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Chemkin 4.1.1 Chapter 2: Combustion in Gas-phase Processes The parameters used in the heat-transfer correlation are shown in Figure 2-28. Note that the parameters for heat-transfer correlation or Woschni correction must be given as a group. If any entry or parameter in the group is left blank, the entire group of parameters will be considered invalid and will be reset to their default values. Figure 2-28 C1_ IC Engine—Reactor Physical Property for HCCI Woschni Heat Loss model 2.4.1.3 Project Results After simulations of both projects are successfully completed, we can launch the CHEMKIN Post-Processor from the Run Model panel of one the projects. We can load the solutions from the other project by using the File > Open menu option. The experimental data are saved in text data files and can be imported via the File > Import menu option. © 2007 Reaction Design 52 RD0411-C20-000-001
Chapter 2: Combustion in Gas-phase Processes <strong>Tutorials</strong> <strong>Manual</strong> The temperature solutions are shown in Figure 2-29. We mentioned earlier, crank_rotation_angle = 0 is the TDC. We notice that the measured gas temperature before ignition is higher than the one predicted by the adiabatic model. If the measurement was done correctly, this could mean that a small portion of fuel starts burning before TDC and our models fail to capture this phenomenon. The ignition time predicted by the adiabatic model is about 5 degrees earlier than those obtained by experiment and by the non-adiabatic model. The temperature solution from the non-adiabatic model generally agrees with the measurement. Both models predict stronger ignition in the cylinder as indicated by the sharp increases in the temperature profiles. The weaker ignition shown by the experimental data is likely due to temperature variation inside the real cylinder. Although gas composition is homogeneous throughout the cylinder, gas temperature in the core region can be different from that in the boundary layer. The temperature difference can be large if heat loss at the cylinder wall is large. If the gas mixture of the hot core region ignites first, the mean temperature inside the cylinder will not jump as sharply as predicted by the models. Figure 2-29 HCCI Engine—EGR Temperature Comparison RD0411-C20-000-001 53 © 2007 Reaction Design
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Page 3 and 4: Chemkin 4.1.1 Contents Table of Con
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Chapter 3: Catalytic Processes Tuto
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Chemkin 4.1.1 4 4 Materials Problem
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Tutorials Manual 4.1.1 Index Index
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Tutorials Manual

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