The erosion wear of U-shaped elbow caused by the impact of high speed pulverized coal particles in gas-solid two-phase flow is studied by using computation fluid dynamics-discrete element method(CFD-DEM)and shear im-pact energy model(SIEM).The effects of particle size,gas flow velocity,particle shape of the U-shaped elbow on the wear are obtained and analyzed.The accuracy of the coarse-grained model applied to the wear process is also verified.The results show that there are three main erosion wear locations of U-shaped elbows.The wear rate shows an overall decreasing trend with the increase of particle size.The wear rate of U-shaped elbow arch back increases with the increase of gas flow velocity,and the peak positions of the first two wear rates shift to the inlet direction with the increase of gas velocity.The wear of the long ellipsoid on the U-shaped elbow is the most serious,followed by the flat ellipsoid,and the spherical one is the lightest.Coarse-grained CFD-DEM can predict the erosion wear of U-shaped tube accurately and significantly reduce the calculation time.
关键词
气固两相流/计算流体力学-离散单元法(CFD-DEM)/U形管/冲蚀磨损/颗粒形状/粗粒化模型
Key words
gas-solid flow/computation fluid dynamics-discrete element method(CFD-DEM)/U-shaped el-bow/erosion wear/particle shape/coarse-grain model
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