A three phase rotating field microwave plasma design for a low-flow helium plasma generation

2010 ◽  
Vol 25 (1) ◽  
pp. 44-47 ◽  
Author(s):  
Krzysztof Jankowski ◽  
Andrzej P. Ramsza ◽  
Edward Reszke ◽  
Michał Strzelec
Keyword(s):  
Microwave Plasma ◽  
Low Flow ◽  
Helium Plasma ◽  
Plasma Generation ◽  
Three Phase ◽  
Rotating Field

scholarly journals Microwave Discharges in Liquid Hydrocarbons: Physical and Chemical Characterization

Polymers ◽  
2021 ◽  
Vol 13 (11) ◽  
pp. 1678
Author(s):  
Yuri A. Lebedev
Keyword(s):  
Microwave Plasma ◽  
Chemical Characterization ◽  
Liquid Hydrocarbons ◽  
Plasma Generation ◽  
2D Simulation ◽  
Dielectric Liquids ◽  
Physical And Chemical Characterization ◽  
Gas Products ◽  
Physical And Chemical ◽  
Microwave Discharges

Microwave discharges in dielectric liquids are a relatively new area of plasma physics and plasma application. This review cumulates results on microwave discharges in wide classes of liquid hydrocarbons (alkanes, cyclic and aromatic hydrocarbons). Methods of microwave plasma generation, composition of gas products and characteristics of solid carbonaceous products are described. Physical and chemical characteristics of discharge are analyzed on the basis of plasma diagnostics and 0D, 1D and 2D simulation.

Three-Phase and Five-Phase Motor Windings Common Point Potential Ripple with Respect to the Converter Zero Termina

Vestnik MEI ◽  
2021 ◽  
Vol 2 (2) ◽  
pp. 51-59
Author(s):  
Vladimir M. Tereshkin ◽  
◽  
Irshat L. Aitov ◽  
Dmitriy A. Grishin ◽  
Vyacheslav V. Tereshkin ◽  
...  
Keyword(s):  
Amplitude Modulation ◽  
Zero Point ◽  
Space Time ◽  
Common Point ◽  
Point Potential ◽  
Voltage Vector ◽  
Three Phase ◽  
Ripple Amplitude ◽  
The Common ◽  
Rotating Field

The aim of the study is to determine the parameters characterizing the ripple of a motor's three- and five-phase windings common point potentials (for the star winding connection diagram) with respect to the converter zero point. One of the reserves for decreasing electromagnetically induced vibration of an electric motor with a rotating field is to increase the number of working winding phases. The study subject is a five-phase motor winding connected to a bridge converter, namely, its ability to reduce electromagnetically induced vibration in comparison with that in using a three-phase winding. The common point potential ripple parameters are studied, and an approach is proposed to estimating the amplitude modulation of the space-time voltage vector of three- and five-phase windings under the influence of the common point potential ripple with respect to the converter zero point. Theoretical studies were carried out using the Fourier series expansion method and vector analysis methods. To confirm the theoretical results, experimental studies of the prototypes of three-phase and five-phase synchronous motors with inductors made on the basis of permanent magnets were carried out. The main results have shown the following. With increasing the number of phases of the rotating field motor working winding connected to a bridge converter, the common point potential ripple amplitude with respect to the converter zero point decreases, and the ripple frequency increases. The product of ripple amplitude by frequency remains unchanged. It is assumed that the common point potential ripple of the motor multiphase winding with respect to the converter zero terminal results in the amplitude modulation of the space-time voltage vector. With increasing the number of winding phases, the modulation amplitude decreases, and the modulation frequency increases. A five-phase motor has a lower level of the working winding common point potential ripple with respect to the converter zero point in comparison with a three-phase motor. Thus, it can be assumed that there will be a lower level of electromagnetically induced vibration in using a simple converter operation algorithm. The obtained results can be used in designing electric traction systems with vector control on the basis of multiphase motors. With increasing the number of phases, the common point potential ripple amplitude in a multiphase winding with respect to the converter zero point decreases, and the ripple frequency increases. Thus, the common point potential ripple amplitude in a five-phase winding is 5/3 times less than that in a three-phase winding, and the ripple frequency increases by 5/3 times, respectively. With increasing the number of working winding phases, the amplitude modulation of the resulting space-time voltage vector decreases. This circumstance has a positive effect on decreasing the electromagnetically induced vibration.

scholarly journals Volumetric Near-Field Microwave Plasma Generation

2003 ◽  
Author(s):  
R Exton ◽  
R Balla ◽  
G Herring ◽  
Svetozar Popovic ◽  
Leposava Vuskovic
Keyword(s):  
Microwave Plasma ◽  
Near Field ◽  
Plasma Generation

Microwave plasma generation of arsine from hydrogen and solid arsenic

1990 ◽  
Vol 57 (24) ◽  
pp. 2543-2545 ◽  
Author(s):  
Thomas R. Omstead ◽  
Ananth V. Annapragada ◽  
Klavs F. Jensen
Keyword(s):  
Microwave Plasma ◽  
Plasma Generation

scholarly journals Plasma Generating—Chemical Looping Catalyst Synthesis by Microwave Plasma Shock for Nitrogen Fixation from Air and Hydrogen Production from Water for Agriculture and Energy Technologies in Global Warming Prevention

Catalysts ◽  
2020 ◽  
Vol 10 (2) ◽  
pp. 152 ◽  
Author(s):  
Akay
Keyword(s):  
Microwave Irradiation ◽  
Microwave Plasma ◽  
Electrical Potential ◽  
Supported Catalyst ◽  
Molar Ratio ◽  
Chemical Looping ◽  
Spinel Type ◽  
Simultaneous Generation ◽  
Porous Catalyst ◽  
Plasma Generation

