Self-ignition of diesel spray combustion |
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Authors: | Isares Dhuchakallaya A P Watkins |
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Institution: | (1) Energy, Environment and Climate Change Research Group, School of Mechanical, Aerospace and Civil Engineering, University of Manchester, Manchester, UK |
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Abstract: | This work presents the development and implementation of auto-ignition modelling for DI diesel engines by using the probability
density function-eddy break-up (PDF-EBU) model. The key concept of this approach is to combine the chemical reaction rate
dealing with low-temperature mode, and the turbulence reaction rate governing the high-temperature part by a reaction progress
variable coupling function which represents the level of reaction. The average reaction rate here is evaluated by a PDF averaging
approach. In order to assess the potential of this developed model, the well-known Shell ignition model is chosen to compare
in auto-ignition analysis. In comparison, the PDF-EBU ignition model yields the ignition delay time in good agreement with
the Shell ignition model prediction. However, the ignition kernel location predicted by the Shell model is slightly nearer
injector than that by the PDF-EBU model leading to shorter lift-off length. As a result, the PDF-EBU ignition model developed
here are fairly satisfactory in predicting the auto-ignition of diesel engines with the Shell ignition model. |
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