Servicio de Información Comunitario sobre Investigación y Desarrollo - CORDIS

CFD software capable of simulating heat transfer with particular emphasis on near wall-effects such as fuel jet impingement and possible soot layer buildup

The result will be an extension to the commercially available CFD code STAR-CD and possibly to other in-house CFD codes such as MERMAID, an extremely accurate and fast coupled finite-element CFD solver designed primarily for model evaluation. The result will enable us to compute in-cylinder effects that are generally not possible to accurately compute with CFD codes today, such as transient near-wall behaviour, effects of soot buildup and fuel-jet impingement on the wall, and heat transfer in boundary layers with very strong density gradients.

The balance between fuel consumption and emission formation in diesel engines is currently and even more so in the future very delicate. Often very high injection pressures are needed to keep the soot formation at a low level, whereas NOx-reducing measures, such as Exhaust Gas Recirculation will increase soot formation and fuel consumption. Higher injection pressures will, in turn, increase the heat transfer to the piston. This will in itself affect NOx-formation and fuel efficiency. In addition it will make pistons vulnerable to temperature variation fatigue and thermal wear.

To take all these effects into account it is very important that the submodel for each process is as valid and accurate as possible, otherwise this delicate balance will not be predicted.

The result has the potential to be used to discover the potential of reducing NOx with known measures while at the same time avoid thermal wear on pistons and taking the isolating effects on soot layers on pistons into account. The plan is to use it as an everyday tool to guide in the design of pistons and combustion concepts.

The end user of this result is typically an engineer in the field of computational analysis or combustion concept or piston design. The outcome of use of the result is in the end a more economical and environmentally friendly Diesel engine with impact on a vast amount of people.

Potential problems using this the method or the result could be the uncertainty of determining the deposit buildup on the piston. A parameter, which, although included in the model, is very hard to guess or predict.

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Reported by

Volvo Technology Corporation
Sven Hultins Gata 9
412 88 Göteborg
Sweden
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