Ignition-delay times of syngas mixtures () 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, 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 the former three mechanisms have a lower reaction rate. Oxidation of occurs mainly through reactions and , whereas is the dominant reaction for the oxidation of CO. Comparative analyses of syngas with the same 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 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, emission was observed behind the incident shock wave when its velocity reached with 79% Ar dilution, and it was unable to measure ignition-delay time behind the reflected shock wave.
Shock Tube Study of Ignition-Delay Measurements and Kinetic Mechanism Research for Syngas
Journal of Propulsion and Power ; 34 , 4 ; 836-843
2018-04-30
8 pages
Article (Journal)
Electronic Resource
English
To Study on Ignition Characteristics of Syngas Mixtures by Shock Tube
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