Abstract
To evaluate the effect of the disturbance airflow on the methane deflagration flame, a deflagration experiment is conducted in a closed duct. The effects of three disturbance airflow levels and two disturbance positions on the deflagration flame dynamics, including the variation of flame propagation behavior, disturbance mechanism, and deflagration overpressure development are investigated. The experimental results show that the vertical disturbance of the airflow disrupts the original structure of the deflagration flame, increasing the inherent instability and turbulence of the flame. The increase in the initial pressure of the disturbance airflow can increase the flame turbulence intensity, propagation velocity, the maximum value of the deflagration overpressure and the rate of overpressure rise. The contribution of the disturbance airflow at the initial acceleration position of the flame to the characteristic parameters of deflagration is more prominent. The experimental results complement and explain the propagation behavior of deflagration flame in a non-static environment. It provides suggestions on the prevention and protection of combustible gas deflagration risks in complex environments.
Published Version
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