A5056109862- Vacuum and Plasma Arcs
- Welding Techniques and Residual Stresses
- Advanced Sensor Technologies Research
- Metal and Thin Film Mechanics
- Electrical Fault Detection and Protection
- Advancements in Materials Engineering
- Gas Dynamics and Kinetic Theory
- Advanced machining processes and optimization
- Lubricants and Their Additives
- Electrical Contact Performance and Analysis
- Metal Alloys Wear and Properties
- Particle Dynamics in Fluid Flows
- Diamond and Carbon-based Materials Research
- Hydrogen embrittlement and corrosion behaviors in metals
- Combustion and Detonation Processes
- Chemical Thermodynamics and Molecular Structure
Brno University of Technology
2004-2019
Mylan (Switzerland)
2019
nLIGHT (United States)
2018
The paper deals with near-electrode regions of electric arc burning in argon an heater. behavior is described by a mathematical model using the gas transport and thermodynamic properties real experimental data. obey different rules than intensively blasted column alone, but integral measured data include both them. For modelling arc, have been previously neglected or taken from other authors who investigated just phenomena. Now, influence near-electrodes tried to be excluded procedures based...
The paper deals with the description of intensively blasted electric arc burning in Ar anode channel heater operated under various conditions. Directly measured experimental data (current, voltage, gas flow rate, power loss) characterize operation device as a whole, but important parameters describing inside (its geometry, temperature and voltage distribution) must be revealed using mathematical model arc. An updated version is introduced used for analysis two exemplary sets data. results...
The paper deals with the power loss distribution along arc heater intensively blasted electric and compares measured of individual parts computed using a simple model arc. In previous works, authors have presented burning in channel. Measured integral quantities obtained during numerous experiments served as input data attention has been focused at finding development radius temperature heater's channel that meets experimentally values whole. this contribution, is divided into several whose...
The paper describes main steps of the design high-temperature device with working gas heated by electric arc. experimental modular-type has been designed and operated in various modifications authors. summarizes useful formulas for illustrates them some typical experimentally obtained dependencies.
The paper presents the results of numerous experiments carried out on a high temperature device consisting an arc heater with intensively blasted electric and reaction chambers connected to its output. influence nitrogen mass concentration (up 11 %) in working gas Ar+N2 voltage–current characteristics, power losses individual parts efficiency is studied for two variants electrical configuration device. A short description computation necessary thermodynamic transport properties mixture...
The contribution deals with a calculation of power irradiated from the intensively blasted electric arc burning in heater's anode channel. Previously discovered discrepancy between computed and measured loss individual parts channel has been motivation for searching more suitable way computing loss, instead older method based on constant ratio. Furthermore, prior research shown that radiation is highly prevailing mechanism transmitting column to wall. Thus, new procedure designed estimation...
The article deals with an improvement of a simplified model intensively blasted electric arc burning in argon anode channel modular-type heater. Gradually gained experience the application various input data has revealed that some refinement is needed. contribution focuses especially on process searching for optimum combination state variables, which are exponent determining radius development along axis, current density at cathode, and temperature end near-cathode layer. limiting relations...
The paper describes the results obtained from experimental operation of arc heater with intensively blasted electric arc. device has been designed for investigation decomposition stable harmful substances and later its construction modified to achieve steady low gas flow rates. modification consists in reduction anode channel diameter a solid cylinder inserted into input part channel. comments impact constructional on basic operational characteristics operated argon argon/hydrogen mixtures.
Results of measurements carried out on the fabricated experimental modular-type arc heater serve as input data for designed simplified model intensively blasted electric burning in argon inside cylindrical heater's anode channel. The axial dependence temperature and radius is expressed using exponent, current density cathode tip at end near-cathode boundary layer. These quantities form vector state variables that sought to minimize value objective function expressing deviations between...
In previous versions of the simplified model intensively blasted electric arc burning in argon heater's anode channel, authors used constant total power loss coefficient for estimation losses all channel individual parts. Using this approach, with relatively low computational complexity has led to very good agreement between computed and experimentally obtained values, but when measured segments have been compared, considerable differences revealed. modified model, theoretically net emission...
The influence of the fuel thermal conductivity
The designed mathematical model of the intensively blasted electric arc burning inside heater anode channel is based on energy and mass conservation laws Ohm's law. With aim decreasing computational burden making easy to understand for students, simplifying presumptions are included. Validity them could be impaired when applied with experimental data obtained under very different operational conditions. Thus, verification should made measured in a wide range gas flow rate, input power,...