石油产品 - 柴油燃料点火质量的测定 - 十六烷发动机法

[中文适用范围]： 本文件使用标准单缸、四冲程循环、可变压缩比、间接喷射柴油发动机，根据十六烷值 (CN) 的任意范围建立了柴油燃油的等级。 CN 提供压燃式发动机中柴油点火特性的测量方法。 CN 是在预燃室式压燃试验发动机中以恒定速度测定的。 然而，测试发动机性能与全尺寸、变速和变负载发动机的关系尚不完全清楚。 本文件适用于从 0 CN 到 100 CN 的整个量程范围，但典型测试范围为 30 CN 到 65 CN。 CEN 于 2013 年执行的一项实验室间研究（10 个样品，范围为 52,4 CN 至 73,8 CN）[3] 证实，合成或加氢处理产生的石蜡柴油含有体积分数高达 7% 的脂肪酸甲酯（ FAME），可以通过该测试方法进行测试，并且精度与常规燃料相当。 该测试可用于非常规燃料，例如合成油或植物油。 然而，这些燃料的精度尚未确定，并且这些材料与全尺寸发动机性能的关系尚未完全了解。 具有干扰燃油重力流向燃油泵或通过喷射器喷嘴输送的流体特性的样品不适合通过此方法进行评级。 注：本文件以 SI 单位指定操作条件，但发动机测量以英寸-磅单位或华氏度指定，因为这些是设备制造中使用的历史单位，因此本文件中的一些参考文献包括这些单位和其他非 SI 单位在括号中。 [外文原描述]： This document establishes the rating of diesel fuel oil in terms of an arbitrary scale of cetane numbers (CNs) using a standard single cylinder, four-stroke cycle, variable compression ratio, indirect injected diesel engine. The CN provides a measure of the ignition characteristics of diesel fuel oil in compression ignition engines. The CN is determined at constant speed in a pre-combustion chamber-type compression ignition test engine. However, the relationship of test engine performance to full scale, variable speed and variable load engines is not completely understood. This document is applicable for the entire scale range from 0 CN to 100 CN but typical testing is in the range of 30 CN to 65 CN. An interlaboratory study executed by CEN in 2013 (10 samples in the range 52,4 CN to 73,8 CN) [ 3 ] confirmed that paraffinic diesel from synthesis or hydrotreatment, containing up to a volume fraction of 7 % fatty acid methyl ester (FAME), can be tested by this test method and that the precision is comparable to conventional fuels. This test can be used for unconventional fuels such as synthetics or vegetable oils. However, the precision for those fuels has not been established and the relationship to the performance of such materials in full-scale engines is not completely understood. Samples with fluid properties that interfere with the gravity flow of fuel to the fuel pump or delivery through the injector nozzle are not suitable for rating by this method. NOTE This document specifies operating conditions in SI units but engine measurements are specified in inch-pound units or Fahrenheit because these are the historical units used in the manufacture of the equipment, and thus some references in this document include these and other non-SI units in parenthesis.