Correlation of Knock with Engine Parameters for Ammonia/Nitrous Oxide Mixtures

Paper #:
  • 912310

Published:
  • 1991-10-01
Citation:
Dhall, 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.
Pages:
15
Abstract:
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.
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