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Tuesday, June 03, 2008, Auditorium 2 4:10 PM Junior Session This session will deal with different topics, most promising young talents, both from industry and universities will report shortly about their work. This session is accompanied by a special poster exposition. All visitors of this session are allowed to elect their favorite contribution, the winner will be anounced on the awards banquet |
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Numerical simulation of an electromagnetically controlled plasma jet during atmospheric plasma spraying |
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Eva Brußies* / Institute for Aerospace Engineering, Technische Universität Dresden, Germany Jörg Stiller / Institute for Aerospace Engineering, Technische Universität Dresden, Germany Roger Grundmann/ Institute for Aerospace Engineering, Technische Universität Dresden, Germany |
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Numerical simulation of atmospheric plasma spraying is of growing interest for the investigation of basic process properties and process improvements. Using CFD models one can simulate different aspects of the process - beginning with the plasma generation within the electric arc column to the plasma jet flow. Our intention is to improve the process by controlling the plasma jet. Thereby it is possible to heat (thermal control) or accelerate (kinematic control) the plasma jet or to damp jet fluctuations. The electric conductivity of the plasma gives a starting point to use external magnetic fields for an electromagnetic control, where e.g. DC, rotating or travelling magnetic fields can be used. A generic model of the plasma gun including a coil system at the end of the nozzle for different field generation is used for the numerical simulation. We are going to present the results of an investigation of the effects of a travelling magnetic field (TMF) on the plasma flow using a commercial program package. The argon plasma generation in the electric arc and the Lorentz force induced by the TMF are simulated with different equations, which are derived from the magnetofluiddynamic equations using appropriate simplifications. First calculations confirm the by analytical estimations predicted acceleration. Further calculations are used to investigate the systematic (kinematic and thermal) control of the plasma jet using external magnetic fields. |