Multi-sensing Control of Plasma Flow Systems Utilizing Super Functionalization

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The experimental and theoretical studies were carried out to establish a multi-sensing control systems for functional plasma flow by utilizing the applied magnetic effect and by seeding vaporized metal and reactive gas and further by injecting fine particles. The main results obtained here are as follows:(1) A multi-sensing control system for plasma jet stabilization was successfully established by controling the radiation intensity and by operating magnetic flux density. The constant value control performance of radiation intensity for sudden flow rate variation and further the control performance of plasma jet dynamic behavior for oscillating inlet flow rate were clarified experimentally.(2) The effects of applied frequency and seeding ratio of potassium on thermofluid field of inductivley coupled plasma and phase change of various kinds of metal powders injected were clarified by numerical simulation.(3) 3D multiphase plasma jet with carrier gas, particles and water droplet in dense loading were numerically analyzed by taking loading effect, phase change, variation of thermophysical properties, compressible effect and complex configuration into account.(4) Computational simulation for plasma spraying process, arc ash melting process and arc-electrodes system were conducted by developing strongly realistic model. The optimal operating conditions and plasma gun geometry were obtained to increase process efficiency and to extend life time.(5) DC-RF hybrid plasma systems were developed by super functionalization. The elongation of plasma flame and uniform temperature distribution were achieved by controlling the flow rate ratio of sheath gas to carrier gas. Furthermore, vortex flow structure in the coil zone was visualized by using PIV system.