多级离心式森林消防泵的抗汽蚀性能研究

发布时间：2018-03-30 02:27

本文选题：多级离心泵　切入点：汽蚀　出处：《北京林业大学》2012年硕士论文

【摘要】：汽蚀是水轮机、水泵等水力机械中产生的一种特有现象。离心泵在使用时,如果安装高度过高或者吸水管路布置不合理,泵内容易产生汽蚀现象。汽蚀现象的出现严重影响了泵的正常工作,降低了泵的寿命。泵汽蚀余量大小是评价离心泵性能好坏的一项重要指标。本文以BJL三级离心式森林消防泵为研究对象,分别使用试验方法与数值模拟方法对其汽蚀性能进行分析。在现有水泵测试平台的基础上,完成了开式泵汽蚀试验系统的搭建设计工作,对消防泵进行了性能测试试验和汽蚀试验。使用CFD软件ANSYS CFX对消防泵进行了整机流场的单相流模拟以及首级叶轮的两相汽蚀模拟,将模拟结果与试验结果进行了对比,验证了使用数值模拟方法分析该系列消防泵的可行性。数值模拟的结果显示了泵内部的压力分布与叶轮内汽蚀现象产生的气泡分布,为下一步消防泵的综合优化提供参考依据和研究方法。得到了三级离心式森林消防泵的临界汽蚀余量,对该水泵在实际使用中安装高度的确定提供计算依据,并计算得到了水泵在特定使用条件下的许用安装高度,结果显示消防泵的安装高度达到了设计要求。
[Abstract]:Turbine cavitation is a special phenomenon, such as pump in hydraulic machinery. The centrifugal pump in use, if the installation height is too high or water pipe layout is not reasonable, easy to produce cavitation within the pump. The cavitation phenomenon has seriously affected the normal work of the pump, reduce the service life of the pump. The pump cavitation size is an important index to evaluate the performance of centrifugal pump performance.
In this paper BJL three stage centrifugal fire pump as the research object, using test method and numerical simulation method to analyze the cavitation performance. Based on the existing water pump test platform, completed the open pump test system design work, carried on the fire pump performance test and cavitation test. CFD software ANSYS CFX to simulate the fire pump and impeller cavitation two-phase flow simulation of single-phase machine field, the simulation results were compared with the experimental results, the analysis is verified by numerical simulation method and feasibility of the fire pump series. Numerical results show that the distribution of bubble cavitation phenomenon and the pressure distribution inside the pump impeller in the reference and research methods for the comprehensive optimization of the next fire pump. By three stage centrifugal forest fire pump npsh, The calculation basis for the installation height of the pump is given, and the allowable installation height of the pump under certain conditions is calculated. The result shows that the installation height of the fire pump has met the design requirements.

【学位授予单位】：北京林业大学
【学位级别】：硕士
【学位授予年份】：2012
【分类号】：TH311

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