The blending behavior of ethanol in five different hydrocarbon base fuels with octane numbers of approximately 70 and 84 was examined under Spark-Ignited (SI) and Homogeneous Charge Compression Ignited (HCCI) operating conditions. The Blending octane number (BON) was used to characterize the blending behavior on both a volume and molar basis. Previous studies have shown that the blending behavior of ethanol generally follows several well-established rules. In particular, non-linear blending effects are generally observed on a volume basis (i.e. BON > RON or MON of pure ethanol; 108 and 89, respectively), while linear blending effects are generally observed on a molar basis (i.e. BON = RON or MON of pure ethanol). This work firstly demonstrates that the non-linear volumetric blending effects traditionally observed under SI operating conditions are also observed under HCCI operating conditions. In keeping with previous studies, the degree of this non-linearity is shown to be a function of the base fuel composition and octane number. By contrast, the molar blending approach is shown to behave differently depending on the chosen combustion mode, with some non-linearity observed under HCCI operating conditions (i.e. BON ≠ RON or MON of pure ethanol). This suggests that the well-established blending rules for SI operating conditions may not always be relevant to other combustion modes that operate with globally lean or diluted air-fuel mixtures. This has implications for the design of future fuel specifications.


    Access

    Check access

    Check availability in my library

    Order at Subito €


    Export, share and cite



    Title :

    Blending Octane Number of Ethanol on a Volume and Molar Basis in SI and HCCI Combustion Modes


    Additional title:

    Sae Technical Papers



    Conference:

    International Powertrains, Fuels & Lubricants Meeting ; 2017



    Publication date :

    2017-10-08




    Type of media :

    Conference paper


    Type of material :

    Print


    Language :

    English




    Blending Octane Number of Ethanol on a Volume and Molar Basis in SI and HCCI Combustion Modes

    Waqas, Muhammad Umer / Morganti, Kai / Masurier, Jean-Baptiste et al. | British Library Conference Proceedings | 2017


    Blending Octane Number of Ethanol in HCCI, SI and CI Combustion Modes

    Waqas, Muhammad / Naser, Nimal / Sarathy, Mani et al. | British Library Conference Proceedings | 2016


    Blending Octane Number of Ethanol in HCCI, SI and CI Combustion Modes

    Johansson, Bengt / Morganti, Kai / Al-Qurashi, Khalid et al. | SAE Technical Papers | 2016


    Simulating HCCI Blending Octane Number of Primary Reference Fuel with Ethanol

    Johansson, Bengt / Singh, Eshan / Sarathy, Mani et al. | SAE Technical Papers | 2017


    Simulating HCCI Blending Octane Number of Primary Reference Fuel with Ethanol

    Singh, Eshan / Waqas, Muhammad / Johansson, Bengt et al. | British Library Conference Proceedings | 2017