文献类型：期刊文献

英文题名：Numerical simulation and structural optimization of a high-pressure supercritical CO2 fracture based on jet characteristics

作者：Yang, Fan Ding, Yong An, Zhoujian Du, Xiaoze Cui, Zuo Zhang, Dong Fu, Jian

第一作者：杨菲;Yang, Fan

通信作者：Ding, Y[1];An, ZJ[1]

机构：[1]Lanzhou Univ Technol, Sch Energy & Power Engn, Lanzhou 730050, Peoples R China;[2]Guizhou Inst Technol, Sch Aerosp Engn, Guiyang 550025, Peoples R China

第一机构：Lanzhou Univ Technol, Sch Energy & Power Engn, Lanzhou 730050, Peoples R China

通信机构：corresponding author), Guizhou Inst Technol, Sch Aerosp Engn, Guiyang 550025, Peoples R China.|贵州理工学院;

年份：2026

卷号：305

外文期刊名：APPLIED THERMAL ENGINEERING

收录：;EI(收录号：20263421336720);Scopus(收录号：2-s2.0-105047651717);WOS:【SCI-EXPANDED(收录号:WOS:001856633200001)】；

基金：This work was financially supported by the Guizhou Provincial Major Scientific and Technological Program (XKBF(2025)031); the Guizhou Science and Technology Innovation Leading Talent Workstation (KXJZ(2025)024); the Guizhou Provincial Basic Research Program (Natural Science) (MS[2025]189; ZD[2026]076; ZD[2026]077); the Academic New Seed Cultivation and Innovation Exploration Project (Guizhou Institute of Technology) [2024XSXM007]; the Higher Education Institution Scientific Research Project of Guizhou [(2022)264]; and the Wuwei City Major Science and Technology Special Projects (WW25A03ZDQ002).

语种：英文

外文关键词：Supercritical CO2; Jet structure; Flow characteristics; Phase change

摘要：The application of supercritical CO2 (S-CO2) for coal and rock fragmentation has emerged as an important research direction in the field of carbon capture, utilization, and storage (CCUS). This study employs computational fluid dynamics to numerically simulate the jet structure and flow characteristics during S-CO2 release from the expansion tube of a fracturing device. User-defined real gas models (UDRGM) and user-defined functions (UDFs) are used together with a table-lookup method and pressure-temperature bilinear interpolation. The mixture multiphase model, Lee phase-change model, and SST k-omega turbulence model are coupled to capture transient variations in flow and thermodynamic properties during jetting. The effects of nozzle diameter and nozzle location on the flow field, pressure characteristics, and velocity distribution of confined S-CO2 jets are systematically investigated. Results indicate that increasing nozzle diameter significantly improves the impact loading characteristics associated with fracturing effectiveness. The average maximum wall pressure increases from 6.01 MPa to 9.84 MPa (63.73%), while the pressure-duration product increases from 39.18 MPa & sdot;ms to 71.50 MPa & sdot;ms (82.49%). Moving the nozzle closer to the high-pressure source prolongs the high-pressure loading duration on the rock wall and increases the average maximum wall pressure from 7.67 MPa to 9.80 MPa (27.77%). Comparative analysis indicates that nozzle diameter is the dominant parameter governing fracturing effectiveness, while nozzle position plays a secondary role. These findings provide theoretical support for nozzle optimization and the design of S-CO2 jet fracturing devices.