Abstract: The internal flow characteristics of axial flow absorbers were numerically studied by the computational fluid dynamics(CFD) method. The influences of three absorber models on the internal flow uniformity were compared: absorber without a flow distributor,absorber with a single flow distributor,and absorber with the combination of a flow distributor and a baffle. The results show that the flow is severely uneven without a flow distributor,is slightly meliorated with a single flow distributor,and is significantly improved with the combination of a flow distributor and a baffle. For the combined configuration,the best flow uniformities are obtained with the pore diameter of 0.003 m as the pore opening ratio remains unchanged and with the pore opening ratio of 0.388 as the pore diameter does not change.