High velocity error
 

I am trying to study spray charactersitics from a nozzle using phoenics ( similar to gas turbine combustion chamber set-up). Using KE Turbulence model, I am getting velocity in the region of 54000m/s. I know it is incorrect as I am expecting to see something in the region of 10-25 m/s (velocity at exit of nozzle).

Initially i was not getting convergence, but this was resolved by tweaking SARAH. start from ambient is off, and I have given pressure=500 psi and tem=120 deg c as initialisation. still the velocity is high. I am kind-of run out of ideas.

any ideas or suggestions are much appreciated. Thanks.

Nozzle exit dia=0.00044m
Nozzle Inlet dia=0.00762m
mass flow rate at fuel inlet=2.9kg/s
density of fuel=750kg/m3
temp of fuel=120 deg c

Air inlet mass flow rate=10kg/s
temp of air=400 deg C
density of air=0.5 kg/m3

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