1、Designation: D613 10a1Designation: 41/2000Standard Test Method forCetane Number of Diesel Fuel Oil1This standard is issued under the fixed designation D613; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revision, the year of last revision.
2、 A number 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 Department of Defense.1NOTEEditorial changes were made to subsection 8.3 in August 20
3、13.1. Scope*1.1 This test method covers the determination of the ratingof diesel fuel oil in terms of an arbitrary scale of cetanenumbers using a standard single cylinder, four-stroke cycle,variable compression ratio, indirect injected diesel engine.1.2 The cetane number scale covers the range from
4、zero (0)to 100, but typical testing is in the range of 30 to 65 cetanenumber.1.3 The values for operating conditions are stated in SI unitsand are to be regarded as the standard. The values given inparentheses are the historical inch-pound units for informationonly. In addition, the engine measureme
5、nts continue to be ininch-pound units because of the extensive and expensivetooling that has been created for these units.1.4 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 establish appro-
6、priate safety and health practices and determine the applica-bility of regulatory limitations prior to use. For more specificwarning statements, see Annex A1.2. Referenced Documents2.1 ASTM Standards:2D975 Specification for Diesel Fuel OilsD1193 Specification for Reagent WaterD2500 Test Method for C
7、loud Point of Petroleum ProductsD4057 Practice for Manual Sampling of Petroleum andPetroleum ProductsD4175 Terminology Relating to Petroleum, PetroleumProducts, and LubricantsD4177 Practice for Automatic Sampling of Petroleum andPetroleum ProductsE456 Terminology Relating to Quality and StatisticsE5
8、42 Practice for Calibration of Laboratory VolumetricApparatusE832 Specification for Laboratory Filter Papers3. Terminology3.1 Definitions:3.1.1 accepted reference value (ARV), na value that servesas an agreed-upon reference for comparison, and which isderived as: (1) a theoretical or established val
9、ue, based onscientific principles, or (2) an assigned or certified value, basedon experimental work of some national or internationalorganization, or (3) a consensus or certified value, based oncollaborative experimental work under the auspices of ascientific or engineering group. E4563.1.1.1 Discus
10、sionIn the context of this test method,accepted reference value is understood to apply to the cetanenumber of specific reference materials determined empiricallyunder reproducibility conditions by the National ExchangeGroup or another recognized exchange testing organization.3.1.2 cetane number (CN)
11、, na measure of the ignitionperformance of a diesel fuel oil obtained by comparing it toreference fuels in a standardized engine test. D41753.1.2.1 DiscussionIn the context of this test method,ignition performance is understood to mean the ignition delayof the fuel as determined in a standard test e
12、ngine undercontrolled conditions of fuel flow rate, injection timing andcompression ratio.3.1.3 compression ratio (CR), nthe ratio of the volume ofthe combustion chamber including the precombustion chamberwith the piston at bottom dead center to the comparable volumewith the piston at top dead cente
13、r.3.1.4 ignition delay, nthat period of time, expressed indegrees of crank angle rotation, between the start of fuelinjection and the start of combustion.1This test method is under the jurisdiction of ASTM Committee D02 onPetroleum Products and Lubricants and is the direct responsibility of Subcommi
14、tteeD02.01 on Combustion Characteristics.Current edition approved Oct. 1, 2010. Published November 2010. Originallyapproved in 1941. Last previous edition approved in 2010 as D61310. DOI:10.1520/D0613-10AE01.2For referenced ASTM standards, visit the ASTM website, www.astm.org, orcontact ASTM Custome
15、r Service at serviceastm.org. For Annual Book of ASTMStandards 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
16、19428-2959. United States13.1.5 injection timing (injection advance), nthat time inthe combustion cycle, measured in degrees of crank angle, atwhich fuel injection into the combustion chamber is initiated.3.1.6 repeatability conditions, nconditions where inde-pendent test results are obtained with t
17、he same method onidentical test items in the same laboratory by the same operatorusing the same equipment within short intervals of time. E4563.1.6.1 DiscussionIn the context of this test method, ashort time interval between two ratings on a sample fuel isunderstood to be not less than the time to o
18、btain at least onerating on another sample fuel between them but not so long asto permit any significant change in the sample fuel, testequipment, or environment.3.1.7 reproducibility conditions, nconditions where testresults are obtained with the same method on identical testitems in different labo
19、ratories with different operators usingdifferent equipment. E4563.2 Definitions of Terms Specific to This Standard:3.2.1 cetane meter (ignition delay meter), nthe electronicinstrument which displays injection advance and ignition delayderived from input pulses of multiple transducers (pickups).3.2.2
