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In this work, the knowledge base concerning the formation of criteria air pollutants, formaldehyde, nitric oxide, and nitrogen dioxide in the precombustion chamber of a 4-stroke lean burn (4SLB) industrial engine gas is expanded. This paper focuses specifically on an analytical model which is capable of estimating mass flow between the precombustion chamber and main cylinder at specific instances during the engine cycle to assist in clarifying raw emission data obtained by sampling gas directly from an engine's precombustion chamber. The model was developed to determine the origin of the mass sampled from the precombustion chamber which, in turn, delivers weight factors used to correct the concentrations of criteria pollutants, formaldehyde, nitric oxide, and nitrogen dioxide measured from the precombustion chamber. The corrected constituent concentrations then allow for a comparison between emissions formed in the precombustion chamber to that of the engine overall on a mass basis. The NO formed in the precombustion chamber is a minor contributor to engine-out NO emissions (less than 10%) for nominal operating conditions and a major contributor at the lean limit (about 75%). The analysis also provides a calculation to generalize the results by determining the equivalence ratio in the precombustion chamber and the corresponding emissions. Equivalence ratios evaluated in the precombustion chamber are between 1.1 and 1.6.
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