Visualization of Supersonic Jet from High-Velocity Oxy-Fuel Thermal Spraying Gun by Numerical Simulation

Supersonic jets from a high-velocity oxy-fuel thermal spraying gun have been simulated and visualized by numerical analysis. The thermal spraying gun in the present simulation has the same shape as that of a commercially used gun. To visualize the jet structure, the equi-Mach number contours of supersonic jets have been depicted, and the Mach number and static pressure distributions along the jet axis have been, calculated both for under-expanded and correctly-expanded supersonic jets. For under-expanded jets, the "diamond shock" pattern has been observed.