Help: LDO injection
 

I have rectangular combustion chamber whoich is fully insulated. I want to carry out non-premixed combustion using LDO as the fuel.I have give air and fuel velocity in the boundary conditions as 6.8 and 34.34 m/sec.In the injection also I have give velocity as 34.34m/sec and fuel oil liquid is taken as the droplet particle havingf the diameter of 0.0003m.the radiation model selected is P1.I want to know whether to give same velocity in the injection and fuel_in boundary condition.With the conditions given above i am not getting converged solution and the temperature distribution is also not proper. Please help me to slve this problem. Thanking you.