抄録
The two-stage High Velocity Oxy-Fuel (HVOF) thermal spray gun has a mixing chamber between a combustion chamber and a supersonic nozzle followed by a straight barrel. The combustion gas is discharged into the mixing chamber, then the gas temperature is lowered in the chamber by injecting nitrogen gas at room temperature. The lowered gas temperature is beneficial from the view point of less oxidation of the spray particle accelerated and heated by the mixed gas. In this paper, the characteristics of the gas in the mixture chamber are clarified by the comparison between the cold-flow experiment and theoretical calculation.
