变角度Y型分支管气力输送流量分配特性研究

Experimental Research on Flow Distribution For Changeable Angle Y-shaped Branch Pipe in Pneumatic Conveying

以压缩空气为输送介质,粒径相同而密度不同的小米和空心玻璃珠为输送物料,在水平变角度Y型分支管气力输送试验台上对气固两相的流量分配特性进行了研究。试验结果表明,在保持发送压力恒定条件下,当两分支管路与主管夹角相同时,流动参数的变化对流量分配特性的影响不大。当两分支管路与主管夹角不同时,随变动支管与主管夹角增大,分配到变动支管内固相流量逐渐减少;同时发现,当表观气速处于高速区时,变动支管与主管夹角是影响固相流量分配的主要因素;而当表观气速处于低速区时,流量分配特性变化较大。最后,通过对比,发现固相密度对流量分配特性影响不大。

The gas-solid two phase experimental apparatus was established to study the gas-solid two phase flow distribution characteristics of Y-shaped branch pipe. The pneumatic conveying experiments for millet and Micro-glass beads with same average particle diameter and different densities were carried out by using compressed air in horizontal branch pipe. The results show that the operation pressure of the system keep to a constant value, the flow distribution characteristics is little affected by the flow parameter in the case of same angle between the branch and main pipe. Distributional solid mass fraction decreases in the pipe with the mgle between the changeable pipe and main pipe increasing in the experimental situation. As for the identical branch pipe, when the superficial gas velocity is greater than the deposition velocity, its change has little effect on solid-phase distribution characteristics, while the angle between the changeable branch and main pipe is the chief influence factor. While in the low gas velocity zone, the flow distribution characteristics changes greatly. Finally, by contrasting the two kinds of conveying material, the solid density influences the flow distribution characteristics less.