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    Combustion Kinetic Studies of Gasolines and Surrogates

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    Tamour_Javed_PhD_Dissertationv9.pdf
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    Dissertation_Tamour Javed
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    Type
    Dissertation
    Authors
    Javed, Tamour cc
    Advisors
    Farooq, Aamir cc
    Committee members
    Roberts, William L. cc
    Sarathy, Mani cc
    Knio, Omar cc
    Chaumeix, Nabiha
    Program
    Mechanical Engineering
    KAUST Department
    Physical Science and Engineering (PSE) Division
    Date
    2016-11
    Permanent link to this record
    http://hdl.handle.net/10754/621837
    
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    Abstract
    Future thrusts for gasoline engine development can be broadly summarized into two categories: (i) efficiency improvements in conventional spark ignition engines, and (ii) development of advance compression ignition (ACI) concepts. Efficiency improvements in conventional spark ignition engines requires downsizing (and turbocharging) which may be achieved by using high octane gasolines, whereas, low octane gasolines fuels are anticipated for ACI concepts. The current work provides the essential combustion kinetic data, targeting both thrusts, that is needed to develop high fidelity gasoline surrogate mechanisms and surrogate complexity guidelines. Ignition delay times of a wide range of certified gasolines and surrogates are reported here. These measurements were performed in shock tubes and rapid compression machines over a wide range of experimental conditions (650 – 1250 K, 10 – 40 bar) relevant to internal combustion engines. Using the measured the data and chemical kinetic analyses, the surrogate complexity requirements for these gasolines in homogeneous environments are specified. For the discussions presented here, gasolines are classified into three categories: (i) Low octane gasolines including Saudi Aramco’s light naphtha fuel (anti-knock index, AKI = (RON + MON)/2 = 64; Sensitivity (S) = RON – MON = 1), certified FACE (Fuels for Advanced Combustion Engines) gasoline I and J (AKI ~ 70, S = 0.7 and 3 respectively), and their Primary Reference Fuels (PRF, mixtures of n-heptane and iso-octane) and multi-component surrogates. (ii) Mid octane gasolines including FACE A and C (AKI ~ 84, S ~ 0 and 1 respectively) and their PRF surrogates. Laser absorption measurements of intermediate and product species formed during gasoline/surrogate oxidation are also reported. (iii) A wide range of n-heptane/iso-octane/toluene (TPRF) blends to adequately represent the octane and sensitivity requirements of high octane gasolines including FACE gasoline F and G (AKI ~ 91, S = 5.6 and 11 respectively) and certified Haltermann (AKI ~ 87, S = 7.6) and Coryton (AKI ~ 92, S = 10.9) gasolines. To assess conditions where shock tubes may not be ideal devices for ignition delay measurements, this work also presents a detailed discussion on shock tube pre-ignition affected ignition data and the ignition regimes in homogeneous environments. The shock tube studies on pre-ignition and associated bulk ignition advance may help engines research community understand and control super-knock events.
    Citation
    Javed, T. (2016). Combustion Kinetic Studies of Gasolines and Surrogates. KAUST Research Repository. https://doi.org/10.25781/KAUST-HE6A0
    DOI
    10.25781/KAUST-HE6A0
    ae974a485f413a2113503eed53cd6c53
    10.25781/KAUST-HE6A0
    Scopus Count
    Collections
    Dissertations; Dissertations; Physical Science and Engineering (PSE) Division; Mechanical Engineering Program

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