20、 Check Fuels, nfor quality control testing, a dieselfuel oil of selected characteristics having a cetane numberaccepted reference value determined by round-robin testingunder reproducibility conditions.3.2.3 combustion pickup, npressure transducer exposed tocylinder pressure to indicate the start of
21、 combustion.3.2.4 handwheel reading, nan arbitrary numerical value,related to compression ratio, obtained from a micrometer scalethat indicates the position of the variable compression plug inthe precombustion chamber of the engine.3.2.5 injector opening pressure, nthe fuel pressure thatovercomes th
22、e resistance of the spring which normally holdsthe nozzle pintle closed, and thus forces the pintle to lift andrelease an injection spray from the nozzle.3.2.6 injector pickup, ntransducer to detect motion of theinjector pintle, thereby indicating the beginning of injection.3.2.7 primary reference f
23、uels (PRF), nn-cetane, heptam-ethyl nonane (HMN) and volumetrically proportioned mixturesof these materials which now define the cetane number scale bythe relationship:Cetane Number 5 % n 2 cetane10.15 % HMN! (1)3.2.7.1 DiscussionIn the context of this test method, thearbitrary cetane number scale w
24、as originally defined as thevolume percent of n-cetane in a blend with alpha-methylnaphthalene (AMN) where n-cetane had an assignedvalue of 100 and AMN an assigned value of zero (0). A changefrom alpha-methylnaphthalene to heptamethylnonane as thelow cetane ingredient was made in 1962 to utilize a m
25、aterial ofbetter storage stability and availability. Heptamethylnonanewas determined to have a cetane number accepted referencevalue (CNARV) of 15 based on engine testing by the ASTMDiesel National Exchange Group, using blends of n-cetane andAMN as primary reference fuels.3.2.7.2 DiscussionIn the co
26、ntext of this test method, theDiesel National Exchange Group of Subcommittee D02.013iscomposed of petroleum industry, governmental, and indepen-dent laboratories. It conducts regular monthly exchange sampleanalyses to generate precision data for this engine test standardand determines the CNARVof re
27、ference materials used by alllaboratories.3.2.8 reference pickups, ntransducer(s) mounted over theflywheel of the engine, triggered by a flywheel indicator, usedto establish a top-dead-center (tdc) reference and a time basefor calibration of the ignition delay meter.3.2.9 secondary reference fuels (
28、SRF), nvolumetricallyproportioned blends of two selected, numbered, and pairedhydrocarbon mixtures designated T Fuel (high cetane) and UFuel (low cetane) that have been rated by the ASTM DieselNational Exchange Group using primary reference fuels todetermine a cetane number accepted reference value
29、for eachindividually and for various combinations of the two.3.3 Abbreviations:3.3.1 ABDCafter bottom dead center3.3.2 AMNalpha-methylnaphthalene3.3.3 ARVaccepted reference value3.3.4 ATDCafter top dead center3.3.5 BBDCbefore bottom dead center3.3.6 BTDCbefore top dead center3.3.7 CNcetane number3.3
30、.8 CRcompression ratio3.3.9 HMNheptamethyl nonane3.3.10 HRFhigh reference fuel3.3.11 HWhand wheel3.3.12 IATintake air temperature3.3.13 LRFlow reference fuel3.3.14 NEGNational Exchange Group3.3.15 PRFprimary reference fuels3.3.16 SRFsecondary reference fuels3.3.17 TDCtop dead center3.3.18 UVultravio
31、let4. Summary of Test Method4.1 The cetane number of a diesel fuel oil is determined bycomparing its combustion characteristics in a test engine withthose for blends of reference fuels of known cetane numberunder standard operating conditions. This is accomplishedusing the bracketing handwheel proce
32、dure which varies thecompression ratio (handwheel reading) for the sample and eachof two bracketing reference fuels to obtain a specific ignitiondelay permitting interpolation of cetane number in terms ofhandwheel reading.3Bylaws governing ASTM Subcommittee D02.01 on Combustion Characteris-tics are
33、available from the subcommittee or from ASTM International.D613 10a125. Significance and Use5.1 The cetane number provides a measure of the ignitioncharacteristics of diesel fuel oil in compression ignition en-gines.5.2 This test method is used by engine manufacturers,petroleum refiners and marketer
34、s, and in commerce as aprimary specification measurement related to matching of fuelsand engines.5.3 Cetane number is determined at constant speed in aprecombustion chamber type compression ignition test engine.The relationship of test engine performance to full scale,variable speed, variable load e
35、ngines is not completely under-stood.5.4 This test method may be used for unconventional fuelssuch as synthetics, vegetable oils, and the like. However, therelationship to the performance of such materials in full scaleengines is not completely understood.6. Interferences6.1 (WarningAvoid exposure o
36、f sample fuels and refer-ence fuels to sunlight or fluorescent lamp UV emissions tominimize induced chemical reactions that can affect cetanenumber ratings.)46.1.1 Exposure of these fuels to UV wavelengths shorterthan 550 nm for a short period of time may significantly affectcetane number ratings.6.
