2352 2段高速フレーム溶射ガンにおける燃焼ガスと窒素ガスの混合状態の理論解析(S46-5 圧縮性流れの基礎と応用(混相流),S46 圧縮性流れの基礎と応用)  [in Japanese] 2352 Theoretical Analysis of Combustion-Gas Conditions Mixed with Nitrogen for Two-Stage HVOF Thermal Spray Gun  [in Japanese]

The two-stage High Velocity Oxy-Fuel (HVOF) thermal spray gun developed by the authors 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. In this paper, the gas properties in the mixing chamber are calculated for a wide range of mass flow rates of nitrogen gas.