Wren 80i Miniature Gas Turbine combustion chamber query

[tobycmay]

I am trying to work out what the tubes indicated in the picture attached do. My thoughts are that the fuel flows through them to vaporise into gas before combustion so it is at a more optimal temperature.  Where does the fuel flow and where does it ignite? If anyone could explain i would be grateful. 
thanks 
imagine link

ibb.co/i6X7V6

[BFTO]

The tubes is evaporator tubes. The fuel is going into the fuel manifold in the top off the picture. Syringe needles is silver soldered to the manifold and spraying fuel into the evaporator tubes.  

[smithy1]

Pretty common for a lot of RC turbines...

Smithy.