Effects of Transverse Magnetic Field with Different Alternating Currents on Heat Flux Density Distributions of Plasma Arc
An external transverse-alternating magnetic field with sinusoidal and triangular alternating currents was applied to a combined plasma arc to create a plasma arc for expanding the cross section of arc column and flatting the distributions of arc temperature. Two mathematical models were developed to describe the heat flux density distributions of the combined plasma arc driven by a transverse-alternating magnetic field with sinusoidal and triangular alternating currents. The behavior of plasma arc under the external transverse-alternating magnetic field imposed perpendicular to the plasma current was discussed theoretically and experimentally by changing various parameters such as working gas flux, arc current, magnetic flux density including its wave form and the standoff from the nozzle to the workpiece. The analytical results show that it is feasible to adjust the shape and heat flux density of the combined plasma arc by the transverse- alternating magnetic field, which expands the region of combined plasma arc thermal treatment and uniforms the heat flux density upon the workpiece. Changing the waveform of the alternating current can also control the heat flux density distribution. As well as, calculated heat flux density distributions of combined plasma arc driven by the external transverse-alternating magnetic field show a good agreement with experimental data. The magnetic field with triangular alternating current can flat the heat flux density distribution on the anode rather than sinusoidal one. This approach to flat the heat flux density distribution on the anode surface will give an effective controllability to the combined plasma arc application.
Classical Mechanics: Applied Mechanics and Mechatronics
Preface.- List of Symbols.- 1. Dynamics in Mechatronic Systems.- 2. Equations of Motion of a Rigid Spherical Body.- 3. Theory of Gyroscopes.- 4. Dynamics and Control of a Gyroscope.- 5. Gyroscopic Control in Self-Guidance Systems of Flying Objects.
Plasma jets in the development of new materials technology : Proceedings of the international workshop, 3-9 September 1990, Frunze, USSR
The demands of industry for creating new functional materials with predetermined properties have stimulated an increasing interest in the investigation of processes occurring in plasma jets of complex chemical composition (homogeneous and heterogeneous) as well as their interaction with hard surfaces. This Proceedings volume contains contributions from leading international specialists on plasma science and technology which were presented at the 2nd International Workshop "Plasma Jets in the Development in of New Materials Technology", 3--9 September 1990, Frunze (USSR). The scope of the workshop incorporated the following aspects: -- modelling of the processes of momentum heat and mass transfer in homogeneous and heterogeneous plasma jets as well as interaction between the particles and the base; -- diagnostics of the parameters of gas and disperse phases in plasma flows; -- plasma-spraying processes investigations; -- processes of treatment and production of materials, including powder materials.