Optimum Control of Plasma Flow Systems through Multi-Scale Integration

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In the present study, the plasma flow systems with multi-scale interactions are analyzed by using multi-scale control method and multi-scale integration to give the fundamental data for cold spray, plasma assist combustion, arc melting process and gas circuit breaker. The obtained results are as follows.1. An integrated model for advanced cold spray process is constructed by integrating nano-micro particle flow model and coating formation model. It is clarified that electrostatic acceleration of nano-particle is effective in the presence of shock wave. The deposition process in the cavity is also clarified by comparing with cold spray experiment.2. The pulsed arc torch and dielectric barrier discharge torch with small input power are developed to produce oxygen and nitrogen radicals and ozone for combustion assist. The effects of applied voltage and frequency on radical concentrations are clarified experimentally. Time evolution of chemical species in an air plasma are also clarified numerically using complex reaction model3. Real time simulations are conducted for purpose of compactness of gas circuit breaker (GCB) and optimization of arc melting process. It is clarified that rough structure in the exhaust tube enhances the rapid cooling of exhaust hot gas for compact GCB. It is shown that the temperature dependent surface tension and mushy zone effect the melting pool structure in an arc-melting systems.