Flow conditions are such that the flame cannot be maintained at the burner rim despite the presence of both fuel and oxygen. So, when the fuel jet velocity is further increased, the flame will eventually extinguish at its blowout condition. You need Shockwave Flash to view this page. The air flow around the fuel jet can also significantly alter the liftoff, blowout, and reattachment of the flame. The effects of the air flow on the diffusion flame's stability in normal gravity, however, are often complicated by the presence of buoyant convection.
Buoyant convection is strong enough in normal gravity flames that it dominates the flow field.
In normal gravity testing, it is very difficult to tell the difference between the effects of the forced air flow from those of the buoyancy-induced flow. However, a comparison of normal gravity and microgravity flames provides a clear indication of the influence of forced and buoyant flows on the flame stability.