等容燃烧室法测定柴油衍生十六烷值

为验证等容燃烧室法的准确度和精密度,测定了三种标准燃料的衍生十六烷值。采用等容燃烧室法和标准发动机法测定出厂柴油和成品柴油的衍生十六烷值,基于Bland-Altman方法进行一致性评价。结果表明:等容燃烧室法测定三种标准燃料衍生十六烷值的平均相对误差为-1.31%~1.72%,相对标准偏差为0.33%~1.32%;出厂柴油两种方法测定差值均值为0.02,标准偏差为0.54,一致性界限内单次测定差值最大值为0.9;成品柴油两种方法测定差值均值为0.14,标准偏差为0.57,一致性界限内单次测定差值最大值为0.9。

Determination of diesel fuel derivative cetane number by constant volume combustion chamber

Derivative cetane number of three standard fuels was determined to verify the accuracy and precision of the constant volume combustion chamber method.The derivative cetane number of refinery diesel and refined diesel was determined by constant volume combustion chamber and standard motor methods,which was also called compression ratio method(CFR).The consistency of the results was evaluated by Bland-Altman method.The results showed that the mean relative error of constant volume combustion chamber method was-1.31%~1.72%,and the relative standard deviation was 0.33%~1.32%.The mean difference of refinery diesel between the above two methods was 0.02,and the standard deviation was 0.54.The maximum value of the single measurement difference within the consistency limit was 0.9.For the finished diesel,the mean difference between two methods was 0.14,and the standard deviation was 0.57.The maximum value of the single measurement difference within the consistency limit was also 0.9.