Abstract
Understanding the effect of air injection strategies and burner configuration on flame stability is essential for preventing blowoff in premixed swirl combustion systems. This experimental study investigates the blowoff limits of liquefied petroleum gas (LPG) flames in tangential swirl burners with two different geometries,namely two-inlet and three-inlet designs, while maintaining the same geometric swirl number and swirl strength. Two air injection strategies were examined:axial air injection which introduced through the burner base plate,and an air curtain system supplied through the inner circumference of the burners nozzle. Blowoff limits were recorded over a wide range of operating conditions to quantify the stabilizing effects of swirl generation and aerodynamics within the near field-region of the flame. The results showed that the three inlet burner consistently exhibited higher resistance to blowoff compared with the two-inlet reference configuration for both air injection techniques. The improved performance of the three-inlet burner is attributed to its enhanced azimuthal momentum distribution, stronger central recirculation zone, and more uniform mixing field,which collectively contribute to stabilize the flame at the nozzle exit.Furthermore,both axial air injection and air curtain strategies were found to extend blowoff limits,with the three inlet geometry demonstrating the most pronounced stabilizing effect
First Page
49
Last Page
55
Recommended Citation
Janna, Haidar Ali; Aldulaimi, Zaid; and Alfahham, Mohammed
(2026)
"Effects of Air Injection Styles and Burner Geometry on Blowoff in Premixed Swirl Flame,"
The Nexus of Sustainability and Energy Technology Journal: Vol. 2:
Iss.
1, Article 4.
DOI: https://doi.org/10.63100/3080-1915.1013