37、2 Certain gases and fumes present in the area where thecetane test engine is located may have a measurable effect onthe cetane number test result.6.3 This test method is not suitable for rating diesel fuel oilswith fluid properties that interfere with unimpeded gravity flowof fuel to the fuel pump o
38、r delivery through the injector nozzle.7. Apparatus7.1 Engine Equipment5,6This test method uses a singlecylinder engine which consists of a standard crankcase withfuel pump assembly, a cylinder with separate head assembly ofthe precombustion type, thermal syphon recirculating jacketcoolant system, m
39、ultiple fuel tank system with selectorvalving, injector assembly with specific injector nozzle, elec-trical controls, and a suitable exhaust pipe. The engine is beltconnected to a special electric power-absorption motor whichacts as a motor driver to start the engine and as a means toabsorb power at
40、 constant speed when combustion is occurring(engine firing). See Fig. 1 and Table 1.7.2 Instrumentation5,6This test method uses an electronicinstrument to measure injection and ignition delay timing aswell as conventional thermometry, gages and general purposemeters.7.2.1 Cetane Meter, (Ignition Del
41、ay Meter) is critical andshall be used for this test method.7.3 Reference Fuel Dispensing EquipmentThis testmethod requires repeated blending of two secondary referencefuel materials in volumetric proportions on an as-needed basis.Measurement shall be performed accurately because ratingerror is prop
42、ortional to blending error.7.3.1 Volumetric Blending of Reference FuelsVolumetricblending has historically been employed to prepare the re-quired blends of reference fuels. For volumetric blending, a setof two burets or accurate volumetric ware shall be used and thedesired batch quantity shall be co
43、llected in an appropriatecontainer and thoroughly mixed before being introduced to theengine fuel system.7.3.1.1 Calibrated burets or volumetric ware having a ca-pacity of 400 or 500 mL and a maximum volumetric toleranceof 60.2 % shall be used. Calibration shall be verified inaccordance with Practic
44、e E542.7.3.1.2 Calibrated burets shall be outfitted with a dispensingvalve and delivery tip to accurately control dispensed volume.The delivery tip shall be of such size and design that shutoff tipdischarge does not exceed 0.5 mL.7.3.1.3 The rate of delivery from the dispensing systemshall not excee
45、d 500 mL per 60 s.7.3.1.4 The set of burets for the reference and standardiza-tion fuels shall be installed in such a manner and be suppliedwith fluids such that all components of each batch or blend aredispensed at the same temperature.7.3.1.5 See Appendix X1, Volumetric Reference FuelBlending Appa
46、ratus and Procedures, for typical dispensingsystem information.7.3.2 Gravimetric Blending of Reference FuelsUse ofblending systems that allow preparation of the volumetrically-defined blends by gravimetric (mass) measurements based onthe density of the individual components is also permitted,provide
47、d the system meets the requirement for maximum0.2 % blending tolerance limits.7.3.2.1 Calculate the mass equivalents of thevolumetrically-defined blend components from the densities ofthe individual components at 15.56C (60F).7.4 Auxiliary Apparatus:7.4.1 Injector Nozzle TesterThe injector nozzle as
48、semblyshall be checked whenever the injector nozzle is removed andreassembled to ensure the initial pressure at which fuel isdischarged from the nozzle is properly set. It is also importantto inspect the type of spray pattern. Commercial injector nozzletesters which include a lever-operated pressure
49、 cylinder, fuelreservoir and pressure gauge are available from several sourcesas common diesel engine maintenance equipment.7.4.2 Special Maintenance ToolsA number of specialtytools and measuring instruments should be utilized for easy,convenient and effective maintenance of the engine and testingequipment. Lists and descriptions of these tools and instru-ments are available from the manufacturers of the engine4Supporting data have been filed at ASTM International Headquarters and maybe obtained by requesting Research Report RR:D0
