Flame tube and combustion chamber questions

[witek]

Hi guys,

Is there any advantage to having a vented type combustion chamber? By this I mean the flame tube ends in the combustion chamber and is not sealed at the outlet side.
From my understanding this would increase the amount of air flow to the turbine and cool it, rather than have it flow through the combustion chamber and ignite.

I have included a section view of my current chamber design to illustrate what I mean. Disregard the hole pattern for now as at this moment it is simply there for visual purposes.




Thanks,

witek

[enginewhisperer]

you would need to count that area as part of your tertiary flame tube holes - but the air will tend to stick to the walls of the turbine scroll so you potentially won't get proper dilution and cooling of all the gases (the scroll will stay cooler but the hotter gases at the core might make it all the way to the turbine wheel).

[racket]

Yep , those combustors with a gap at the bottom are very old designs , much better to have all air going through the wall holes where the flow can be controlled and regulated accordingly .

Combustion should be completed before mid point down the flametube , the bottom half is for dilution

Cheers
John