Uncertainty Analysis of Velocity Measurement in Low Pressure Flow Field
YANG Tie-niu1,2,ZOU Sheng1,2,WU Zong-yue1,2,ZHAO Lei-lei1,2,LU Dong-dong1,2,YANG Ya1,2
1.School of Mechanical and Electrical Engineering, Wuyi University, Jiangmen, Guangdong 529020, China
2.Jiangmen CAD/CAM Engineering and Technology Research and Development Center, Jiangmen, Guangdong 529020, China
Abstract：Laser Doppler velocimetry has been widely used in the field of flow measurement. Based on the experimental platform of vacuum airflow detection, a laser Doppler velocimeter was used to measure the gas-velocity of the vacuum chamber. In order to reduce the measurement error of the velocity measurement system, the source and evaluation of the measurement uncertainty of the vacuum chamber velocity were analyzed and explained. The relative standard uncertainty and the relative expansion uncertainty of the measurement of gas-velocity of the vacuum chamber are obtained. The results show that the uncertainty caused by LDV repetitive velocity measurement and air intake quantity estimation is relatively large, but the uncertainty caused by LDV system error and other factors are smaller. The results are of guiding significance to the measurement of flow velocity in the later stage of vacuum chamber.
［1］费业泰.误差理论与数据处理［M］. 7版. 北京:机械工业出版社, 2015.
［2］崔骊水,胡鹤鸣,李春辉. 基于激光多普勒测速仪的皮托管校准实验研究［J］. 计量学报, 2014,35(6): 603-606.
Cui L S,Hu H M,Li C H. Experimental Investigation to Calibrate Pitot-tube by Laser Doppler Anemometer［J］. Acta Metrologica Sinica,2014,35(6):603-606.
［3］金光,焦晶晶,吴晅.典型流场测速技术应用研究进展［J］.矿山机械,2015,43(12):10-15.
Jin G, Jiao J J,Wu X. Research progress on application of typical flow field velocimetry technology［J］. Mining & Processing Equipment,2015,43(12):10-15.
［4］国家质量技术监督局.JJF 1059-1999 测量不确定度评定与表示［S］. 1999.
［5］吕进,周文晖.激光多普勒测速仪标定系统不确定度研究的自动测量设计［J］.中国计量学院学报,2001,12(1):63-67.
Lv J,Zhou W H. Automatic measurement design for uncertainty study of laser Doppler velocimeter calibration system［J］. Journal of China University of Metrology,2001,12(01):63-67.
［6］王辉林,王迎春.双光束激光多普勒测速实验系统的不确定度分析［J］.计量学报,2013,34(1):31-35.
Wang H L,Wang Y C. Analysis of Uncertainty of Double Beam Laser Doppler Velocity Measurement System［J］. Acta Metrologica Sinica,2013,34(1):31-35.
［7］国家质量监督检验检疫总局.JJG 52-2013 弹性元件式一般压力表、压力真空表和真空表检定规程［S］. 2013.
［8］邹胜,杨铁牛,黄尊地,等.基于二维LDV低压流场速度测量的研究［J］.真空科学与技术学报,2018,38(3):169-175.
Zou S,Yang T N,Huang Z D, et al. Study on Velocity Measurement of Low Pressure Flow Field Based on Two-Dimensional LDV［J］. Chinese Journal of Vacuum Science and Technology,2018,38(3):169-175.
［9］李恩邦,李志平,李淳,等.湍流中示踪粒子跟随性的数值分析［J］.仪器仪表学报,2009,30(2):225-231.
Li E B,Li Z P,Li C, et al. Numerical analysis of following behaviors of particle tracers in turbulent［J］. Chinese Journal of Scientific Instrument,2009,30(2):225-231.
2019, Vol. 40 
