摘要
针对石化装置中高温减压塔底泵工作环境苛刻、汽蚀性能要求高的问题,对泵进行提高汽蚀性能改进设计,设计出两种两组水力模型。用CFX对3种工况两种相位的内部流场进行了数值模拟。模拟结果表明第一组水力模型汽蚀性能较优,制作成实型泵,并对整机进行汽蚀试验。当Q=406m3/h时,临界汽蚀余量CFD预测值为3.74m,试验值为4.02m,误差相差不大,达到了设计要求。CFD技术能够较准确预测离心泵汽蚀性能。
In petrochemical industry the working environment of vacuum tower bottom pump is harsh and its cavitation requirement is high. In view of this problem, the pump and made two groups of hydraulic model was designed. CFX was used to calculate flows under three discharges in two phase motion patterns. The simulation results show that the first hydraulic model is better than the second, so the first hydraulic model was made into full mold and also test was done. When Q = 406m^3/h, the predicted critical NPSH is 3.74m ,while the test critical NPSH is 4.02m, which meet the design commands and the deviation is not large. This shows that CFD technology is helpful on performance prediction of centrifugal pumps.
出处
《流体机械》
CSCD
北大核心
2010年第12期9-12,40,共5页
Fluid Machinery
关键词
减压塔底泵
汽蚀
双吸叶轮
CFD
汽蚀试验
vacuum tower bottom pump
cavitation
double-suction impeller
CFD
cavitation test
