Abstract
In premixed compression ignition engines, NOx emission is reduced remarkably under partial load conditions but the engines cannot work under high load conditions. For improving such a defect, a MULDIC (Multiple Stage Diesel Combustion) concept was proposed by New ACE Institute. In a MULDIC engine, the premixed combustion at the first stage and the diffusion combustion at the second stage have to be optimized to realize high output with low NOx emission. In this study, the combustion processes under various injection conditions in a MULDIC engine were numerically analyzed using the authors' GTT code with Schreiber's five-step reduced kinetic model. As a result, the heat release rate and the tendency of NOx emission were predicted reasonably.
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