Plasma-assisted stabilization of premixed swirl flames by gliding arc discharges

Stabilization and Emission Characteristics of Gliding Arc-Assisted NH3/CH4/Air Premixed Flames in a Swirl Combustor

“…The formation of the GA-induced flame kernel and its propagation were expatiated in our previous studies . Consequently, the high-frequency repetitive ignition of the lean PSF contributes to a dramatic extension of the LBO limit. , Detailed effects of GA discharge on flame and flow structures are further exploited by optical measurements.…”

“…The broadened IRZ and enhanced reaction zone were also observed in previous study on GA-assisted methane flames. The combustion enhancement can be attributed to a strong non-linear coupling between the plasma and the turbulent flame . Apart from the effects on kinetics and the flow field, the thermal channel of GA was previously reported to have a less significant effect on the stabilization but a prominent effect on the ignition .…”

“…As illustrated in Figure , a dichroic mirror prior to the sheet-forming optics is used to spatially overlap the 283 nm beam from a dye laser (Cobra-Stretch) operated at 5 Hz for OH-PLIF and the 532 nm beam from a continuous-wave laser (MGL-W, 18 W) for PIV, allowing the simultaneous OH-PLIF/PIV measurements. The detailed descriptions are available in our previous work . OH-PLIF images are captured using an intensified charge-coupled device (ICCD, PIMAX-IV, 1024 × 1024 pixels) camera equipped with a 307 ± 10 nm filter and PIV images using a high-speed camera (Phantom v311, 1024 × 1024 pixels) at a frame rate of 4200 fps and an exposure time of 50 μs.…”

“…As an ideal intermediate between thermal and non-thermal plasmas, the GA discharge possesses not only a relatively high plasma density but also high electron temperature and chemical selectivity . We have found that the GA discharge significantly extended the LBO limits of methane flames. , More recently, it was used to stabilize pure ammonia flames. , Aiming at the future practical use of PAC for NH 3 /CH 4 mixtures, the GA performance on the premixed swirl flames (PSFs), which is an important feature in modern combustors, needs to be thoroughly illustrated.…”

Plasma Effects on Swirl Flames in a Scaled Dry Low Emission Burner

“…In the work by He et al [23], the effect of RGA on combustion efficiency in a swirling combustor was studied, and the combustion efficiency was found to be improved by the plasma-assisted combustion as compared with that in the normal conditions. Sun et al [24] used air and methane in a swirl burner with a cone-shaped bluff body to demonstrate an extension of the lean blowout limit by 38%. They also showed that this improvement can be even larger, up to 60%, for pulsating flames.…”