Numerical Simulation of Temperature Field and Pressure Field in High Velocity Oxygen Fuel Spray Gun

Finite-rate chemical model and Realizable k-e turbulent model were adopted for fluid dynamic computation so as to obtain the distribution of temperature field,pressure field and gas mass fraction inside the high velocity oxygen fuel(HVOF) spray gun.It was found that the distribution of oxygen and propane directly affected the position of burning zones in the gun,which affected the transformation of chemical-kinetic energy.In the combustion chamber,the location and the size of key burning area were closely related with temperature gradient and gas composition gradient.In HVOF spray gun,gas pressure gradient propelled gas to transmit along the pressure gradient,while pressure energy of high pressure gas in the combustion chamber was converted by Laval nozzle into kinetic energy.