石油产品 用氢含量数据评定航空涡轮燃烧的净比能

[中文适用范围]： 本国际标准描述了使用氢含量数据估算航空涡轮燃料净比能的程序。 它不适用于纯碳氢化合物。 该方法纯粹是经验性的，并且仅适用于通过常规原油的正常精炼工艺衍生的液态烃燃料，其符合有限沸程和成分的飞机涡轮机和喷气发动机燃料的规范要求。 注 1：该方法旨在在无法通过实验确定净比能且无法方便地进行的情况下以及在估计值被认为满足规范和类似目的的情况下用作指南。 并不打算使用净比能的估计值来代替实验确定的值。 注 2：仅当燃料属于明确定义的类别且净比能与硫含量、氢含量和密度之间存在关系时，根据碳氢燃料的硫含量、氢含量和密度估算其净比能才是合理的。 是从此类代表性样品的精确实验测量中得出的。 即使在这一类别中，也必须认识到个别燃料的估计可能出现大量错误的可能性。 注 3：附件 A 中定义了本国际标准中用于建立相关性的燃料。 [外文原描述]： This International Standard describes a procedure for the estimation of the net specific energy of aviation turbine fuels using hydrogen content data. It is not applicable to pure hydrocarbons. The method is purely empirical and is applicable only to liquid hydrocarbon fuels derived by normal refining processes from conventional crude oil which conform to the requirements of specifications for aircraft turbine and jet engine fuels of limited boiling ranges and compositions. NOTE 1 The method is intended for use as a guide in cases where an experimental determination of net specific energy is not available and cannot be made conveniently, and where an estimate is considered satisfactory for specifications and similar purposes. It is not intended that estimated values of the net specific energy be used in place of experimentally determined values. NOTE 2 The estimation of the net specific energy of hydrocarbon fuel from its sulfur content, hydrogen content and density is justifiable only when the fuel belongs to a well-defined class for which a relationship between net specific energy and sulfur content, hydrogen content and density has been derived from accurate experimental measurements on representative samples of this class. Even in this class, the possibility that the estimates can be in error by large amounts for individual fuels must be recognized. NOTE 3 The fuels used to establish the correlation presented in this International Standard are defined in annex A.