为提高管网二次加氯后消毒剂与水的混合均匀性，开发了基于螺旋流的药剂快速、低损的混合管件。通过建立混合管件的物理模型，采用Mixture多相流模型和Realizable k-ε湍流模型进行CFD数值计算，分析了混合管件的混合机理，对混合管件内导流叶不同参数下的混合效果和压力损失进行了对比研究。结果表明：水流在流经混合管件后能够改变流体的流线，使流体从一维运动变为三维运动，在管道横截面形成漩涡，促进混合效果。通过分析管道各个横截面的不均匀系数cov值可知，导流叶个数为3个时，混合效果最佳，压力损失约为157Pa；导流叶包角在20~30°内，提高包角角度能改善混合效果，但当包角度超过30°后，混合效果趋于稳定；导流叶高度在0.2~0.35倍管径时，导流叶高度越高，混合效果越好，但压力损失也随之增大。

In this study, in order to improve the mixing uniformity of the disinfectant in water after the secondary chlorination of the pipe network, a new type of mixing pipe fitting with high efficiency and low loss was developed. Through the establishment of physical model, the CFD numerical simulation optimization was carried out using the mixture multiphase flow model and the Realizable k-ε turbulence model. The mixing mechanism of this device was analyzed, and the mixing effect and the pressure loss under the different parameters of the guide vanes were estimated. The results show that, the streamline of the multiphase flow could be changed after flowing through the pipe fitting, and the fluid changes from one-dimensional motion to three-dimensional motion. The mixing effect was promoted by the vortex formed in the cross-section of the pipeline. By analyzing the COV of each cross-section of the pipe, the optimum number of guide vanes for the mixing effect was 3, and its pressure loss was about 157Pa.The mixing effect was enhanced rapidly with the increasing of wrap angle in the range from 20°~30°. When the angle was more than 30°, the mixing effect tended to be stable. When the guide vane height was 0.2 ~ 0.35 times the diameter, the higher the height of guide vanes, the better the mixing effect, moreover, the pressure loss also increased.