摘要
超声流量计非实流标定方法中一个尚待解决的问题是超声探头安装位置对流量测量的影响,该问题始终制约着超声流量计非实流标定技术的发展。为解决这一难题,提出利用计算流体动力学数值仿真来研究这一问题的方法。基于实流试验获得超声流量计探头位置对其测量结果的定量影响,并将其作为数值仿真依据,探索仿真模型建立方法;在验证数值仿真方法的基础上对超声探头的两个典型安装位置——全伸和全缩进行研究;通过分析流场流动机理、各声道速度分布以及探头处的流场变化,最终获得探头安装位置对流量测量的影响规律以及产生的测量误差。两个安装位置相比,探头全伸比全缩测量效果更好,即推荐探头全伸为超声流量计探头最佳安装位置。
An existing problem in the dry calibration method for the ultrasonic flowmeter is the effect of installation position of ultrasonic probe on the flow measurement.In order to solve this problem,a numerical simulation method based on computational fluid dynamics is proposed.Firstly,experiments are carried out to study the quantitative effect of ultrasonic flowmeter probe position on measurement.And the simulation model is created and optimized based on experiment results.Secondly,two typical installations—protrusion and recess— are discussed respectively.Through analyzing the flow mechanism of flow field,the velocity distribution along each acoustic path,and the variation of flow field at the probe,the effect law of probe installation position on the flow measurement and the produced measurement errors are obtained.Comparison between the two installation positions shows that the probe protrusion achieves a better measurement result,so it is recommended as an optimal installation position.
出处
《机械工程学报》
EI
CAS
CSCD
北大核心
2011年第12期13-18,共6页
Journal of Mechanical Engineering
基金
天津大学自主创新基金资助项目
关键词
超声流量计
数值仿真
超声探头
非实流标定
Ultrasonic flowmeter Numerical simulation Ultrasonic probe Dry calibration
