Research on the unified multi-mechanism gas transport model and flow characteristics based on improved QSGS method
ZHANG Hongtu
WEI Jiaqi
WANG Dengke
LI Botao
BAI Yun
HE Biao
YUAN Mingyu
LU Weiyong
Abstract：A unified transmission model of gas multi-mechanism was established based on gas flow theory to accurately reveal the flow characteristics of gas in authentic coal seams.The im-proved quartet structure generation set(QSGS)was utilised to construct a geometric model.The pore structure of coal is efficaciously characterised by this model.The two-point correla-tion function was employed to verify the pore structure.The gas velocity distribution and gas flow variation law of gas transmission models with different flow mechanisms and gas multi-mechanism unified transmission models under different inlet pressures were analysed through numerical simulation.The results indicate that a similar trend of change on the exponential fit-ting curve is exhibited by the two-point correlation coefficient curves of the pore structure re-constructed by the improved QSGS method and the pore structure of the real coal.This indi-cates that the pore structure of real coal can be accurately characterized by the reconstructed structure.The number of pores and effective migration channels of the reconstructed pore structure are positively correlated with porosity.The pore distribution becomes more uniform as the probability of the initial growth nucleus distribution increases.Compared with other transmission models of flow mechanism,the unified transmission model of gas multi-mecha-nism has the largest gas velocity and flow rate.This model is closer to the gas flow law in the pores of real coal.The gas flow rate increases slightly with the increase of the initial growth nucleus distribution probability.The error between the gas flow rate simulated by the gas multi-mechanism unified transmission model and the measured flow rate increases from 8.7％to 10.1％with the increase in the initial growth nucleus distribution probability.The gas ve-locity increases significantly at the narrow aperture because of the increase in inlet pressure.The gas flow rate shows a nonlinear growth trend.Under different inlet pressures,the maxi-mum error between the simulated flow rate of the gas multi-mechanism unified transmission model and the measured flow rate is 10.2％.The gas multi-mechanism unified transmission model's description of the gas flow law is closer to the real coal flow situation.
Keywords：quartet structure generation setgas multi-mechanism flowtransmission modelflow characteristicnumerical simulation
Publication Date：2025-05-30
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：13( 640-652 )