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A Repeatability Test on the CFR Cetane Engine
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Abstract
A test schedule was established to study the repeatability of a CFR cetane rating engine. The effects of the three manual settings (fuel consumption, injection advance, ignition delay) were analysed. Results show that these parameters influence the compression ratio determined by the standard procedure but do not affect the cetane rating itself significantly, within the scope of the study. Potential improving of the current isodelay method is likely to be found by means of analysis of other parameters like fuels, atmospheric conditions, engine speed and load, design, etc.
A linear relationship between engine compression readings and test parameters was established, allowing to quantify the link between cetane and ignition delay. Further testing at constant compression ratio showed that more precise measurements are needed to make the use of a variable delay method possible, but such procedure will always be disturbed by nonlinearities, especially at low cetane levels.
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Citation
Le Breton, M., "A Repeatability Test on the CFR Cetane Engine," SAE Technical Paper 841340, 1984, https://doi.org/10.4271/841340.Also In
References
- 1983 Annual Book of ASTM Standards - Section 5 05-04
- An Improved CFR Cetane Rating Method BURT R. TROTH K.A. Shell Research Ltd. SAE paper 680464
- New Cetane Data Reveal Surprises, Challenges UNZELMAN G.H. Ethyl Corp. Oil and Gas Journal Nov. 14 1983
- The effects of Diesel Fuel Properties and Engine Operating Conditions on Ignition Delay WONG C.L. STEERE DE Imperial Oil Ltd. SAE paper 821231