gas turbine combustor model - HELP!

Phil

I'm modeling a tubular combustor with swirler& vane passage fuel injection as part of my PhD and I'm having big problems with the combustion model.

For these swirling combustion flows the finite rate/eddy dissipation model is essential but when I use it the flame goes out eventually after around 25 iterations even when having the outer wall at 1500K and patching in the temp of 1300K.

The boundary conditions were worked out by my supervisor and previous theses confirm them. The aerodynamics are spot on but when adding combustion (methane) the flame keeps going out for this model. The eddy dissipation model can be used but combustion occurs where the flow velocity is very high so flame should be quenched. I wrote a UDF to halt reactions > 80,100,120m/s but results are still not great but more sensible.