Abstract
In this study, the effects of fuel injection discharge curve and injection pressure onpower upgrade of heavy-duty diesel engine by simulation of combustion process in AVL-Fire software are discussed simultaneously. Hence, the fuel injection discharge curve is changed from semi-triangular to rectangular which is usual in common rail fuel injection system. Injection pressure with respect to amount of injected fuel and nozzle hole diameter are changed. Injection pressure is calculated by an experimental equation which is developed for heavy duty diesel engines with common rail fuel injection system. Power upgrade for 1000 and 2000 bar injection pressures are discussed. For 1000 bar injection pressure with 188 mg injected fuel and 3 mm nozzle hole diameter, power is upgraded about 19% in comparison to original state which is semi-triangular discharge curve with 139 mg injected fuel and 3 mm nozzle hole diameter, with no special change in cylinder pressure. On the other hand, both the NOX and the Soot emissions decreased about 30 and 6%, respectively. Compared with the original state, in the case of 2000 bar injection pressure, with injected fuel and nozzle diameter, 196 mg and 2.6 mm respectively, the power is upgraded about 22%, whereas cylinder pressure has been fixed, and the NOX and the Soot emissions are decreased to 36 and 20%, respectively. Key words: Computational fluid dynamics (CFD) simulation, heavy-duty (HD) diesel engine, upgrading power, injection pressure, fuel injection discharge curve, combustion process.
Highlights
Power upgrade of internal combustion engines is a quantitative feature
The results show that by increasing injection pressure, output power of diesel engine increases
Fuel injection discharge curve for 1000 and bar injection pressures are shown in Figures 5 and
Summary
Power upgrade of internal combustion engines is a quantitative feature. Many methods are used in this field. All of the methods which are used consider fuel and air inlet in combustion chamber. By increasing each one of these two parameters (fuel and input air) and by changing the strategies in fuel injection and air intake systems, power upgrade is possible. Many parameters of fuel injection and air intake systems have effect on combustion parameters and output power of engine.
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