Understanding and Modeling NO Emissions from Adopting Variable Composition Air Diesel Engine

The article researches the performance of the diesel engine adopting variable composition air using numerical simulation and experimental methods. The mechanism of NO formation has been validated. At the same time the experiment and numerical simulation show that it is useful to lessen the diesel NO emission owing to adopting NEA (nitrogen-enriched air) technology and nitrogen concentration need not be too high, which is 80%, the emission of NO is decreased prominently, but the power performance and fuel economy of the diesel engine descends and the engine-out emissions :CO and PM emissions increase; On the other hand the emissions :CO and PM emissions descends and the power performance and fuel economy of the diesel engine increases, but NO emission increases owing to adopting OEA (Oxygen-enriched air). So it is necessary to adopt optimizing measurement to gain better effect according to working condition.