TY - EJOU
AU - Yang, Xiaofeng
AU - Li, Yanhong
AU - Nie, Aiguo
AU - Zhi, Sheng
AU - Liu, Liyuan
TI - Numerical Study on Rock Breaking Mechanism of Supercritical CO2 Jet Based on Smoothed Particle Hydrodynamics
T2 - Computer Modeling in Engineering \& Sciences
PY - 2020
VL - 122
IS - 3
SN - 1526-1506
AB - Supercritical carbon dioxide (Sc-CO2) jet rock breaking is a nonlinear impact
dynamics problem involving many factors. Considering the complexity of the physical
properties of the Sc-CO2 jet and the mesh distortion problem in dealing with large
deformation problems using the finite element method, the smoothed particle
hydrodynamics (SPH) method is used to simulate and analyze the rock breaking process
by Sc-CO2 jet based on the derivation of the jet velocity-density evolution mathematical
model. The results indicate that there exisits an optimal rock breaking temperature by Sc-CO2. The volume and length of the rock fracture increase with the rising of the jet
temperature but falls when the jet temperature exceeds 340 K. With more complicated
perforation shapes and larger fracture volumes, the Sc-CO2 jet can yield a rock breaking
more effectively than water jet, The stress analysis shows that the Sc-CO2 rock fracturing
process could be reasonably divided into three stages, namely the fracture accumulation
stage, the rapid failure stage, and the breaking stabilization stage. The high diffusivity of
Sc-CO2 is identified as the primary cause of the stress fluctuation and W-shaped fracture
morphology. The simulated and calculated results are generally in conformity with the
published experimental data. This study provides theoretical guidance for further study
on Sc-CO2 fracturing mechanism and rock breaking efficiency.
KW - Supercritical carbon dioxide jet
KW - rock breaking
KW - SPH
KW - stress distribution
KW - erosion morphology
DO - 10.32604/cmes.2020.08538