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Prediction of Nitric Oxide Formation Using a Two-Zone Model in a DI Diesel Engine
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 Title & Authors
Prediction of Nitric Oxide Formation Using a Two-Zone Model in a DI Diesel Engine
Kim, Cheol-Hwan; Lee, Jin-Ho; Chun, Kwang-Min; Lee, Kyo-Seung;
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In this study, numerical calculation is carried out to investigate the influence of injection timing, fuel amount, intake concentration, and EGR on Nitric Oxide(NO) formation using a two-zone model in a diesel engine. Results can be summarized as follows. The NO formation is very sensitive to the burned gas temperature, so multi-zone model must be applied to combustion process to predict the burned gas temperature exactly. Since the burned gas temperature increases rapidly during the premixed combustion, most NO is formed within 20 crank angle degrees after ignition. As the injection timing is retarded, the combustion occurs later in the expansion process which causes the decrease of burned gas temperature and, as a result, NO formation decrease. The increase of fuel amount results in the increase of earlier formation of NO in the engine. As the intake concentration increases, the maximum pressure and burned gas temperature increase due to activate combustion. And, [O] mole fraction of equilibrium combustion products also increase. Therefore NO exponentially increases. If exhaust gas is recirculated, the burned gas temperature decreases which results in NO decrease. If exhaust gas is cooled, more NO can be decreased.
DI Diesel Engine;Two-Zone Model;Engine Cycle Simulation;Fuel Amount;Intake Concentration;Exhaust Gas Recirculation;Injection Timing;
 Cited by
직분식 디젤엔진에서 엔진 매개변수들이 NO 및 soot 배출에 미치는 영향에 대한 수치해석 연구,함윤영;전광민;

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