{{Short description|Engine part}} thumb|right|250px| thumb|right|250px| thumb|right|250px| A '''flame holder''' is a specialized baffle mounted in a high-velocity combustible flow, such as within the combustion section of a jet engine, to create a local region of turbulence and low velocity in which a flame can remain stable.<ref>The Cambridge Aerospace Dictionary,Bill Gunston 2004, Editor, Jane’s Information Group,{{ISBN|978-0-511-33833-5}}</ref>

Jet engine afterburners and ramjets require a flame holder.<ref>{{cite book | chapter-url=https://link.springer.com/chapter/10.1007/978-3-030-66881-5_6 | doi=10.1007/978-3-030-66881-5_6 | chapter=Flameholder Design Guidelines | title=Subsonic Combustion Ramjet Design | series=SpringerBriefs in Applied Sciences and Technology | date=2021 | last1=Ingenito | first1=Antonella | pages=47–74 | isbn=978-3-030-66880-8 }}</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>{{Cite web |title=Wayback Machine |url=https://www.ijser.org/researchpaper/Temperature-Prediction-and-Validation-of-V-Gutter-for-an-Aeroengine-Afterburner.pdf |archive-url=https://web.archive.org/web/20210501151216/https://www.ijser.org/researchpaper/Temperature-Prediction-and-Validation-of-V-Gutter-for-an-Aeroengine-Afterburner.pdf |archive-date=2021-05-01 |access-date=2025-09-09 |website=www.ijser.org |url-status=live }}</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>{{Cite journal | last1 = Matkowsky | first1 = B. J. | last2 = Olagunju | first2 = D. O. | year = 1981 | title = Pulsations in a Burner-Stabilized Premixed Plane Flame | journal = SIAM Journal on Applied Mathematics | volume = 40 | number = 3 | pages = 551–562 | jstor = 2101350 | doi=10.1137/0140046}} See p.&nbsp;552.</ref>

==See also== *Index of aviation articles *AVPIN - A monofuel used to power turbojet starter motors. *Components of jet engines *Exhaust mixer

==References== {{Reflist}}

==External links== {{commonscat|Flame holders}} *[https://taylorandfrancis.com/knowledge/Engineering_and_technology/Aerospace_engineering/Flame_holder/] *[https://aeronotes.weebly.com/flame-holders.html] *[https://aerospacenotes.com/propulsion-1/flame-holder/] *[https://www.dvidshub.net/image/757230/two-ring-semi-swedish-flameholder-afterburner-mounted-j-47-17-engine] *[https://www.researchgate.net/figure/Rear-view-of-the-new-radial-flameholder-system-installed_fig9_235752050] *[https://auto.howstuffworks.com/under-the-hood/trends-innovations/rotating-detonation-engine.htm] *[https://patents.google.com/patent/US7712315B2/en]

{{Aircraft gas turbine engine components}}

{{DEFAULTSORT:Flame Holder}} Category:Jet engines

{{Engine-aircraft-stub}}