Abstract
In this work, NISSAN Z24 engine was simulated numerically and valves and ignition timings were modified in order to improve the engine performance and emissions. The engine was simulated using a version of the Los Alamos code KIVA-3V2 which is a computer program for the numerical calculation of transient, two and three dimensional chemically reactive flows with sprays. The computational grid was generated by the commercial software, ANSYS ICEM CFD. To validate the code, a comparison between experimental and theoretical results has been made, which confirm good qualitative agreement between these results. A series of parametric studied is performed to gain a better understanding of the effects of valves and ignition timings on the engine performance and emission. The results show that the engine volumetric efficiency, output power, emissions and performance are well improved by applying the optimal values. Key words: Spark ignition (SI) engine, valves and ignition timings, engine performance and emissions.
Highlights
Nowadays, due to government server rules on environmental standards and fuel consumption, car manufacturers are under pressure to reduce regulated emissions and fuel consumption
The results show that the engine volumetric efficiency, output power, emissions and performance are well improved by applying the optimal values
Shayler (2007) investigated the effect of valve timing on the amount of burned gas that remains from pervious cycle in the combustion chamber
Summary
Numerical investigation on the effect of different parameters on the performance and the emission of a spark ignition (SI) engine. NISSAN Z24 engine was simulated numerically and valves and ignition timings were modified in order to improve the engine performance and emissions. The engine was simulated using a version of the Los Alamos code KIVA-3V2 which is a computer program for the numerical calculation of transient, two and three dimensional chemically reactive flows with sprays. A series of parametric studied is performed to gain a better understanding of the effects of valves and ignition timings on the engine performance and emission. The results show that the engine volumetric efficiency, output power, emissions and performance are well improved by applying the optimal values
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