风量法测定柴油十六烷值不确定度的评估

Evaluation of Uncertainty in Measurement of Cetane Number of Diesel Fuel by Air Volume Method

依据《GB/T 33298-2016柴油十六烷值的测定风量调节法》,采用专用十六烷值机,通过调节风量测定,在准确测定柴油十六烷值的基础上,分析测定过程中样品重复测量引入的标准不确定度和副标准燃料配置过程中引入的不确定度,耦合成为总标准不确定度。简要介绍了风量法测定柴油十六烷值的实验流程、实验条件、主要方法、十六烷值的测定不确定度的来源和计算模型,对测定过程引入的不确定度分量来源进行了分析、计算和评估,得到风量法测定柴油十六烷值结果为54.67。扩展不确定度为0.44。对采用风量法测定柴油十六烷值不确定度实验提出了相关注意事项。

According to “Standard test method for determining cetane number of diesel fuel:Airflow regulation(GB/T 33298—2016)”,using a special cetane number machine with airflow regulation,on the basis of accurately measuring the cetane number of diesel fuel,the standard uncertainty introduced in the repeated measurement of samples and the uncertainty introduced in the sub standard fuel configuration are analyzed and coupled into the total standard uncertainty.The experimental process,experimental conditions,main methods,sources and calculation models of uncertainty in the determination of cetane number of diesel fuel by airflow method are briefly introduced.The sources of uncertainty components introduced in the determination process are analyzed,calculated and evaluated,and the result of the determination of cetane number of diesel fuel by airflow method is 54.67 with the expanded uncertainty of 0.44.Some points for attention in the uncertainty experiment of diesel cetane number determination by airflow method are put forward.