Numerical Study on the Effect of Nozzle Geometry on the Small CRDI Engine Performance

• Journal title : Journal of ILASS-Korea
• Volume 20, Issue 4,  2015, pp.254-260
• Publisher : Institute for Liquid Atomization and Spray Systems-Korea
• DOI : 10.15435/JILASSKR.2015.20.4.254
Title & Authors
Numerical Study on the Effect of Nozzle Geometry on the Small CRDI Engine Performance
Min, Se Hun; Suh, Hyun Kyu;

Abstract
The objective of this study is to investigate the effect of multi-hole nozzle on the performance of small CRDI engine. Combustion and exhaust emission characteristics of engine were studied by using CFD simulation with ECFM-3Z combustion model. The conditions of simulation were varied with nozzle geometry, injection timing and injection quantity. In addition, the results were compared in terms of combustion pressure, rate of heat release, $\small{NO_x}$ and soot emissions. It was found that combustion pressure was increased when injection timing was advanced. The rate of heat release of 6 hole nozzle was higher than that of 12 hole nozzle since the quantity of fuel impinged at the bottom of piston rim was different under different injection timing conditions. In the case of $\small{NO_x}$ emission, 6 hole nozzle generated more $\small{NO_x}$ emission than 12 hole nozzle. On the other hand, in the case of soot emission, 12 hole nozzle showed higher value than 6 hole nozzle because injected fuel droplets from multi-hole nozzle were coalesced.
Keywords
Combustion pressure;Injection timing;Injection quantity;Multi-hole nozzle;Rate of heat release;Soot;
Language
Korean
Cited by
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