Flame stabilization using large flameholders of irregular shape

Stwalley, Robert M.; Lefebvre, A. H.

doi:10.2514/3.23025

Cited by 23 publications

(2 citation statements)

References 3 publications

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“…Various optimized designs appeared to enhance the fuel–air mixing process. These include using irregular edges to strengthen the fuel–air interaction in the shear layers , or applying the partitioned combustion concept to create an isolated ″pilot combustion stage″. The latter method leads to pilot flameholders with a significantly enhanced ignition performance, especially under extreme conditions such as high inlet velocities and subatmospheric pressures.…”

Section: Introductionmentioning

confidence: 99%

Partially Premixed Ignition for a Bluff-Body Flameholder under Various Igniter and Inlet Conditions

Zhang

2021

ACS Omega

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This study applies experimental methods to investigate the partially premixed ignition characteristics of a bluff-body flameholder with a pilot stage. The ignition fuel–air ratio (FAR) under different igniter and inlet conditions is obtained, while the ignition process is recorded with a high-speed photography device. Numerical simulations are carried out to investigate the relationship between the flow field, fuel distribution, and ignition process. The results show that a higher total capacitance energy storage of the igniter, inlet Mach number, or total pressure inside the combustion chamber will help increase the ignition performance, accelerate the development of the flame, and shorten the ignition delay. The flame propagation routine of the flameholder is controlled by several pairs of symmetrical recirculation zones behind the flameholder structure and the specific uneven fuel distribution caused by the flow field. This study provides a detailed understanding of the ignition process for the bluff-body flameholder.

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Section: Introductionmentioning

confidence: 99%

Partially Premixed Ignition for a Bluff-Body Flameholder under Various Igniter and Inlet Conditions

Zhang

2021

ACS Omega

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“…In 1988 Stwalley and Lefebvre conducted research on "irregular"-shaped flame holders. 15 In this research, slots and notches were cut in the flame holders to affect vortex shedding in their wake. This research is similar to that recently conducted by Kim et al 16,17 Stwalley and Lefebvre found that unless the flame-holder treatment had a significant influence on the wake of the bluff body, no appreciable impact on the extinction was observed.…”

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confidence: 99%