A study of the high speed diesel engine exhaust with respect to gas composition and smoke density
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Abstract
A study of exhaust gas composition at various engine speeds, loads, and cooling water temperatures was made on an International Harvester UD-6 Diesel Engine. Simultaneously, smoke density was measured with a smokemeter, the principle of which was based on the obstruction of light. Exhaust gases were analyzed with a Fisher Precision Gas Analyzer. The components analyzed were carbon dioxide, oxygen, illuminants, carbon monoxide, hydrogen, and methane. The results of this study have led the investigators to the following conclusions.
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The exhaust gas composition was chiefly a function of fuel-air ratio.
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The effect of cooling water temperature on exhaust gas composition was not conclusive over the range of temperature investigated. (120 to 160 degrees Fahrenheit)
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The so-called “chilling of direct oxidation reactions” were experienced at maximum brake horsepower check.
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Smoke density increased with an increase in fuel-air ratio at ratios above .04. The cooling temperature effect was negligible.
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There was a relationship between smoke density and free, or unburned carbon in the exhaust.
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A higher precision method of gas analysis would be required for any study of the mechanics of combustion inside the combustion chamber.