents
essential interest for plasmachemistry.
Fig.3. Sequence of discharge pulses in four channels
during 0.1 sec for the first instant
Fig.4. Sequence of discharge pulses in four chan-
nels during 0.1 sec for the second instant
REFERENCES
1. G.P.Berezina, I.N.Onishchenko, V.S.Us Pulsed Plas-
machemistry of COx,NOx,SOx // Prikladnaja Fizika,
2002, 2, s.34-44.
2. Satoshi Sugimoto, Shunji Norikane, Atsushi Takehara
and Seiichi Goto. Operating Characteristics of a Glou
Plasma Discharge at Atmospheric Pressure //
Proc.1996. Int. Conf. On Plasma Physics, Nagoya,
1996.
138
G.P. Berezina, Ju.V. Bunchikov, V.I. Mirny, I.N. Onishchenko, V.S. Us
Academicheskaya St. 1, Kharkov, 61108, Ukraine, E-mail: onish@kipt.kharkov.ua
|
| id | nasplib_isofts_kiev_ua-123456789-79280 |
| institution | Digital Library of Periodicals of National Academy of Sciences of Ukraine |
| issn | 1562-6016 |
| language | English |
| last_indexed | 2025-12-07T16:30:21Z |
| publishDate | 2002 |
| publisher | Національний науковий центр «Харківський фізико-технічний інститут» НАН України |
| record_format | dspace |
| spelling | Berezina, G.P. Bunchikov, Ju.V. Mirny, V.I. Onishchenko, I.N. Us, V.S. 2015-03-30T09:22:09Z 2015-03-30T09:22:09Z 2002 Investigation of jumping pulsed electrical discharge for plasma chemistry application / G.P. Berezina, Ju.V. Bunchikov, V.I. Mirny, I.N. Onishchenko, V.S. Us // Вопросы атомной науки и техники. — 2002. — № 5. — С. 136-138. — Бібліогр.: 2 назв. — англ. 1562-6016 PACS: 52.80.-s; 52.77.-j https://nasplib.isofts.kiev.ua/handle/123456789/79280 The behaviour of the pulsed discharge at atmospheric pressure between multiple needles- plane electrode has been investigated. This type of discharge has been used in our experiments as a suitable tool for plasma chemistry of COx, NOx and SOx, i.e. for effective decomposition of these radicals. The main advantage of it concludes to a phenomenon of spark jumping from one needle to another over whole volume of treated gas. The behaviour of the pulsed discharge of such type has been studied with use of the optical registration method of discharge for each needle. en Національний науковий центр «Харківський фізико-технічний інститут» НАН України Вопросы атомной науки и техники Low temperature plasma and plasma technologies Investigation of jumping pulsed electrical discharge for plasma chemistry application Article published earlier |
| spellingShingle | Investigation of jumping pulsed electrical discharge for plasma chemistry application Berezina, G.P. Bunchikov, Ju.V. Mirny, V.I. Onishchenko, I.N. Us, V.S. Low temperature plasma and plasma technologies |
| title | Investigation of jumping pulsed electrical discharge for plasma chemistry application |
| title_full | Investigation of jumping pulsed electrical discharge for plasma chemistry application |
| title_fullStr | Investigation of jumping pulsed electrical discharge for plasma chemistry application |
| title_full_unstemmed | Investigation of jumping pulsed electrical discharge for plasma chemistry application |
| title_short | Investigation of jumping pulsed electrical discharge for plasma chemistry application |
| title_sort | investigation of jumping pulsed electrical discharge for plasma chemistry application |
| topic | Low temperature plasma and plasma technologies |
| topic_facet | Low temperature plasma and plasma technologies |
| url | https://nasplib.isofts.kiev.ua/handle/123456789/79280 |
| work_keys_str_mv | AT berezinagp investigationofjumpingpulsedelectricaldischargeforplasmachemistryapplication AT bunchikovjuv investigationofjumpingpulsedelectricaldischargeforplasmachemistryapplication AT mirnyvi investigationofjumpingpulsedelectricaldischargeforplasmachemistryapplication AT onishchenkoin investigationofjumpingpulsedelectricaldischargeforplasmachemistryapplication AT usvs investigationofjumpingpulsedelectricaldischargeforplasmachemistryapplication |