Simulation Analysis of Two-Phase Flow Field in Robotic Sand Blasting with Aluminum Alloy Car Body

Pneumatic sand blasting is an efficient surface treatment technology. To investigate the impact of pneumatic sand blasting nozzle structure dimensions on the resulting flow field characteristics and sand blasting effectiveness, this study initially establishes a two-phase flow model based on the Euler-Lagrange method using Computational Fluid Dynamics (CFD) techniques. The internal flow field inside the nozzle and the movement characteristics of solid particles, such as trajectory and velocity, are simulated and analyzed by Fluent software. Then, a comparative analysis is conducted on the variation in flow field pressure and velocity distribution under different shrinkage angles and particle diameters. The results indicate that the ejection velocity of particles accelerated by the nozzle reduces as the particle diameter increases. The nozzle with a shrinkage angle of 30 degrees displays the most stable variation in gas velocity and pressure, with a smaller interval of discreet distribution in particle flow fields. Moreover, a higher proportion of high-speed particles is observed, leading to an enhanced pneumatic sand blasting effect. The research results provide a basis for the design of high-efficiency nozzle for pneumatic sand blasting and the selection of optimal process parameters.