Simultaneous generation of plasma by microwave irradiation of perovskite or the spinel type of silica supported porous catalyst oxides and their reduction by nitrogen in the presence of oxygen is demonstrated. As a result of plasma generation in air, NOx generation is accompanied by the development of highly heterogeneous regions in terms of chemical and morphological variations within the catalyst. Regions of almost completely reduced catalyst are dispersed within the catalyst oxide, across micron-scale domains. The quantification of the catalyst heterogeneity and evaluation of catalyst structure are studied using Scanning Electron Microscopy, Energy Dispersive X-ray Spectroscopy and XRD. Plasma generating supported spinel catalysts are synthesized using the technique developed by the author (Catalysts; 2016; 6; 80) and BaTiO3 is used to exemplify perovskites. Silica supported catalyst systems are represented as M/Si = X (single catalysts) or as M(1)/M(2)/Si = X/Y/Z (binary catalysts) where M; M(1) M(2) = Cr; Mn; Fe; Co; Cu and X, Y, Z are the molar ratio of the catalysts and SiO2 support. Composite porous catalysts are synthesized using a mixture of Co and BaTiO3. In all the catalysts, structural heterogeneity manifests itself through defects, phase separation and increased porosity resulting in the creation of the high activity sites. The chemical heterogeneity results in reduced and oxidized domains and in very large changes in catalyst/support ratio. High electrical potential activity within BaTiO3 particles is observed through the formation of electrical treeing. Plasma generation starts as soon as the supported catalyst is synthesized. Two conditions for plasma generation are observed: Metal/Silica molar ratio should be > 1/2 and the resulting oxide should be spinel type; represented as MaOb (a = 3; b = 4 for single catalyst). Composite catalysts are represented as {M/Si = X}/BaTiO3 and obtained from the catalyst/silica precursor fluid with BaTiO3 particles which undergo fragmentation during microwave irradiation. Further irradiation causes plasma generation, NOx formation and lattice oxygen depletion. Partially reduced spinels are represented as MaOb–c. These reactions occur through a chemical looping process in micron-scale domains on the porous catalyst surface. Therefore; it is possible to scale-up this process to obtain NOx from MaOb for nitric acid production and H2 generation from MaOb–c by catalyst re-oxidized by water. Re-oxidation by CO2 delivers CO as fuel. These findings explain the mechanism of conversion of combustion gases (CO2 + N2) to CO and NOx via a chemical looping process. Mechanism of catalyst generation is proposed and the resulting structural inhomogeneity is characterized. Plasma generating catalysts also represent a new form of Radar Absorbing Material (RAM) for stealth and protection from radiation in which electromagnetic energy is dissipated by plasma generation and catalytic reactions. These catalytic RAMs can be expected to be more efficient in frequency independent microwave absorption.

Combustion of aluminum powder with steam entrained in a helium plasma using a 2.45 GHz microwave plasma torch

2020 ◽  
Vol 53 (18) ◽  
pp. 185204
Author(s):  
J E Palomino ◽  
S G Bilén ◽  
T Cawley ◽  
B Ludwig ◽  
S D Knecht
Keyword(s):  
Aluminum Powder ◽  
Plasma Torch ◽  
Microwave Plasma ◽  
Helium Plasma ◽  
Microwave Plasma Torch

Microwave plasma generation and filtered transport of O2(a 1Δg)

2009 ◽  
Vol 18 (3) ◽  
pp. 035014 ◽  
Author(s):  
Skip Williams ◽  
Svetozar Popovic ◽  
Manish Gupta
Keyword(s):  
Microwave Plasma ◽  
Plasma Generation

Long Line-Shaped Microwave Plasma Generation Employing a Narrow Rectangular Waveguide

2005 ◽  
Vol 44 (4A) ◽  
pp. 1945-1950 ◽  
Author(s):  
Takayuki Fukasawa ◽  
Syuitsu Fujii ◽  
Haruo Shindo
Keyword(s):  
Rectangular Waveguide ◽  
Microwave Plasma ◽  
Plasma Generation ◽  
Long Line

Characterization of Near-Infrared Nonmetal Atomic Emission from an Atmospheric Helium Microwave-Induced Plasma Using a Fourier Transform Spectrophotometer

1986 ◽  
Vol 40 (6) ◽  
pp. 759-766 ◽  
Author(s):  
Joseph Hubert ◽  
Huu Van Tra ◽  
Khanh Chi Tran ◽  
Frederick L. Baudais
Keyword(s):  
Fourier Transform ◽  
Near Infrared ◽  
Microwave Plasma ◽  
Emission Spectra ◽  
Plasma Source ◽  
Atomic Emission ◽  
Infrared Region ◽  
Emission Lines ◽  
Helium Plasma ◽  
Microwave Induced Plasma

A new approach for using Fourier transform spectroscopy (FTS) for the detection of atomic emission from an atmospheric helium plasma has been developed and the results obtained are described. Among the different types of plasma source available, the atmospheric pressure microwave helium plasma appears to be an efficient excitation source for the determination of nonmetal species. The more complete microwave plasma emission spectra of Cl, Br, I, S, O, P, C, N, and He in the near-infrared region were obtained and their corrected relative emission intensities are reported. This makes qualitative identification simple, and aids in the quantitative analysis of atomic species. The accuracy of the emission wavelengths obtained with the Fourier transform spectrophotometer was excellent and the resolution provided by the FTS allowed certain adjacent emission lines to be resolved. These atomic emission lines were found to be adequate for analytical applications.

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