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Multi-dimensional simulation of flow, combustion and emissions in diesel engines
Diesel engine designers are faced with increasingly stringent social demands for reduced emissions
while maintaining high efficiency. A number of strategies are being contemplated, among which are the use of increased injection pressures and
retarded injection timings, introducing more cool air into the combustion chamber through turbocharging and intercooling, and exhaust after-treatment.
However, the trade-off nature in NOx, soot and fuel economy makes it difficult to improve them simultaneously. There is an urgent need to understand the processes leading to the
formation of these emissions and explore innovative strategies to control them.
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 In recent years, multidimensional modeling of the Diesel
engine in-cylinder processes is becoming a promising alternative. Among many CFD packages, the KIVA code developed at Los Alamos National laboratory is the best
known engine simulation tool. Although KIVA has an efficient numerical structure, its built-in physical submodels for spray, combustion or emissions, etc. are
rather elementary and hence inadequate for practical use. The pre- and post-processing capabilities are also limited. Further, since there is no technical support available for
the public domain version of the KIVA code, the user requires substantial initial effort, in-depth knowledge in CFD and combustion modeling, and sufficient familiarity
with the code and programming.
As a better alternative, Innovative Research is offering consulting services for Diesel engine computation based
on an enhanced version of KIVA, called IR-Kiva. IR-Kiva has a complete set of models for Diesel engine combustion and emissions analysis. It includes a number of
advanced submodels such as the spray model, the auto-ignition model, the high temperature combustion model and the emissions (soot, NOx, etc.) model. These
submodels have been shown to be adequate when used to predict the engine performance.
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 Our engineers have broad engineering experience with
leading Diesel engine manufacturers. As a result, we have successfully carried out a number of engine computations including simulating the effects of turbocharging, fuel
injection optimization (pressure, timing, rate shaping, split injection, etc.), combustion chamber geometry modifications, intake/exhaust port flow, and EGR. We
emphasize comparisons between computational results and experimental measurements. Our predictions of cylinder pressure, soot and NOx have accuracy of as high as 95%.
In addition, our highly trained CFD engineers ensure quick and reliable customization and any addition of features. At Innovative Research, we provide superior technical support
so that our clients can get started with a complex engine simulation package easily and smoothly.
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