中文摘要：

某石化公司的RON2×14型离心式甲铵泵，其在运行过程中出现振动高，电流高等故障，停泵检修后发现第一级叶轮出现汽蚀现象。汽蚀现象是离心泵比较常见的失效形式之一，引起汽蚀的原因很多，叶片内部复杂的湍流就是产生汽蚀的一个主要原因。随着计算机技术和计算方法的发展，计算流体力学（CFD）技术已实现了对离心泵内部流动状态的合理仿真分析，采用数值模拟方法来研究离心泵内流体流动规律，使得利用数值仿真结果来指导泵的设计成为可能。本文应用CFD软件CFX研究该甲铵泵的内部流体流动，分析该甲铵泵汽蚀的产生原因，对其汽蚀特性进行数值仿真模拟，分析总结甲铵泵内汽一液两相流体的分布规律，实现改善该泵的汽蚀性能的目的。

英文摘要：

A petrochemical company＇s RON 2×14 centrifugal carbomate pump was found the high libration and noise phenomenon in the process of operation. After stopped the pump immediately, we can speculate that the first stage impeller cavitation is the reason through checked and rectified. Complex turbulence inside the blade is one of many important reasons for cavitation. With the development of the computer technology and numerical technology these years, Computational Fluid Dynamics （CFD） software is used in the centrifugal pump to analyze the internal flow state. It is a new reasonable method for designing centrifugal pump. In this paper, we use CFX soRware to analysis the internal turbulent flow of the ammonium carbamate pump, the main reasons for cavitation inside the carbomate pump and the discipline of vapor-liquid two phase flow field distribution inside the centrifugal carbomate pump, to achieve the purpose of improve the cavitation performance of the pump.