Heat transfer and visualization of the flow on the surface of a copper plate when it is flowed around by air plasma jets
The heat transfer between subsonic air plasma jets flowing from a water-cooled slit nozzle with an outlet cross-section of 40 × 8 mm and the surface of a copper plate at an angle of attack was experimentally investigated in the HF plasmatron VGU-4 of IPMech RAS. Using copper thermal capacitance calorimeters, the distributions of heat fluxes along the axis of symmetry of the plate of 50 × 50 mm were obtained depending on the power of the anode power supply of the HF generator of the plasmatron and the angle of attack. The study introduced and tested a method for visualizing the flow near the plate surface at the angle of attack, based on the injection of acetylene into the boundary layer. We obtained the spectrum of air plasma and the spectrum of air plasma when acetylene is injected into the flow through holes on the plate surface. Upon injection of acetylene into the main flow, a significant increase in the emission of cyanogen (CN) was noted, and Swan bands (C2) were observed.
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