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The corresponding fuel/air equivalence ratio is given by
It was assumed that soot was present in stoichiometric combustion products at selected times in the cycle and that mixing with air leaned out the burned gas mixture at different rates until the overall fuel/air equivalence ratio was reached.
Equation (11.41) shows a maximum recession rate in combustion products corresponding to a fuel/air equivalence ratio of about 0.9.
Spark-ignition engines usually operate at fuel/air equivalence ratios between about 0.9 and 1.2 (see Sec. 7.1).
Figure 11-2 shows concentrations of NO, CO, and HC in a spark-ignition engine exhaust as a function of fuel/air equivalence ratio.
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