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A Comparison of Several Methods of Measuring Ignition Lag in a Compression-ignition EngineThe ignition lag of a fuel oil in the combustion chamber of a high speed compression-ignition engine was measured by three different methods. The start of injection of the fuel as observed with a Stoborama was taken as the start of the period of ignition lag in all cases. The end of the period of ignition lag was determined by observation of the appearance of incandescence in the combustion chamber, by inspection of a pressure-time card for evidence of pressure rise, and by analysis of the indicator card for evidence of the combustion of a small but definite quantity of fuel. A comparison of the values for ignition lags obtained by these three methods indicates that the appearance of incandescence is later than other evidences of the start of combustion, that visual inspection of a pressure-time diagram gives consistent and usable values with a minimum requirement of time and/or apparatus, and that analysis of the indicator card is not worth while for ignition lag alone.
Document ID
19930081397
Acquisition Source
Legacy CDMS
Document Type
Other
Authors
Spanogle, J A
Date Acquired
September 6, 2013
Publication Date
January 1, 1934
Report/Patent Number
NACA-TN-485
Accession Number
93R10687
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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