Refining the criterial description of flame stabilization during gas jet combustion

Effect of addition of CO2 to the fuel on combustion of gas jets in air

“…To process the data on the influence of CO 2 addition to the fuel on macrokinetic characteristics, such as the characteristic combustion time τ and the normal velocity of flame propagation u n , we used the homochronicity criterion, which is expressed as a dependence Ho(H) obtained in [3]:…”

“…(3), we used the experimentally measured lift-off length H for a given value of β under the assumption that α = 1, which is typical for "ignition" points [3]. The homochronicity criterion for the pure fuel is expressed by the known formula Ho = u 0 τ/d, where u 0 is the velocity of exhaustion of the fuel jet from the nozzle and τ is the characteristic combustion time tabulated in [4] for pure fuels in the form of the dependence τ (α), which takes the minimum value τ min at α ≈ 1 for the given composition and temperature of the mixture.…”

“…1, in contrast to that described in [3], contains an additional mixer of the combustible gas with CO 2 , which is a cylindrical chamber with gas injection through two jet nozzles with a diameter ∅0.2 mm. This size of the nozzles was chosen to ensure a supersonic pressure difference for convenience of controlling the flow rate through each jet nozzle and to obtain intense mixing of gases ahead of the main nozzle.…”

“…In our previous paper [3], we demonstrated that the correctness of organization of flows, even for jets escaping into the ambient space with no cocurrent flow, is an extremely important factor.…”