偏离泊肃叶方程式假设条件引起的石油产品运动粘度测定误差分析及对策

Analysis on Calculation Error of Kinematic Viscosity of Petroleum Products Caused by Deviation from Presupposition of Poiseuille Equation and Its Countermeasure

石油产品的质量事关国计民生,其中运动粘度是石油产品质量控制的一项核心指标,其测定必须严格按照GB/T265-88进行,如果实际操作中若偏离GB/T265-88则等同偏离了粘度测定的理论依据即泊肃叶方程式成立的假设条件,将会相应增加测试相对误差,从而影响测试结果的可靠性,直至使其可靠度达不到95%的置信水平.本文从泊肃叶方程式成立的假设条件入手、就各种偏离泊肃叶方程式成立的假设条件的行为进行比照实验,对影响测试结果可靠性(置信水平)的程度进行了系统分析论述并提出了纠正对策.

The quality of petroleum products is closely related to the national economy,and the people＇s livelihood and the kinematic viscosity of petroleum products is a key index of quality control.Its calculation must be strictly done according to GB/T265-88.In practical operation,the deviation from GB/T265-88 means the deviation from presupposition of Poiseuille equation,which may result in the relative error of calculation and affect the reliability of results.As a result,the reliability cannot reach the confidence level 95%.Based on the presupposition of Poiseuille equation establishment,various deviations are compared in the experiments and the degree of reliability（confidence level） is discussed systematically.Finally the correcting countermeasures are proposed.