-48V直流系统放电回路压降分配的研究

通信设备电源端子处的电压下限值是影响其正常运行的因素,而-48 V直流系统放电回路压降的分配决定了通信设备电源端子处的电压值。文中以现行规范为依据,结合工程实际讨论了-48 V直流系统中固定压降的分配方法。

泵系统的“守力图”和稳定性的第二方程——泵系统设计程序系列论文(一)

笔者用伯努利方程作为第一方程,推导出泵系统操作的“守力图”,揭示了泵系统操作的规律。用调节阀性能要求作为第二方程,确立泵系统的最大生产能力。泵系统设计中,在满足系统调节性能的同时,使泵的扬程最小,实现泵系统计算的最佳化。

离心泵系统“守力图”的应用——泵系统设计程序系列论文(三)

笔者用伯努利方程作为第一方程,推导出泵系统操作的"守力图",揭示了泵系统操作的规律。用调节阀性能要求作为第二方程,确立泵系统的最大生产能力。泵系统设计中,在满足系统调节性能的同时,使泵的扬程最小,实现泵系统计算的最佳化。

Control of Collection Efficiency for Axial Flow Cyclone Dust Collectors with Fixed Guide Vanes and with Funnel Shaped Exit Pipes

The experimental result of the collection efficiency of the axial flow cyclone with the fixed guide vanes is lower than that with the tangential inlet pipe to the cyclone body due to the weak angular momentum transfer given by flowing through the guide vanes. However, one of the interesting points is the control of the collection efficiency depended on the funnel shaped exit pipes. The collection efficiencies for these funnel shaped exit pipes are depended on the Froude number. Then, in this paper, the experimental results of the pressure drop and also the collection efficiency using the fly-ash particles and also the comparison of the calculated results of the collection efficiency with the experimental results are described i~ detail.