Numerical simulation study on erosion mechanism of pre-mixed abrasive water jet

Abstract

In order to optimize the parameters of the pre-mixed abrasive water jet cutting technology and make it more efficient in the coal mine gas environment, finite element analysis software LS-DYNA is used to simulate single abrasive particle of rock erosion rule and analyze the influence of different particle size, different grinding particle impact velocity, different abrasive particle shape on rock erosion effect. The results show that under the same conditions, the greater the impact velocity, the better the erosion effect, and the erosion rate of abrasive particles is almost linear with the erosion rate of rock. With an increase in velocity of abrasive particles, the erosion rate of cube shape of abrasive particles is gradually higher than that of spherical particles of abrasive. The larger the particle size of abrasive particles, the bigger the kinetic energy of them and also the erosion depth and erosion volume on the rock and steel. But when the particle size increases, the erosion rate of abrasive particles on the rock will decrease gradually. The research results provide theoretical basis for optimizing the parameters of pre-mixed abrasive water jet cutting.

Research Progress in Abrasive Water Jet Processing Technology

“…Compared with this, the contribution of water in the cutting of concrete is significant, as it reduces the effect of changes in traverse velocity on the depth of cut of concrete, resulting in a greater depth and width of cut in concrete than in steel. Meng et al [ 50 ] used the ANSYS/Ls-dyna method to simulate the mechanism of rock erosion by individual abrasive particles in an abrasive water jet and simulated the effects of different sizes of abrasives, shapes, and velocities on the erosion effect of rocks, and the results of their influence factor analysis provide a reference for the optimization of abrasive water jet cutting parameters. Wei et al [ 51 ] used coupled CFD-DEM to simulate the process of coal rock breaking by premixed abrasive water jets and investigated the influence law of abrasive mass fraction on the rock breaking effect.…”

Waterjet Erosion Model for Rock-Like Material Considering Properties of Abrasive and Target Materials

“…The parameters used for theoretical verification, including the pump pressure and the water and abrasive flow rates, are given in Table 2, along with the abrasive and target material properties (e.g., diameter, density, and hardness). Under these conditions, the Reynolds number of the abrasive waterjet was in the range 18,600-20,000 [9,44]. The drag coefficient for smooth spheres under this condition was used to solve Equation (11) [36].…”

Numerical simulation of the dynamic distribution characteristics of the stress, strain and energy of coal mass under impact loads

“…Majidi et al 52 , 53 used LS-DYNA software to study the properties of Holmquist-Johnson–Cook (HJC) model concrete. Meng and Liu et al 54 , 55 simulated the erosion effect of HJC model rock under impact loading based on LS-DYNA. Yuan et al 56 performed a numerical simulation of the rock SHPB experiment with the HJC model based on LS-DYNA.…”