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.
出处
《压力容器》
北大核心
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)
关键词
环烷酸
冲刷腐蚀
壁面剪切应力
湍流强度
naphthenic acid
erosion-corrosion
wall shear stress
turbulent intensity
