为了研究氧气-空气混合助燃超音速火焰喷涂过程中预混气体当量比对焰流特性的影响，基于FLUENT软件建立了焰流的计算流体力学（CFD）模型．运用有限元软件LS-DYNA来研究不同粒径Ni60粒子的撞击行为，并与粒子截面的 SEM 形貌进行了对比...为了研究氧气-空气混合助燃超音速火焰喷涂过程中预混气体当量比对焰流特性的影响，基于FLUENT软件建立了焰流的计算流体力学（CFD）模型．运用有限元软件LS-DYNA来研究不同粒径Ni60粒子的撞击行为，并与粒子截面的 SEM 形貌进行了对比．结果表明：合理的丙烷和全部氧气的当量比应小于1.2；在燃气过量时，焰流中过多的N2会引起熄燃；与基体结合较好的粒子尺寸为20～40,μm；粒径小于20,μm的粒子速度高，回弹力大，与基体结合力差；粒径大于50,μm的粒子速度低，熔化不充分，粒子与基体结合面缺陷较多．展开更多
The performance of a newly developed Silicon Strip Detector (SSD, by Tan Jilian's Group) has been tested. The active area of the SSD is 48mm×20 nan and the thickness of the silicon wafer is 300μm. The front ...The performance of a newly developed Silicon Strip Detector (SSD, by Tan Jilian's Group) has been tested. The active area of the SSD is 48mm×20 nan and the thickness of the silicon wafer is 300μm. The front surface is divided into 16 equally distributed strips with 3 mm in width and 20 mm in length for each. The gap betweentwo strips is 140μm. The back surface is unstripped. The thickness of the front window is designed to be 0.1μm, and the back window is 0.5μm.展开更多
文摘为了研究氧气-空气混合助燃超音速火焰喷涂过程中预混气体当量比对焰流特性的影响，基于FLUENT软件建立了焰流的计算流体力学（CFD）模型．运用有限元软件LS-DYNA来研究不同粒径Ni60粒子的撞击行为，并与粒子截面的 SEM 形貌进行了对比．结果表明：合理的丙烷和全部氧气的当量比应小于1.2；在燃气过量时，焰流中过多的N2会引起熄燃；与基体结合较好的粒子尺寸为20～40,μm；粒径小于20,μm的粒子速度高，回弹力大，与基体结合力差；粒径大于50,μm的粒子速度低，熔化不充分，粒子与基体结合面缺陷较多．
文摘The performance of a newly developed Silicon Strip Detector (SSD, by Tan Jilian's Group) has been tested. The active area of the SSD is 48mm×20 nan and the thickness of the silicon wafer is 300μm. The front surface is divided into 16 equally distributed strips with 3 mm in width and 20 mm in length for each. The gap betweentwo strips is 140μm. The back surface is unstripped. The thickness of the front window is designed to be 0.1μm, and the back window is 0.5μm.
