Abstract 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 ≤ T < 1100 K) of the S-shaped curve, a 4-step model is used to calculate the unstable phase. For the upper branch (T ≥ 1100 K) of the S-shaped curve, onestep model is used because the one-step model has widely been used in descriptions of flame stability where it essentially serves as a model that produces a thin flame with strong temperature sensitivity. When zone temperature T < 1500 K, only the soot precursors -PAHs (Polycyclic aromatic hydrocarbons) is created and there is no soot emission. When zone temperature T ≥ 1500 K, PAHs and soot source terms (particle inception, surface growth, oxidation, coagulation) are calculated. The TP model is then applied in multidimensional simulations to carry out optimizing, which reduces experiment cost. The results of cylinder pressures, the corresponding heat release rates, NOx and soot with variation of injection time at constant rail pressure, variation of EGR-rate at constant rail pressure and variation of rail pressure at constant EGR-rate between simulation and experimental data are analyzed. The results indicate that the TP model can carry out optimization and CFD (computational fluid dynamics) and can be a tool to calculate for a high-pressure common rail diesel engine.


    Access

    Check access

    Check availability in my library

    Order at Subito €


    Export, share and cite



    Title :

    Optimization research for a high pressure common rail diesel engine based on simulation


    Contributors:
    Liu, Y. (author) / Zhang, Y. -T. (author) / Qiu, T. (author) / Ding, X. (author) / Xiong, Q. (author)

    Published in:

    Publication date :

    2010-09-10


    Size :

    12 pages




    Type of media :

    Article (Journal)


    Type of material :

    Electronic Resource


    Language :

    English




    Optimization research for a high pressure common rail diesel engine based on simulation

    Liu, Y. / Zhang, Y. -T. / Qiu, T. et al. | Online Contents | 2010


    Optimization research for a high pressure common rail diesel engine based on simulation

    Liu, Y. / Zhang, Y. T. / Qiu, T. et al. | British Library Online Contents | 2010



    Numerical simulation calculation of fuel system of high-pressure common rail diesel engine

    Wang, Xuejun / Xu, Fangjian / Wang, Yiran | British Library Conference Proceedings | 2022


    Numerical simulation of common rail d.i. diesel engine

    Beatrice, C. / Bertoli, C. / na Migliaccio, M. et al. | SAE Technical Papers | 1999