摘要
流量的测量精度受流量计上游速度分布的影响极大。仪表是在流体速度充分发展的条件下设计和校正的, 而流体的扰动如偏流、二次流、旋转流都能引起系统误差。在前置管段安装整流器是解决直管段不够的有效途径。根据计算流体力学分析了水平式浮子流量计浮子抖动的原因,设计了安放在流量计内部的列状整流器,给出并比较了安装和未装整流器情况下的内部流场变化的仿真结果,同时评估了整流器的整流效果。为了验证其整流效果, 该整流器在两种不同口径的水平浮子流量计中进行现场试验,结果表明列状整流器能降低仪表的不确定度达0．5％以上。
Flow measurement is strongly influenced by the velocity profile upstream the flowmeter. Flowmeters are designed and calibrated under the condition that the velocity is fully developed, while the disturbance such as swirl, cross-flow and asymmetry will induce the system errors. Mounting conditioner is a effective way for solving this problem. A novel flow conditioner is presented based on computational fluid dynamics（CFD）. Flow fields in the horizontal rotameter with and without the scalariform multiple holes conditioner are simulated. In order to testify the efficiency, the conditioner are installed in two different caliber rotameters and the field tests are carried out. In fact, the conditioner in the horizontal floater flowmeter decreases the uncertainty by 0.5%.
出处
《机械工程学报》
EI
CAS
CSCD
北大核心
2006年第2期183-186,191,共5页
Journal of Mechanical Engineering
