Modeling of the natural gas HVOF process

摘要

A supersonic external flow and high particle velocities, which lead to low porosity coatings, characterize the High Velocity Oxygen Fuel (HVOF) process. A numerical study of this process is proposed in the present work. In a first step, the PHOENICS CFD code is used for the computation of the flow inside a CDS gun and within the supersonic external jet: a two-dimensional axisymmetric geometry is used. The combustion model assumes chemical equilibrium whereas the turbulence effect is taken into account using the Chen-Kim k-s model, which is appropriate for the computation of round jets. In a second step, an in-house code is used in order to simulate the flow/particles interactions. Finally, numerical results obtained on in-flight particle characteristics are compared with measurements obtained with the DPV2000 system.