高温高流速环烷酸冲刷腐蚀流场数值模拟研究  

Numerical Simulation of Naphthenic Acid Erosion-corrosion in High-temperature and Fast-flow Environments

作　　者：江克[1] 杨铁成[1,2] 陈学东[1,2] 张玮[1] 高增梁[1] 

机构地区：[1]浙江工业大学化工机械设计研究所,浙江杭州310032 [2]合肥通用机械研究院国家压力容器与管道安全工程技术中心,安徽合肥230031

出　　处：《压力容器》2010年第10期1-7,共7页Pressure Vessel Technology

基　　金：国家高技术研究发展计划(863计划)重点项目课题(2009AA044800);国家高技术研究发展计划(863计划)目标导向课题(2007AA04Z430)

摘　　要：采用CFD技术对高温高流速环烷酸喷射试验装置的流场进行数值模拟,主要分析了喷嘴至壁面距离H、喷嘴出口流速U和流体温度T的变化对喷嘴外部区域流场分布情况的影响。结果表明:随着U的增大,H和T的减小,壁面剪切应力逐渐增大;近壁处湍流强度随U的增大和H的减小而增强;减小H能增强喷射流体冲刷效果,但是H过小时,喷嘴出口压力过大,影响设备安全运行。为了提高试样壁面冲刷腐蚀效果,达到加速试验和安全运行目的,建议H取4～8 mm为宜。The CFD technology has been used to simulate the flow field of jet-impingement installation for naphthenic acid in high-temperature and fast-flow during erosion-corrosion test.The influence of the distance from the nozzle exit to the specimen surface（H）,the fluid velocity at the nozzle exit（U） and the temperature of the jet-impingement fluid（T） on the flow field＇s distribution of the nozzle exit in exterior domain are mainly analyzed.The results showed that the wall shear stress increased gradually as the U increased and the H,T decreased,and wall turbulence in the impingement region increased gradu-ally as the U increased and the H decreased;Although decreasing the H can significantly increase the fluid erosiont,he corresponding pressure at the nozzle exit also increased rapidly.This,in turn,influence the equipment operated safely.So the H should be chosen at 4 ～ 8 mm to improve experimental efficiency for accelerating test and insuring the safe running of the equipment.

关 键 词：环烷酸 冲刷腐蚀 壁面剪切应力 湍流强度 

分 类 号：TE986[石油与天然气工程—石油机械设备]