Studies of Computational Fluid Dynamics in the Flow Field of a High Velocity Wire Arc Spray Gun

The fluid dynamics in the jet field of a high velocity wire arc spray gun is one of the key factors to coating qualities. With the application of Fluent, the jet flow dynamics of a spray gun is simulated and computed, which concludes that the jet field could be characterized by three regions: the core region, the entrainment region, and the fully turbulent region. Influenced by the intersecting and reflecting of shock waves, the velocity distribution of the jet is non-homogeneous and asymmetric, and the axis velocity is severely fluctuated. Moreover, The flow in the wire plane is more divergent than that in the wires’ vertical plane. Therefore, it’s an important way to improve spray quality with appropriate spray distance and a special designed cap.