Abstract: Particle impact inside a sandblaster is the main cause of sandblaster failure. To study the motion of the particles inside sandblasters， the EDEM-Fluent coupling method was used to analyze the characteristics of the gas-solid two-phase flow. The particle image velocimetry(PIV)method was used to obtain the particle motion inside the sandblasting tank to verify the model’s validity. The results demonstrated that after the high-speed gas enters the machine， a major vortex drives the motion of the bottom particles and gradually stabilizes in the axial section. Another vortex is generated and located in the geometric center of the horizontal plane. The particles are driven by the high-speed gas and blown up to a gradually stable height and the particle velocity is about 8% and 10% of the neighboring airflow. The local and overall errors of the simulation results and test results are less than 10%， indicating that the coupling calculation method is practical and feasible.

Key words: sandblasting machine; solid particle; EDEM-Fluent coupling; PIV method