Numerical Calculation Of The Metal Melting In The Laser Loading Process

In this paper, the computational fluid dynamics method is used in the laser wallloading model to analyze the two-phase flow field and temperature field under theinfluence of the boundary layer flow field when metal melting. Reveal its structure ofspeed boundary layer and the temperature boundary layer, and the influence ofboundary layer flow field on laser wall loading characteristics.In the modeling process, similar criteria is used to simplify the calculationmodel, in order to adapt to the demand of computing time. Design the user definedfunctions, and successfully simulate the Gaussian distribution of the laser loadedmodel.The simulation results show that the thermal action of the laser load can beconsidered to act only on the irradiation spot position, and the influence of boundarylayer flow to laser wall loading characteristics can not be ignored. In the subsonicspeed range, the influence of the boundary layer flow mainly to the pneumaticcooling effect. In the early stages of development of the molten pool, under theinfluence of pneumatic cooling effect, the movement speed of molten pool boundaryto the downstream of the direction of airflow is faster than the speed to the upstream.However, with the increase of pool depth, the development of the molten pool willshow the opposite trend. In the loading process, the rate trend of melting boundarygoes to the internal target is accelerating. It’s good for loading process if the laserloading energy can be directly inside the target internal.