The long time challenge for diesel engine manufacturers has been to reduce both particulate matter (PM) and NOX emissionssimultaneously. One technique for reducing PM has been to inject air or oxygen-enriched air directly into the combustionchamber. Previous computational studies using the KIVA-3 computational fluid dynamics (CFD) model at the University ofWisconsin have shown benefits and the importance of the gas injection characteristics on the technique’s effectiveness inreducing emissions.Using a Caterpillar 3401E single cylinder engine, experimental studies have been conducted to demonstrate the effectivenessof an oxygen enriched gas injection system in reducing the size and number of particulates. The experimental results weresimilar to those of the computational fluid dynamics KIVA-3 model. A simultaneous reduction of NOX and particulates weredemonstrated when the fuel injection characteristics were optimized in conjunction with the air injection. The experimentalPM emissions were analyzed for number and size distributions and found to be consistent with previously reported trends.
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