Exploring a critical diameter for thermo-acoustic instability of downward propagating flames in tubes

Effect of flame surface area of downward propagating flames induced by single and double laser irradiation on transition to parametric instability

“…However, pressure coupling can also be important when flame area does not change during flame propagation [8]. A critical diameter was also found at which the stronger parametric instability can be generated in mixtures with lowest laminar burning velocity [8]. The higher acoustic modes of the parametric instability can also be generated in gaseous fuels which has been experimentally and theoretically studied [9].…”

“…Dubey et al [7] analytically and experimentally studied the effect of geometric parameters on thermo-acoustic instabilities and found that velocity coupling mechanism is the dominant mechanism. However, pressure coupling can also be important when flame area does not change during flame propagation [8]. A critical diameter was also found at which the stronger parametric instability can be generated in mixtures with lowest laminar burning velocity [8].…”

“…Stability diagram at SL =16 cm/s for C2H4/O2/CO2 mixture with Le = 1.05. 8. Acoustic pressure fluctuation in the tube during flame propagation under various conditions (mixture compositions are given in Table 1).…”