The effect of spray–flat-wall interaction on the diesel combustion characteristics in a constant-volume vessel was investigated. A flat wall was fixed perpendicular to the nozzle hole axis. Three injection pressures of 100 MPa, 150 MPa and 200 MPa and a single nozzle hole with a diameter of 0.133 mm were employed. Mie scattering was adopted to detect the spray formation process; OH* chemiluminescence and natural colour luminosity were conducted to analyse the combustion process. The two-colour method was applied to calculate the soot emissions and the temperature distribution. The results reveal that, in comparison with a free spray flame, flat-wall impingement causes diesel combustion to deteriorate when the liquid phase–wall interaction occurs; however, when an appropriate impinging distance (longer than liquid-phase penetration) is selected, combustion is observed to be enhanced. As for the impinging spray flame, when the injection pressure is increased, soot formation decreases; however, combustion is not linearly enhanced by increasing the injection pressure, and the OH* chemiluminescence intensity achieves the highest value with an injection pressure of 150 MPa.


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    Title :

    Effect of flat-wall impingement on diesel spray combustion




    Publication date :

    2015




    Type of media :

    Article (Journal)


    Type of material :

    Print


    Language :

    English



    Classification :

    RVK:    ZO 4200 / ZO 4200:
    Local classification TIB:    275/7025
    BKL:    55.20 Straßenfahrzeugtechnik / 55.20



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