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Assessment and Optimisation of the Instrumentation Used for Cetane Tests on Diesel Fuels
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Abstract
This paper is concerned with the performance of the sensors and associated instrumentation used for the standard cetane tests for diesel fuels according to the ASTM D-613 procedure. The two primary sensors are replaced by modern units, and the analogue monitoring system is replaced by a digital one; the changes in the performance of the instrumentation system are then assessed.
It is shown that the main source of inaccuracy in the measurement of ignition delay (on which the cetane test is based) is cyclic instability in the start of combustion, and that the current instrumentation and monitoring methods do not cope well with this instability. Although some of the cyclic variation can be ascribed to the instrumentation system, a large part is contributed by variability in the fuel ignition and injection processes. Improvements to the instrumentation and monitoring systems are presented and assessed.
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Citation
Parsi, M., Ladommatos, N., and McGrath, N., "Assessment and Optimisation of the Instrumentation Used for Cetane Tests on Diesel Fuels," SAE Technical Paper 922269, 1992, https://doi.org/10.4271/922269.Also In
References
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- Sutton, D. L. “Investigation into Diesel Operation with Changing Fuel Property” SAE Paper No. 860222 1986
- Ladommatos, N Wood, B McGrath, N “A Critical Appraisal of the Ignition Delay Meter Used in Standard Diesel Fuel Cetane Tests” SAE Paper No. 890418 1989
- Henein, N. A. “Cetane Scale: Function, Problems and Possible Solutions” SAE Paper No. 870584 1987
- Needham, J. R. Doyle, D. M. “The combustion and Ignition Quality of Alternative Fuels in Light Duty Diesels”
- ASTM D-613 “Rating Diesel Fuels by the Cetane Method” 1963