COHERENT STRUCTURE IN A COMBUSTING JET IN CROSS-FLOW

The name behavior and coherent structure of the combusting propane gas jet in a cross airstream at low jet-to-wind momentum flux ratios are studied experimentally. A one-component constant-temperature hot-wire anemometer is employed to extract frequency information from the trave ling coherent structures evolving from the upwind side of the jet body . The reduced traveling frequency of the coherent structure in the nea r burner reg on is correlated to the jet-to-wind momentum flux ratio. The reduced eddy traveling frequency approaches to a constant of about 0.35 at high jet-to-wind momentum flux ratios. The trajectories of th e traveling coherent structures depicted by the bisector of the eddy t raveling avenue (the narrow band where the coherent structures sweep o ver) are correlated by nondimensional coordinates. The coherent struct ure is found to be profoundly related to the split and nickering pheno mena of the flames in the jet momentum dominant region.