THERMAL SCIENCE

International Scientific Journal

Thermal Science - Online First

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The joint influence of the hydrogen additions and the opening ratios on the propagation dynamics of premixed syngas/air flame

ABSTRACT
To further understand the combustion characteristics of syngas/air, the behaviors of premixed flame at various hydrogen additions and opening ratios were investigated. The combustion vessel is a half-open rectangular duct 50mm square by 900mm long. The shape of the flame is photographed by a high-speed camera and the pressure is measured by a pressure sensor at the closed end of the duct. The effect of the two variables on the flame dynamics are considered through the analysis of the flame shape evolution and the overpressure oscillation. The results show that the tulip flame appeared earlier and the overpressure peak reach the maximum under the condition of 30% hydrogen fraction; with increasing of the opening ratio, the tulip flame appeared later and the overpressure peak gradually decreased. Under the experimental conditions of the opening with the increase of the volumes of hydrogen blend ratio, the overpressure peak increased systematically, but the occurrence time fluctuated. The results show that the influence of the opening ratio and the hydrogen blend ratio pressures is mainly impacted when the hydrogen blend ratio is at least 30%,with a 0.25 opening ratio. At these critical parameters, the overpressure peak reaches a maximum of 0.9bar;when the opening ratio is 0.5, the overpressure peak suddenly dropped to 0.39bar.
KEYWORDS
PAPER SUBMITTED: 2021-05-03
PAPER REVISED: 2021-06-14
PAPER ACCEPTED: 2021-06-26
PUBLISHED ONLINE: 2021-09-04
DOI REFERENCE: https://doi.org/10.2298/TSCI210503260D
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