Host: The Japan Society of Mechanical Engineers
Name : [in Japanese]
Date : March 10, 2021 - March 11, 2021
We numerically study the effect of mole production on high-frequency combustion oscillations in a model rocket engine combustor based on an analysis of the budgets of acoustic energy and complex network theory. The extended local Rayleigh index considering mole production allows us to examine the effect of mole production on combustion oscillations. Mole production fluctuations have an effect on damping high-frequency combustion oscillations in the shear layer between the outer hydrogen jet and the inner oxidizer jet. The acoustic energy networks can characterize the complex acoustic energy budgets of a flow field during combustion oscillations. Temporal evolutions of the average vertex strength in the acoustic energy networks can estimate the activity of the acoustic energy transport. The damping sources of the acoustic energy on the mole production term are clearly associated with the driving sources of the acoustic energy on the heat release term during high-frequency combustion oscillations.