The outlet conduit is an important construction connecting the outlet of the pump guide vane and the outlet pool; in order to study the hydraulic performance of the straight outlet conduit of the axial-flow pump device, this paper adopts the method of numerical simulation and analyzes the influence of the division pier on the pressure and velocity distribution inside and near the wall of the straight outlet conduit based on three design schemes. Four pressure pulsation measuring points were arranged in the straight outlet conduit, and the low-frequency pulsation characteristic information inside the straight outlet conduit with and without the division pier was extracted by wavelet packet reconstruction. The results show that the addition of a division pier has an effect on the hydraulic loss, near-wall pressure and velocity distribution in the straight outlet conduit. A small high-pressure zone is formed near the wall at the starting position of the division pier, and a large high-speed zone is formed on the left side at the starting position of the division pier. The length of the division pier has no significant effect on the flow distribution of the straight outlet conduit and the pressure and velocity distribution near the wall. Under different working conditions, each monitoring point has the maximum energy in the sub-band (0~31.25 Hz). With the increase of the flow rate, the total pressure energy of the straight outlet conduit decreases gradually. Under each condition, the difference of the energy proportion of the horizontal monitoring points of the straight outlet conduit is small, and the difference of the energy proportion of the two monitoring points at the top and bottom of the outlet channel is relatively large. The energy of the two monitoring points in the straight outlet conduit with a division pier is smaller than that of the two monitoring points in the straight outlet conduit without a division pier. There are differences in the main frequency and the power spectrum corresponding to the main frequency of the monitoring points in the straight outlet conduit, and the reasonable setting of the division pier is conducive to reducing the pressure pulsation of the flow in the straight outlet conduit and is beneficial to the safe and stable operation of the pump device.

中文翻译：

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分隔墩对轴流泵出口管道内流和脉动影响的研究

出水管是连接泵导叶出口与出水池的重要结构；为研究轴流泵装置出水直管的水力性能，采用数值模拟的方法，分析了分隔墩对直管壁内及近壁处压力和速度分布的影响。基于三种设计方案的出口导管。在出水直管内布置4个压力脉动测点，通过小波包重构提取出有和无分隔墩的出水直管内的低频脉动特征信息。结果表明，增加分隔墩对水力损失有影响，直出口管道中的近壁压力和速度分布。在分隔墩起始位置靠近墙体形成一个小的高压区，在分隔墩起始位置的左侧形成一个大的高速区。分隔墩的长度对直出水管的流量分布和壁面附近的压力和速度分布没有显着影响。在不同的工作条件下，每个监测点在子带（0~31.25 Hz）内具有最大能量。随着流量的增加，直出口管道的总压力能逐渐减小。各工况下，直出水管水平监测点能量比重差异较小，出口通道顶部和底部两个监测点的能量比例差异较大。有分隔墩的出水直管内两个监测点的能量小于无分隔墩的出水直管内两个监测点的能量。出水直管内各监测点主频率对应的主频和功率谱存在差异，合理设置分隔墩有利于减少出水直管内水流的压力脉动和有利于泵装置的安全稳定运行。有分隔墩的出水直管内两个监测点的能量小于无分隔墩的出水直管内两个监测点的能量。出水直管内各监测点主频率对应的主频和功率谱存在差异，合理设置分隔墩有利于减少出水直管内水流的压力脉动和有利于泵装置的安全稳定运行。有分隔墩的出水直管内两个监测点的能量小于无分隔墩的出水直管内两个监测点的能量。出水直管内各监测点主频率对应的主频和功率谱存在差异，合理设置分隔墩有利于减少出水直管内水流的压力脉动和有利于泵装置的安全稳定运行。