Host: The Japan Society of Mechanical Engineers
Name : [in Japanese]
Date : March 09, 2017 -
The effects of radiative heat loss on the intrinsic instability of premixed flames were investigated numerically based on the Navier-Stokes equation adopting the one-step irreversible chemical reaction, and the visualizations of the behaviors of cellular flames in large domain were simulated. As the radiative heat loss parameter became larger, the amplitude growth rate decreased and the unstable range narrowed either the Lewis number was lower or larger than unity. This is because of the decrease of burning velocity of a planar flame owing to radiative heat loss. The unstable behaviors of cellular flames were strong at low Lewis numbers due to the intense intrinsic instability. In large domain, the lateral movement of flames and overshoot of the temperature distribution became stronger, and division and combination of cells appeared. Moreover, the burning velocities of cellular flames increased with time. The radiative heat loss promoted (demoted) the unstable behaviors of cellular flames at Lewis numbers lower (larger) than unity.
