1、Designation:D269921Standard Test Method forResearch Octane Number of Spark-Ignition Engine Fuel1This standard is issued under the fixed designation D2699;the number immediately following the designation indicates the year oforiginal adoption or,in the case of revision,the year of last revision.A num
2、ber in parentheses indicates the year of last reapproval.Asuperscript epsilon()indicates an editorial change since the last revision or reapproval.This standard has been approved for use by agencies of the U.S.Department of Defense.1.Scope*1.1 This laboratory test method covers the quantitativedeter
3、mination of the knock rating of liquid spark-ignitionengine fuel in terms of Research O.N.,including fuels thatcontain up to 25%v/v of ethanol.However,this test methodmay not be applicable to fuel and fuel components that areprimarily oxygenates.2The sample fuel is tested using astandardized single
4、cylinder,four-stroke cycle,variable com-pression ratio,carbureted,CFR engine run in accordance witha defined set of operating conditions.The O.N.scale is definedby the volumetric composition of PRF blends.The sample fuelknock intensity is compared to that of one or more PRF blends.The O.N.of the PRF
5、 blend that matches the K.I.of the samplefuel establishes the Research O.N.1.2 The O.N.scale covers the range from 0 to 120 octanenumber but this test method has a working range from 40 to120 Research O.N.Typical commercial fuels produced forspark-ignition engines rate in the 88 to 101 Research O.N.
6、range.Testing of gasoline blend stocks or other process streammaterials can produce ratings at various levels throughout theResearch O.N.range.1.3 The values of operating conditions are stated in SI unitsand are considered standard.The values in parentheses are thehistorical inch-pound units.The sta
7、ndardized CFR enginemeasurements continue to be in inch-pound units only becauseof the extensive and expensive tooling that has been created forthis equipment.1.4 For purposes of determining conformance with allspecified limits in this standard,an observed value or acalculated value shall be rounded
8、“to the nearest unit”in thelast right-hand digit used in expressing the specified limit,inaccordance with the rounding method of Practice E29.1.5 This standard does not purport to address all of thesafety concerns,if any,associated with its use.It is theresponsibility of the user of this standard to
9、 establish appro-priate safety,health,and environmental practices and deter-mine the applicability of regulatory limitations prior to use.For specific warning statements,see Section 8,14.4.1,15.5.1,16.6.1,Annex A1,A2.2.3.1,A2.2.3.3(6)and(9),A2.3.5,X3.3.7,X4.2.3.1,X4.3.4.1,X4.3.9.3,X4.3.11.4,and X4.5
10、.1.8.1.6 This international standard was developed in accor-dance with internationally recognized principles on standard-ization established in the Decision on Principles for theDevelopment of International Standards,Guides and Recom-mendations issued by the World Trade Organization TechnicalBarrier
11、s to Trade(TBT)Committee.2.Referenced Documents2.1 ASTM Standards:3D1193 Specification for Reagent WaterD2268 Test Method for Analysis of High-Purity n-Heptaneand Isooctane by Capillary Gas ChromatographyD2700 Test Method for Motor Octane Number of Spark-Ignition Engine FuelD2885 Test Method for Det
12、ermination of Octane Number ofSpark-Ignition Engine Fuels by On-Line Direct Compari-son TechniqueD3703 Test Method for Hydroperoxide Number of AviationTurbine Fuels,Gasoline and Diesel FuelsD4057 Practice for Manual Sampling of Petroleum andPetroleum ProductsD4175 Terminology Relating to Petroleum P
13、roducts,LiquidFuels,and LubricantsD4177 Practice for Automatic Sampling of Petroleum andPetroleum ProductsD4814 Specification for Automotive Spark-Ignition EngineFuelD5842 Practice for Sampling and Handling of Fuels forVolatility Measurement1This test method is under the jurisdiction of ASTM Committ
14、ee D02 onPetroleum Products,Liquid Fuels,and Lubricants and is the direct responsibility ofSubcommittee D02.01 on Combustion Characteristics.Current edition approved Dec.1,2021.Published December 2021.Originallyapproved in 1968.Last previous edition approved in 2019 as D2699 191.DOI:10.1520/D2699-21
15、.2Motor O.N.,determined using Test Method D2700,is a companion method toprovide a similar but typically lower octane rating under more severe operatingconditions.3For referenced ASTM standards,visit the ASTM website,www.astm.org,orcontact ASTM Customer Service at serviceastm.org.For Annual Book of A
16、STMStandards volume information,refer to the standards Document Summary page onthe ASTM website.*A Summary of Changes section appears at the end of this standardCopyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United StatesThis international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for theDevelopment of International Standards,Guides and Recommendation
