Flame holder
A flame holder is a component of a jet engine used as an ignitor to help maintain continual combustion.<ref>https://www.researchgate.net/figure/An-aircraft-jet-engine_fig2_4205809</ref> In a scramjet engine the residence time of the fuel is very low and complete penetration of the fuel into the flow will not occur.<ref>https://patents.google.com/patent/US7954328B2/en</ref> To avoid these conditions flame holders are used.<ref>{{#invoke:citation/CS1|citation |CitationClass=web }}</ref>
All continuous-combustion jet engines require a flame holder.<ref>https://link.springer.com/chapter/10.1007/978-3-030-66881-5_6</ref> A flame holder creates a low-speed eddy in the engine to prevent the flame from being blown out.<ref>http://www.topedge.com/panels/aircraft/sites/mats/f14-detail-engine.htm</ref> The design of the flame holder is an issue of balance between a stable eddy and drag.<ref>https://blog.partsbase.com/afterburner-components/</ref>
The simplest design, often used in amateur projects, is the can-type flame holder, which consists of a can covered in small holes. Much more effective is the H-gutter flame holder, which is shaped like a letter H with a curve facing and opposing the flow of air. Even more effective, however, is the V-gutter flame holder, which is shaped like a V with the point in the direction facing the flow of air. Some studies have suggested that adding a small amount of base bleed to a V-gutter helps reduce drag without reducing effectiveness.<ref>https://www.ijser.org/researchpaper/Temperature-Prediction-and-Validation-of-V-Gutter-for-an-Aeroengine-Afterburner.pdf</ref> The most effective of the flame holders are the step type flame holder and the strut type flame holder.
The first mathematical model of a flame holder was proposed in 1953.<ref>Template:Cite journal See p. 552.</ref>
See alsoEdit
- Index of aviation articles
- AVPIN - A monofuel used to power turbojet starter motors.
- Components of jet engines
- Exhaust mixer