Experimental investigation of the stability and emission characteristics of premixed formic acid-methane-air flames in a swirl combustor

Zhu, Xuren; Wang, Shixing; Elbaz, Ayman M.; Younes, Mourad; Jamal, Aqil; Guiberti, Thibault F.; Roberts, William L.

doi:10.1016/j.ijhydene.2022.11.193

Cited by 2 publications

(1 citation statement)

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“…Additionally, the increase of swirl blade angle enhances the preheating effect, enlarges the recirculation zone in the combustion chamber, and stabilizes the flame at high inlet flow rates. Zhu et al 10 investigated the impact of flame stability and pollutant emission characteristics in a premixed swirl combustion chamber, the premixed formic acid-methane-air flames could be stabilized over a wide range of Fa fuel fractions, Reynolds numbers, and swirl numbers. The swirl number has a non-monotonous effect on the flashback and lean blowout limits.…”

Section: Introductionmentioning

confidence: 99%

Analysis of vortex combustion flow in a chamber of guide ring coupling with swirl flow

Sun,

Zeng,

2023

Proceedings of the Institution of Mechanical Engineers, Part A:

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To investigate the impact of different vortex structure on the combustion stability in a chamber, this paper evaluates the performance of a vortex combustion chamber coupled with a swirler and a guide ring. The simulated cases include different guide ring angles of 95°, 105°, 115°, 125° and 135°, in addition to a control case without coupling the guide ring. The distributions of velocity, vorticity, temperature, outlet temperature distribution factor ( OTDF), reaction rate, turbulent kinetic energy ( k), synergy angle ( β), and NO emission are numerically analyzed. Results show that the coupling of the swirler and guide ring changes the vortex structure and significantly influences the chamber performance. The increase of the guide ring angles ( α) enhances the interaction between the swirl flow and the direct jet, which intensifies heat and mass transfer, as well as turbulence. The application of the guide ring induces external entrainment of the jet, leading to the formation of a large central recirculation zone compared to that without a guide ring. With increasing the α from 95° to 135°, both average outlet velocity and tangential velocity ( Vt) at the coaxial line position decrease, while the flame length decreases by 286 mm. And the OTDF variation among all cases is less than 0.065. The β of the central section decreases from 76.18° to 70.17°. Furthermore, combustion chamber without the guide ring exhibits higher temperature and OTDF.

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Section: Introductionmentioning

confidence: 99%