摘要
为了减小气流对磁动式测氧仪的影响,提高仪器的性能。运用流体力学理论,从气流对哑铃球的冲击、测量池内气体密度随流量变化和气体流速引起二小球不对称升力3个方面,分析了气体流量对仪器的影响。推导出测量池内气体压强、密度和体积磁化率与气体流量的关系式。提出安装紊流丝网,对哑铃球系统基架开分流孔,采用镀膜刻蚀实现转动阻尼等改进措施。实验表明,所采取的改进措施能有效地改善仪器读数随流量增大的问题,并提高了较大流量(0.5 L/min)时仪器读数的稳定性。
In order to diminish the effect of gas flow on magnetomotive oxygen detector and improve the detector＇ s performance, the theory of fluid mechanics is utilized in this paper. From three aspects which are the impact of gas flow on dumbbell ball, the change of gas-flow rate with density of gas in measuring cell, the velocity of gas-flow re-suiting in asymmetry lift of two balls, and the effect of gas-flow rate on detector are analyzed. In measuring cell the relation between pressure, density, and volume magnetic susceptibility and gas-flow rate is deduced. The silk net of turbulence, which is mentioned, is installed. Opening and dividing flow hole for the system pedestal of dumbbell ball, the measure of metallic-membrane plating and corrosion to achieve rotary damping and other improvement measures are adopted. The experimental results show that the improvement measures can effectively improve the problem of detector which is the reading swelling with flow rate and improve the stability of detector＇ reading as wi-der flow rate.
出处
《电子测量与仪器学报》
CSCD
2013年第12期1181-1187,共7页
Journal of Electronic Measurement and Instrumentation
基金
国家自然科学基金(11102100)资助项目
关键词
磁动式
测氧仪
气体流量
流速
压强
magnetomotive
oxygen-detector
gas-flow rate
velocity of flow
pressure
