Abstract
Time-dependent 3-D simulation based on a large eddy simulation (LES) is successfully performed to clarify the complex thermofluid field and coherent structure of multi-scale vortices in a direct current - radio frequency (DC-RF) hybrid thermal plasma torch. The high temperature region has a large scale vortex structure, whereas the low temperature flow forms small eddies. The present simulation also yields reasonable results for vortex generation and unstable behavior at the interface between the high temperature plasma and the low temperature gas flows.
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