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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.
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.
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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