Rapidly mixed combustion of hydrogen/oxygen diluted by N2 and CO2 in a tubular flame combustor

Response of lean premixed swirl tubular flame to acoustic perturbations

“…This phenomenon is different from the high frequency thermoacoustic oscillation occurred in premixed propane/air tubular flame [5], and partially premixed oxy-methane [18] and hydrogen/air swirl flames [17].…”

“…In the premixed propane/air combustion under large flow rates (over 600 m 3 /h) [5], high frequency oscillations were observed, which were identified as the tangential/radial mode acoustic resonant oscillations. In the hydrogen/air combustion [17] as well as lean oxy-fuel combustion of methane [3,18] and propane [19] under high oxygen concentrations (above 0.6), the observed high frequency oscillations were recognized as the axial mode acoustic resonant oscillations. Such instability phenomena severely limit the application of tubular flame to the aforementioned emission reduction, power generation, and flame synthesis.…”

Effects of CO2 and N2 Dilution on the Combustion Characteristics of H2/CO Mixture in a Turbulent, Partially Premixed Burner

“… , Thus, it is essential and economical to study the effects of CO 2 and N 2 dilution on flames. It has been proved that CO 2 dilution significantly influences the flame speed, flame stability, flame structure, and heat release characteristics of laminar H 2 /CO, H 2 /N 2 , CH 4 /O 2 , and MTHF flames. − The effects of CO 2 dilution on the flame characteristics, flame structure, emissions, temperature, and flame dynamics in turbulent CH 4 /air, CO/H 2 /CO 2 , H 2 /O 2 , and CH 4 /H 2 flames were also discussed. − On the other hand, the impacts of N 2 dilution on the flame characteristics have been analyzed in some investigations and their results were mainly related to the burning velocity, flame stability, flame structure, and flame chemiluminescence in laminar CH 4 /air and H 2 /CO flames. − The addition of CO 2 has effects on the flame structure in H 2 /CO 2 /N 2 and H 2 /O 2 counterflow diffusion flames. , Furthermore, the effects of the stagnation plate, flame temperature, and fuel properties on the combustion characteristics and emissions of diffusion flames were experimentally studied. − In most of the aforementioned studies, the flame structure, flame stability, and flame speed are the most important parameters for the combustion characteristics of CO 2 diluted laminar or turbulent premixed flames and N 2 diluted laminar premixed flames. In a variety of industrial heating applications, the flame temperature, species concentration, and flame length of nonpremixed or partly premixed flames in a turbulent industrial burner are mainly of concern.…”

The behavior of methane/hydrogen/air premixed flame in a closed channel with inhibition

“…Some previous studies on the inhibiting effect of N2 or CO2 for methane/air [31][32][33][34][35], hydrogen/air [36][37][38][39] combustion have been conducted. However, as mentioned before, the mixed fuel would have distinct combustion characteristics, and thus would probably give different response to either N2 or CO2 inhibition.…”