Oxy-fuel burner for glass forehearths

A burner gas supply apparatus for increasing flame turbulence, the apparatus comprising:

• a conduit having a characteristic width, W, defined by an inner surface having a circumferential direction and an axial direction, the axial direction terminating in a nozzle defining a nozzle exit plane and having a characteristic dimension, d, where d<=W;
• and
• a first bluff body having characteristic dimension, Dbb-1, projecting a length, L1, into the conduit from the inner surface, wherein 0.5<=L1/W<=1, the first bluff body being spaced apart from the nozzle exit plane by an axial distance of X1, wherein X1/Dbb-1<=30;
• and
• a second bluff body having a characteristic dimension, Dbb-2, projecting a length, L2, into the conduit from the inner surface, wherein 0.5<=L2/W<=1, the second bluff body being further in the axial direction from the nozzle exit plane than the first bluff body and spaced apart from the first bluff body by an axial distance of X2, wherein X2/Dbb-2<=30;
• a third bluff body having a characteristic dimension, Dbb-3, projecting a length, L3, into the conduit from the inner surface, wherein 0.5<=L3/W<=1, the third bluff body being further in the axial direction from the nozzle exit plane than the second bluff body and spaced apart from the second bluff body by an axial distance of X3, wherein X3/Dbb-3<=30;
• wherein the first bluff body and the second bluff body are separated in the circumferential direction by a first spacing angle;
• wherein the second bluff body and the third bluff are separated in the circumferential direction by a second spacing angle;
• and
• wherein the first bluff body and the conduit are sized so that a first bluff body Reynolds number, Rebb-1=ρVinletDbb-1/μ, is equal to or greater than 50;
• and
• wherein the nozzle characteristic dimension, d, is sized so that a jet Reynolds number, Rej=ρVjd/μ, is equal to or greater than the first bluff body Reynolds number, Rebb-1.