Experimental and Numerical Evaluation of the Performance of Supersonic Two-Stage High-Velocity Oxy-F

• 作 者: H.Katanoda H.Morita M.Komatsu S.Kuroda
• 机 构: Department of Mechanical Engineering,Kagoshima University,1-21-40 Korimoto,Kagoshima 890-0065,Japan,
• 出 处: Journal of Thermal Science
• 发表日期: 2011年01期
• 关键词: barrel supersonic combustion straight chamber spray Velocity throat validated mi

The water-cooled supersonic two-stage high-velocity oxy-fuel (HVOF) thermal spray gun was developed to make a coating of temperature-sensitive material,such as titanium,on a substrate.The gun has a combustion chamber (CC) followed by a mixing chamber (MC),in which the combustion gas is mixed with the nitrogen gas at room temperature.The mixed gas is accelerated to supersonic speed through a converging-diverging (C-D) nozzle followed by a straight passage called the barrel.This paper proposes an experimental procedure to estimate the cooling rate of CC,MC and barrel separately.Then,the mathematical model is presented to predict the pressure and temperature in the MC for the specific mass flow rates of fuel,oxygen and nitrogen by assuming chemical equilibrium with water-cooling in the CC and MC,and frozen flow with constant specific heat from stagnant condition to the throat in the CC and MC.Finally,the present mathematical model was validated by comparing the calculated and measured stagnant pressures of the CC of the two-stage HVOF gun.

The water-cooled supersonic two-stage high-velocity oxy-fuel (HVOF) thermal spray gun was developed to make a coating of temperature-sensitive material, such as titanium, on a substrate. Gun has a combustion chamber (CC) followed by a mixing chamber (MC), in which the combustion gas is mixed with the nitrogen gas at room temperature. The mixed gas is accelerated to supersonic speed through a converging-diverging (CD) nozzle followed by a straight passage called the barrel. paper proposes an experimental procedure to estimate the cooling rate of CC, MC and barrel separately. Chen, the mathematical model is presented to predict the pressure and temperature in the MC for the specific mass flow rates of fuel, oxygen and nitrogen by assuming chemical equilibrium with water-cooling in the CC and MC, and frozen flow with constant specific heat from stagnant condition to the throat in the CC and MC. Finally, the present mathematical model was validated by comparing the calculated and measured sta gnant pressures of the CC of the two-stage HVOF gun.