直接空冷系统排汽管道的形式直接影响着各支管的流量分配和流动阻力.利用计算流体动力学( CFD)软件,在典型工况下,对某1 000MW超临界直接空冷排气管道内湿蒸汽的流场进行数值模拟,然后在排汽管道背部加装不同角度的倒角进行模拟得出最佳的倒角角度.结果表明:当管道背部倒角为30°时,分配管内流量分布较均匀,压降也有所降低.%The optimal design for exhausted ducting mode and internal structure in direct cooling exhausted duct system influence every steam to assign the flow obstruction and flow while managing to assign directly. The flowing filed of steam in direct air cooling exhausted duct for 1 000 MW power generating unit is simulated via Computational Fluid Dynamics( CFD) software under typical steam turbine conditions, and the best chamfer angle can be get by adding different chamfer angles in back of exhaust pipe. The result shows that the steam flows through each distribution pipe with balanced flow under the condition of chamfer angle of 30 ° and the flow resistance is much lower than before.
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