MadSci Network: Engineering

Subject: What does a flame holder do in a ramjet engine?

Date: Thu Oct 12 18:48:17 2000
Posted by Elliot Leon
Grade level: 10-12 School: Santa Clara High School
City: Santa Clara State/Province: CA Country: USA
Area of science: Engineering
ID: 971390897.Eg

I have read about ramjet engines and am currently designing one for use on 
a "round-the-world rocket."  A ramjet is the best engine I have though 
of.  They are fast, simple, use normal fuels, air-breathing, and can be 
small but effective.  I have read about ramjets having a "flame holder"  
but haven't found anything as to what exactly it is supposed to do.  This 
is the last step in my design.  Obviously I can't design one if I have no 
idea what it is meant to do.  So the question is, "what exactly is the 
flame holder supposed to do?"  I have read some places where all 
it "seems" to do is mix the fuel but their drawing is just a tube with a 
bunch of holes.  If it's meant to mix the air, wouldn't a series of fins 
cross weaving do better to mix the fuel?  If there is anything I'm leaving 
out, please let me know.  Thank you for any help you can provide.


Re: What does a flame holder do in a ramjet engine?

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