| OPTIMIZATION RESEARCH FOR A HIGH PRESSURE COMMON RAIL DIESEL ENGINE BASED ON SIMULATION |
| Y. LIU1, Y.-T. ZHANG2, T. QIU2, X. DING2, Q. XIONG2 |
1Beijing University
2Beijing Institute of Technology |
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| ABSTRACT |
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A TP (Temperature Phase) model is presented to carry out optimization calculation for a high-pressure common rail diesel engine. Temperature is the most important parameter in the TP model. For the lower branch (when temperature T < 850 K) of the S-shaped curve (auto-ignition phase), a 6-step ad-hoc model with adjusted rate constants of nheptane is used, referred to steady state assumption. Steady state assumption is based on the observation that, due to very fast chemical processes in combustion problems, many chemical species and reactions are in a quasi-steady state or partial equilibrium. When a species is assumed to be in the steady state, the corresponding differential equation can be replaced by an algebraic relation, which reduces the computational costs. For the middle branch (850 K |
| Key Words:
High-pressure common rail diesel engine, Polycyclic aromatic hydrocarbons (PAHs), Temperature phase model, Optimization calculation |
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