Reacting and Non-Reacting Flow Fields on a V-Gutter Stabilized Flame

Scott Bush, Ephraim Gutmark
2006 44th AIAA Aerospace Sciences Meeting and Exhibit   unpublished
Particle Imaging Velocimetry (PIV) measurements have been performed to determine the flow field around a confined V-gutter bluff body in both non-reacting and reacting environments. The PIV measurements capture instantaneous and mean flow structures formed in the wake region of a three dimensional bluff body. In addition to the flow structures, the mean velocity components, mean out of plane vorticity, and the turbulent kinetic energy have been compared between the non-reacting and reacting
more » ... ng and reacting test cases. The results show significant differences in the instantaneous flow structures. The non-reacting case results in asymmetric shedding of large scale vortical structures that span the entire wake region while the reacting case results in both symmetric and asymmetric shedding of smaller scale vortical structures that are flattened out within the shear layer. A comparison of the mean velocity components clearly shows that the reacting case results in a larger region of reversed flow, experiences an acceleration of the freestream flow due to combustion, and results in a slower dissipation of the wake region. Nomenclature V x ,V y ,V z = mean streamwise, transverse, and spanwise velocity components v' x ,v' y ,v' z = fluctuating streamwise, transverse, and spanwise velocity components V b = bulk velocity: ω z = vorticity about the z-axis TKE = turbulent kinetic energy: D = V-gutter width T in = inlet temperature P s = static pressure Φ = equivalence ratio
doi:10.2514/6.2006-807 fatcat:fc7q7qptyffwhjowhl5rhc5oea