泵站压力管道振动特性分析及减振优化设计

为探究泵站压力管道的不同布置形式对管道振动的影响,选取宁夏盐环定泵站工程二泵站#1压力管道为研究对象,建立基于流固耦合的泵站压力管道水流ALGOR数值模型,并采用DASP振动测试系统获取振动信号对模拟结果进行验证,分析压力管道水流流态对管道振动的激励特征并提出优化设计方案。结果表明,压力管道进水管处、支管总管相接处及总出水管处均有强烈的振动,但进水管的振动较出水总管振动更为强烈;减振优化设计方案中,调整支管距离对降低水流对管道振动的激励效果微弱,增大管径及改变总管走向对其效果较好,其中总管走向在2°～5°之间较佳,不仅能降低管道振动,而且能减少泵站能耗损失。研究结果可为高扬程泵站压力管道的优化设计提供理论依据。

Vibration Characteristics Analysis and Vibration Reduction Optimization Design of Pump Station Pressure Pipeline

In order to explore the influence of different layouts of pumping station pressure pipelines on pipeline vibration, this study selected the No.1 pressure pipeline of the second pumping station of Ningxia Yanhuanding Pumping Station as the research object, and established water flow ALGOR model of pressure pipelines in pumping station based on fluid-solid coupling. The vibration signal from the DASP vibration test system was used to verify the simulation results. The excitation characteristics of the flow state of the pressure pipeline to the vibration of the pipeline were analyzed. And then an optimal design scheme was proposed. The results show that there is strong vibration in the inlet pipe of the pressure pipeline, the junction of the branch pipe and the total outlet pipe, but the vibration of the inlet pipe is stronger than that of the outlet pipe; In the optimization design of the vibration reduction, the excitation effect of water flow on pipeline vibration is weak when adjusting the distance of the branch pipe, and it is better to increase the diameter of the pipe and change the direction of the main pipe. The trend of the main pipe is better between 2° and 5°, which can not only reduce the vibration of the pipeline, but also reduce the energy consumption loss of the pumping station. The research results can provide a theoretical basis for optimal design of pressure pipes in high lift pumping stations.