Effect of Thermal Conductivity of Tube-Wall on Blow-Off Limit of a Micro-Jet Methane Diffusion Flame

The operating range of the flow rate or velocity for micro-jet flame is quite wide, which can be used as heat source. In order to optimize tube combustor in terms solid material, present paper numerically investigates impact thermal conductivity (λs) on limit flame. Unexpectedly, non-monotonic blow-off limits with increase λs found, and corresponding generation mechanisms are analyzed coupling effect, field, strain effect. At first, lower preheating temperature fuel larger loss amount environment lead a at λs. After that, smaller local vicinity root effect slightly continuously increasing Therefore, it deduced that applied performance better limit.