In the present paper

the effect of solid material on the blow-off limit of a micro-combustor was numerically investigated. For the three solid materials selected

i.e.

quartz

stainless steel

and SiC

the corresponding blow-off limits obtained for the three combustors are 36

25 and 21 m·s-1. The underlying mechanisms are analyzed in terms of the interactions between heat transfer

flow field and flame stabilization. It is revealed that for small thermal conductivity (i.e.

quartz)

less heat is conducted to upstream walls

the fresh mixture is not sufficiently preheated

and the gas volume does not expand so significantly

leading to a larger "low velocity zone" and thus a higher blow-off limit. For the other two materials with higher thermal conductivities (i.e.

stainless steel and SiC)

higher thermal emissivity (i.e.

SiC) results in higher "total heat loss ratio" and lower blow-off limit. It can be concluded that the solid material with a relatively low thermal conductivity and emissivity is beneficial to obtain higher blow-off limit for the micro bluff body combustor.