Ignition-delay times of syngas mixtures ( H 2 / CO / O 2 / Ar ) were measured using a shock tube in the following conditions: temperatures of 910–1290 K, pressures of approximately 1.0 atm, an equivalence ratio of 1.0, H 2 : CO ratios of 0.25 and 4.0, and especially Ar dilution rates of 94% and 79%. Simulating results and sensitivity analysis show that Davis Mech, NUIG Mech, and Varga Mech have more accurate computational results than GRI 3.0, SD Mech, and Li Mech at around 1000 K because for reaction H + O 2 ( + Ar ) = HO 2 ( + Ar ) the former three mechanisms have a lower reaction rate. Oxidation of H 2 occurs mainly through reactions O + H 2 = H + OH and OH + H 2 = H + H 2 O , whereas CO + OH = CO 2 + H is the dominant reaction for the oxidation of CO. Comparative analyses of syngas with the same H 2 : CO ratio at 94% and 79% Ar dilution rates show that heat absorption of Ar during combustion is the main cause of long ignition-delay time, although Ar also inhibits the reactivity of syngas through H + O 2 ( + Ar ) = HO 2 ( + Ar ) at 1000 K. Moreover, the pressure response curve rises slowly with 94% Ar dilution but sharply with 79% Ar dilution under low-temperature conditions, and detonation (or deflagration to detonation) can be observed under such conditions. In addition, OH * emission was observed behind the incident shock wave when its velocity reached 1200    m / s with 79% Ar dilution, and it was unable to measure ignition-delay time behind the reflected shock wave.


    Access

    Check access

    Check availability in my library

    Order at Subito €


    Export, share and cite



    Title :

    Shock Tube Study of Ignition-Delay Measurements and Kinetic Mechanism Research for Syngas


    Contributors:
    He, Dong (author) / Ding, Yanjun (author) / Xiong, Xiaohe (author) / Shi, Shuo (author) / Du, Yanjun (author) / Peng, Zhimin (author) / Yan, Weiping (author)

    Published in:

    Publication date :

    2018-04-30


    Size :

    8 pages




    Type of media :

    Article (Journal)


    Type of material :

    Electronic Resource


    Language :

    English




    To Study on Ignition Characteristics of Syngas Mixtures by Shock Tube

    Dinh Thi, Luong / Nguyen Hoang, Vu / Huang, ZuoHua | SAE Technical Papers | 2013


    A SHOCK TUBE EXPERIMENTAL STUDY AND KINETIC MODELING OF M-XYLENE IGNITION DELAY

    Saxena, S. / Flora, G. / Kahandawala, M. et al. | British Library Conference Proceedings | 2011


    A Shock Tube Experimental Study and Kinetic Modeling of M-xylene Ignition Delay

    Saxena, Saumitra / Flora, Giacomo / Kahandawala, Moshan et al. | AIAA | 2011



    Shock Tube Measurements of Jet and Rocket Fuel Ignition Delay Times

    Davidson, David F. / Shao, Jiankun / Parise, Thomas et al. | AIAA | 2017