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Correlation of Knock with Engine Parameters for Ammonia/Nitrous Oxide Mixtures
ISSN: 0148-7191, e-ISSN: 2688-3627
Published October 01, 1991 by SAE International in United States
Annotation ability available
The knock characteristics of Ammonia/Nitrous Oxide mixtures in a CFR engine were determined as a function of equivalence ratio and compression ratio. The engine speed and ignition timing were constant at 900 rpm and 13° BTDC, respectively. The gas mixture entered the engine at room conditions. Knock was sensed from measurements of cylinder pressure using a piezoelectric transducer.
The intensity of knock was assessed in terms of the third derivative of cylinder pressure with crank angle, which was determined from a computer analysis of the measured signal. In terms of knock intensity, Kl, the data indicates that for normal combustion, Kl < 3 kPa/CA3; for incipient knock, Kl = 3 to 5 kPa/CA3 and for audible knock, Kl > 6 kPa/CA3.
The knock intensity was normalized in terms of a pressure that is related to energy release per unit volume. A correlation was obtained between the normalized knock function and the equivalence and compression ratios. All data fell within 20% of the correlation equation.
CitationDhall, S. and Beans, E., "Correlation of Knock with Engine Parameters for Ammonia/Nitrous Oxide Mixtures," SAE Technical Paper 912310, 1991, https://doi.org/10.4271/912310.
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