为了研究方锥管布浆器内的流动特性,采用计算流体动力学方法,对方锥形布浆总管内速度分布、压力分布及支管束的质量流量分布进行了分析,并对Baines简化型、分段近似型和改进型3种不同结构的总管进行了对比研究.结果表明：常用的简化型总管,其内部流动存在显著的不均匀性,沿总管方向有明显的压力梯度,导致支管束的质量流量沿总管方向分布不均匀.分段逼近型和改进型总管内也存在明显的压力梯度和浆料分布的不均匀性.3种结构总管支管束的质量流量分布与期望值均有较大偏差,按简化型、分段近似型、改进型顺序依次增大.基于Baines方法设计的方锥形总管后壁形状与期望形状差别较大.

In order to reveal the flow characteristics of fluid in rectangular tapered pulp distributor,the velocity and pressure distributions in the rectangular tapered header as well as the mass flowrate distribution out of manifold tubes were investigated based on computational fluid dynamics.Then,three kinds of rectangular tapered headers respectively in simplified type,piecewise approximated type and modified type were comparatively investigated.The results show that there are distinct velocity nonuniformity and pressure gradient along the flow direction in the widely-used simplified header,which results in nonuniform mass flowrate out of the manifold tubes,and that the pressure and the mass flowrate in both the approximated the modified headers are also obviously nonuniform.It is also found that and the mass flowrate distributions in the three headers,which has notable deviation from the expected ones,increase in the order of simplified typepiecewise approximated typemodified type,and that the back wall shape of the rectangular tapered header designed based on the Baines method is greatly different from the expected one.