采用内嵌边界方法模拟错列管束的磨损

采用内嵌边界方法,模拟研究了不同Stokes数St的煤灰颗粒穿过槽道中10×11错列不锈钢管束时的运动情况及其对管束的磨损规律.其中,流场与管束之间的耦合采用内嵌边界技术描述,颗粒的运动采用拉格朗日轨道模型求解.结果表明,不同St的颗粒有不同的运动特点,对管束造成的磨损也不同.第1排管束的平均磨损量在St=0.01,0.1时都较小,此后磨损量随着St的增大而增大.St=0.1时,第1排圆管的磨损量最小.靠近槽道壁面两列管束的平均磨损量大于中间管束,需加强防磨措施.

Numerical Investigation into Erosion of Staggered Tube Bank Based on Immersed Boundary Method

The immersed boundary method was applied to investigate particle-laden flow passing a 10×11 staggered stainless tube bank in a duct at different Stokes numbers.The dispersion of coal ash particles and the tube erosion yielded by the flow were studied in detail.The interactions between tubes and flow were simulated using the immersed boundary technique.The trajectories of the particles were tracked through the Lagrangian approach with two-way coupling.The results show that the particles at different Stokes numbers have quite different dispersion patterns,leading to different tube erosion characteristics.Particles at larger Stokes number cause more erosion on the first row of tubes.However,only slight erosion occurs when St=0.01 and 0.1,and particles cause the smallest erosion on the first row of tubes when St=0.1.More attention should be paid to the anti-erosion of the tubes near the side walls where mass erosion is greater than that of the tubes in the middle.